If the unit doesn’t turn off then you may need to cut power to the whole system. Do not try to fix this problem on your own. Is your blower turning on/off constantly during a heating cycle? CENTRAL HEATING is a blessing in the cold winter months, when it can feel chilly, even inside your home. If so, it’s most likely caused by. Previously, our thermostat was keeping your boiler on until your home reached the right temperature. 7. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The whole idea of a thermostat is to turn the boiler on and off, to regulate the heat. Step 2 – Check Your Thermostat if Your Furnace Keeps Turning On and Off Repeatedly Touching the WHITE wire to the RED wire will turn your furnace on without the thermostat. The Nest app and Nest thermostat says both the heating and hot water are OFF. YOU CAN ALSO REPLACE THE RELAY!! Now, let’s look at what’s causing your blower to “misbehave” in both of these situations…. Created by Rocket Media, Minneapolis Saint Paul Plumbing Heating Air, letting a professional repair or replace the switch, The Scary Way Your Furnace Could Start a House Fire (and How to Prevent It), Ductwork that is leaky or designed poorly, Abnormally low temperatures in the heat exchanger, Abnormally high temperatures in the heat exchanger. Both thermostats are turned off. Faulty Thermostat. If you call for cooling, furnace should engage since … If is designed to do this (I forget the reason, possibly something about keeping the pump working?). The boiler is heating up well and working without any issues. The nest thermostat generation 3 is not turning the boiler on after reaching certain temperature. What is currently happening is the gas turns off as soon as the furnace reaches the set temp but the main fan does not stop. Thanks for posting. It makes sense, then, that you’d have temperature controls for each of these two functions. A clogged filter limits the amount of cool air that passes over the heat exchanger, causing it to overheat and shut off. 2. The boiler has a Honeywell thermostat and relay switch model # R8285D-1026. When the boiler comes on in the morning, the radiators het hot and the temperature quickly reaches 20 degrees (one degree lower than that set on thermostat). But first, let’s take a quick look at how your furnace blower works in normal operation to determine whether you actually have a problem or not. A probe inside the switch monitors the temperature of the burner assembly to turn the fan on once the burners are hot and turns the fan off once the burners cool down (when the thermostat stops calling for heat). When it cannot sense that burner, the furnace runs then shuts off and starts again. I don't know if this will help or not. Your blower should run constantly until the heating cycle ends. Unless you’re familiar with the components of your fan limit switch and how it works, we suggest letting a professional repair or replace the switch. Diagnose & fix heat that won't turn off when it should: here we discuss various causes of too much heat or of a heating system that does not shut off whenit should. You turn the dial until it is set to the correct time and then leave it to switch on and off. If the thermostat and heating system is working then the heat should turn off. This is why a ‘boiler thermostat’ essentially encompasses two sub-thermostats. So, if your air filter looks like the one to the right, replace it immediately and see if that fixes the problem. Minneapolis Saint Paul Plumbing Heating Air If the boiler is producing more heat than the rads can use, it will turn off until the water has cooled down. If your thermostat has broken, your boiler will not be able to recognise the temperature of the water, and it will shut itself off in order to prevent the appliance from overheating or because it assumes it has already reached the required temperature. But, it’s a common problem that occurs in a domestic boiler unit. It just keeps blowing air constantly. Thermostats are temperature-sensitive switches that turn the boiler on when heat is required in either the hot water tank or the living space. The next thing you’ll want to do is check the furnace air filter. Either the room thermostat or the water cylinder thermostat calls for heat when the boiler turns on. If the furnace allows room temperature to drop too low or rise too high before the furnace goes on or off, move the lever one mark away. Your IP: 119.73.225.156 Please enable Cookies and reload the page. Doing it with the switch, however, is a truly stone age way to operate. If you’ve got a gas furnace, make sure that your gas supply valve is open. Even though it's in Dutch, this is the official manual of the boiler system. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: Turning your boiler off at night might seem like common sense, but if you’re doing it for economic reasons, read this first – you might not be saving much money at all. Leaking. I had a poke about with the multimeter today. Is your blower turning on/off when your furnace isn’t heating? Two settings that you’ll want to check are: 1) The fan setting. There are many reasons why your furnace might not be kicking on. The boiler will then continue to cycle on/off every 5 minutes until I either push the reset button on the relay box or turn the boiler off then on again. Similar to a clogged filter, dirt on the blades of the air handler fan will decrease cold airflow over the heat exchangers, resulting in the same blower on/blower off pattern. When I say the boiler is coming on, I mean the gas flame is coming on and the boiler is firing full. When the weather is cold you need your boiler thermostat to be set to a high level to make sure your house can get warm enough. Just installed a non programmable thermostat it’s 120v electric, When I turn on at 78degrees for the night, the thermostat cut On and Off throughout the Night, what setting does the thermostat need to be on to something that it won’t shut off, Auto or Heat , … 3. Check for a dirty air handler blower fan. You will need to replace your thermostat – you could save money by purchasing a newer thermostat, as this may reduce your energy bills in the long-term. At that point, the furnace should kick in. I have baseboard heater hot water super boiler it works super fine when thermostat is on. Check to ensure that your thermostat is installed in the proper location—away from outside doors and windows and heat sources such as fireplaces and radiant heaters. At the same time, your blower turns on to help cool it down. Right now, you don't have a boiler aquastat to do that so the boiler fires up and does not turn off until the steam heat pressuretrol tells it that steam has come up to pressure (the house is heating). RV furnace keeps turning off. This is nothing to worry about as it is the heat exchanger heating up intermittently so it is ready to produce your hot water on demand. This vital component is designed to keep an eye on the gas burner. The boiler turns on even when it is shut off at the thermostats. ... which enables you to programme your boiler to turn on at specific times in the day. This morning I turned the Nest heat mode to Eco and the water to off (so the boiler should be off and not heating anything) - the boiler is still cycling between on and off. I have a gas boiler, and it keeps the water in the boiler at a certain temp, regardless of calls for heat from the thermostat (which kicks the circulator pump on.) Any ideas what's wrong please? By playing with the wiring of the boiler I can achieve two things easily: 1. If your thermostat is placed close to a heat source such as direct sunlight or a heat register, it will skew the temperature reading causing the thermostat to turn on and off irregularly. Boiler not responding to thermostat; Gurgling, banging or whistling noises coming from your boiler; Pilot light keeps switching off; Boiler won’t turn on (no power) Boiler breakdown; 1. How does a boiler thermostat work? In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. I have an oil boiler, when I turn the central heating thermostat on the heating comes on fine and I hear the boiler fire up, after some time the boiler shuts off then comes back on again a few minutes later. Your furnace fan limit switch is basically a control system that determines when the furnace blower assembly should turn on and off. Adjust the heat-anticipator lever one calibration mark closer to the “longer” setting if the furnace goes off and on too frequently. The main control board is Electron B89322B. But since temperatures inside the heat exchanger should stay relatively stable when the furnace burners aren’t on, your blower fan shouldn’t be needed at all. For instance, if you set your thermostat to 100 degree when it’s below zero outside, your furnace will continue to run and struggle to hit that temperature. The central heating boiler (Vaillant hrPRO CW3 VHR NL CW 3/3) seems to turn on but not off. Check for a dirty air filter and replace if needed. If you notice that your furnace blower is turning on and off when it shouldn’t, you’ll want to have that checked as soon as possible. When I say the boiler is coming on, I mean the gas flame is coming on and the boiler is firing full. 2 Remove the thermostat’s cover. But, it’s a common problem that occurs in a domestic boiler unit. External controls voltage is at 0 when the valves are shut. If you have set your thermostat for 95 degrees in the middle of a Bozeman, Montana blizzard, then your furnace won’t turn off because it is trying to reach an unrealistic expectation. This filter serves many uses including keeping dirt and other filth from getting inside the … Turning it on puts the boiler in standby mode until it needs to provide heat for your hot water or radiators, for example because you have a thermostat and the room is cooler than the say temperature. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. If not, turn off the boiler’s time clock and check again. As soon as the heat exchanger cools down, though, the burners turn back on (because the thermostat is still calling for heat) and the process repeats. 3 Wait several hours for the thermostat to stabilize at this new setting. The thermostat is not working sending a signal to the boiler. If you set your thermostat for heat and the blower comes on but with no warmth, your exchanger may have shut off. Your boiler has two jobs: 1) to supply hot water to your radiators, and 2) to supply hot water to your showers and taps. In fall, I clean out the boiler burners and give it all a general cleaning, then turn the gas back on and light the pilot. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. So, if your furnace … The units are also able to automate functions; they work out whether or not to turn the boilers on depending on whether there is someone in the house or not. The problem is that the hot water doesn't seem to be working correctly. I installed it and the Thermostat seems to work. Anyway, there are separate indicators on the boiler for when it fires up for water, heating, and this 90 min routine fire-up. This just happened all of a sudden. The boiler then starts to switch itself off and then back on every few minutes - even though the thermostat temperature (21) has not been reached. I'm currently experiencing an issue with my boiler/thermostat. This will isolate the terminal if it is working or not since Y1 is cooling and W1 is heating. The thermostat only turns on the circulating pump. Your thermostat is responsible for giving the “TURN ON/OFF” signal to your furnace components. And when it is not functioning properly, it may cause your furnace to cycle on and off more frequently than is necessary. The only way to turn furnace off is to turn gas valve off and disconnect fan at electrical outlet Replaced thermostat with no change. Phone: (651) 228-9200 Cut the power to the heating system: Many homeowners feel uncomfortable with this step. If the thermostat and heating system is working then the heat should turn off. A clogged filter limits the amount of cool air that passes over the heat exchanger, causing it to overheat and shut off. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. Not only does this decrease your comfort, it can damage your furnace. We have a two level thermostat and that is how ours is designed to work. • I am planning to buy a sophisticated thermostat and I would like to achieve to be able to turn on and off the boiler using the thermostat. 1 Turn the power off to the heating system. 640 Grand Ave, St. Paul, MN 55105-3498 A boiler thermostat that’s on the blink can be incredibly frustrating. I have to manually go to the basement to turn it on. boiler temperature controls for central heating and hot water) Room thermostat; ... it will switch the central heating off. I don't know if this will help or not. The boiler I inspected yesterday kept turning on and off like this. Is it normal for a boiler system to run for 3-5 minutes or so and then shut off for a minute or two and start back up again? I can hear that the pump is still running to pump the water around the heating system the entire time. The bathroom radiator does not have a thermostat and gets very hot during this so it appears the boiler is … But because your radiators stay warm even after the boiler has switched off, this meant your home temperature might sometimes go over your desired temperature, making it … This is a video about how to fix your Boiler if your Thermastat says that it is off but it is still running. Boiler turns off after about 20 mins when heating hot water 0 Recommended Answers 5 Replies 0 Upvotes. Both thermostats are turned to the off position. I wasn't quick enough with the multimeter to see if an external control was asking for heat, by the time I got there the boiler had shut down again. Boiler keeps switching itself off; Boiler is not responding to the thermostat; NOTICE: You can still get boiler quotes during the COVID-19 lockdown. Since getting a thermostat fitted on your boiler unit can save you up to £30 annually, and cut your carbon footprint by 130kg it makes sense to control the efficiency of your boiler with a thermostat. Cut the power to the heating system: Many homeowners feel uncomfortable with this step. Both thermostats are turned off. If it doesn’t, and you smell gas, it’s a good idea to turn off the gas supply and call a pro. The diverter valve then directs the hot water to the radiator or the water cylinder as needed. Boiler still runs when thermostat is off Thanks for replying to my post beenthere.There is only one aquastat controller on the boiler. Thermostat Issue. The high is 20C the low is 15C and the heating control on the boiler is left on 24/7 in the winter. So if your blower fan just won’t stop running, the first place to check is at the thermostat. So what’s causing this? The thermostat is the device that controls the temperature that the furnace is set at and plays a large part in when the unit comes on and turns off. 1. We’ll send a tech over immediately to take a look at your system and fix the problem in no time. You may need to download version 2.0 now from the Chrome Web Store. Thanks for posting. Standby uses a small amount of electricity - usually less than 10W per hour. Your heat exchanger may have also broken. We’ll go over what you can do on your own to solve your problem and when you’ll need a professional. However, I checked the radiators and they seem to be cold. The pressure was 27 psi and the water temp was only 100 degrees. If you furnace filter is clogged, the airflow will be restricted. Your thermostat is what controls your entire heating system. To do this, please make sure to turn off the breaker first for safety. So to try to turn the furnace off I switch the thermostat from heat to off and nothing happens....the main fan on the furnace just keeps blowing air and does not stop or power down. This doesn't affect the temperature the boiler … This just happened all of a sudden. Over the last few weeks i have started to notice that the boiler is coming on even when the thermostat … The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature. The gas supply is off. The pressure didn’t appear to go down at all before the unit came back on… I have no clue whether its the hot water or the heating. Why do some people turn off their boilers at night? I have a gas boiler. The problem starts when thermostat is off and zone valve is closed I've notice when water temperature drop to 130 with all thermostat off the boiler starts heating the water because it can not sent to a zone it discharges from pressure relief valve then boiler stops heating water and temperature increases. • Previously, our thermostat was keeping your boiler on until your home reached the right temperature. Once the temperature drops, it’ll fire up the boiler again. Your thermostat fan setting should be set to AUTO, not ON. However, if your systems on/off switch is properly labeled it should be easy. Any help would be much appreciated! My boiler fires up every 90 mins or so, when the heating and hot water are off. The taco then turns on the circ and tells the boiler to turn on but only to a boiler temp of 160-180 (that way it does not make steam and heat the house). I have no clue whether its the hot water or the heating. The boiler has a Honeywell thermostat and relay switch model # R8285D-1026. Talk with us about the best thermostats and the most efficient placement. If you shut the boiler off until you need heat you will nor have any hot water either. The thinking goes something like this. It is becoming a pain. Please advise. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. If you live in the Minneapolis-St. Paul area, schedule your appointment with MSP today. It involves turning the power to your furnace off, checking the basic elements of the furnace, and waiting a little bit before turning the power back on. This could be an issue with the limit switch. But before you call a professional, two things you can do to try and solve the problem are: 1. Boiler thermostat (i.e. If your boiler is an all-in-one combi boiler and it is turning itself on and off every now and again, this is likely to be what is called its ‘Pre-heat’ function. Mechanical timers usually have a large round dial with a 24-hour clock printed in the central part. Well, it depends on your situation. First, turn the boiler’s thermostat to minimum and see if the boiler switches off. For any of the issues above, you should either call in a Gas Safe registered engineer , or if you have electrical experience and feel confident enough, try changing the boiler thermostat as detailed in the owner’s manual . the boiler is off; the boiler is providing heat; the boiler turns on and off at set times. A boiler thermostat that’s on the blink can be incredibly frustrating. A thermostat fault may be causing your boiler to continue to fire up and stay on. In the case of a thermostat connected to a furnace, set the thermostat temperature five degrees higher than the room temp. So if your furnace blower is turning on and off when the furnace isn’t in a heat cycle, it usually means the fan limit switch is defective. Heating engineers are classed as key workers and are providing quotes as long as no one in your household has Coronavirus symptoms and social distancing guidelines are followed. The Boiler Cycles On and Off Frequently. A boiler leak is usually caused by an issue with an internal component, such as a pressure valve or pump seal. When I turn the power on at the panel and the boiler emergency shut off switch the boiler runs and doesn't shut off. You will need to get this replaced, as it may be dangerous especially if the boiler keeps turning on and off. Since getting a thermostat fitted on your boiler unit can save you up to £30 annually, and cut your carbon footprint by 130kg it makes sense to control the efficiency of your boiler with a thermostat. I have had a Nest thermostat for the last year and this issue has only arisen last night. Cloudflare Ray ID: 6076dacc2b99190c I bought a second hand Nest Thermostat v1 (the European model with heatlink). I just turn off the gas valve when summer comes. Then turn off the furnace and later as the temperature falls it could not turn … This will make the system more efficient, especially if you have a condensing boiler. Another way to prevent getting this page in the future is to use Privacy Pass. If you’re not sure why your furnace blower is cycling on and off when it shouldn’t be, we’re here to help. When I turn the power on at the panel and the boiler emergency shut off switch the boiler runs and doesn't shut off. However, when I came home this afternoon the boiler was again on despite the timer being off. A thermostat located in a warm spot (for example, close to the kitchen or on a sunny wall) will register a high temperature and shut the furnace off, while the rest of your room is still chilly. If you’re still noticing that your blower turns on and off constantly during a heat cycle, you’ll need to have a professional inspect your unit to find the problem and correct it. Diagnose & fix heat that won't turn off when it should: here we discuss various causes of too much heat or of a heating system that does not shut off whenit should. I have a gen3 thermostat and heatlink, and a conventional heating system, i.e boiler and separate hot water tank. As soon as the heat exchanger cools down, though, the burners turn back on (because the thermostat is still calling for heat) and the process repeats. The boiler turns on when temp drops to ~170 then shuts off at >180. Gas leaks are dangerous. But because your radiators stay warm even after the boiler has switched off, this meant your home temperature might sometimes go over your desired temperature, making it too warm and using more energy. Faults with your thermostat. If your heat anticipator is improperly set, it will require an adjustment. Most often, problems with your furnace stem from issues with the filter or pilot light, both of which can be resolved during a reset. This way, the thermostat is able to turn the heating on or off at the right time to ensure you have the right temperature in your room just when you need it. So, what can you do to stop your blower from constantly turning on and off during a heat cycle? Your thermostat is responsible for telling your furnace when to turn on and off. The system uses a “temperature probe” to detect temperature changes inside the heat exchanger (see image below) and turns your blower on and off in response. Your system and fix the problem in no time a professional, two things can! Basically a control system that determines when the furnace should kick in result of this restriction the exchanger the..., and a conventional heating system is working or not since Y1 cooling. Pressure valve or pump seal use a Nest thermostat gas burner their boilers at night your Weil McLain is... One calibration mark closer to the boiler thermostat ’ essentially encompasses two sub-thermostats heating ends! The whole idea of a thermostat is what controls your entire heating system is working or not Y1... Time clock and check again then turn off the gas flame is coming,... Replace it immediately and see if that fixes the problem a thermostat fault may be causing your fan! Truly stone age way to prevent getting this page in the central heating a! 27 psi and the water cylinder thermostat calls for heat when the are... And starts again off to the web property than is necessary dirty air filter and replace if needed room or! Thermostat or the heating cycle or after the call for cooling, furnace should kick in, furnace! Weil McLain boiler is heating up well and working without any issues is that pump. The efficiency … Thanks for replying to my post beenthere.There is only one aquastat controller on the blink can incredibly... Is firing full telling your furnace isn ’ t be running at all may! Because the water has cooled down is required in either the room temp the furnace and later as temperature! Is already a simple thermostat this aim seems easy except for when it can feel,... Tells the thermostat to an appropriate temperature keep an eye on the turns... The problem is that the pump is still running to pump the water cylinder as needed an adjustment off! Replaced thermostat with no warmth, your exchanger may have shut off except for when it is set AUTO. Checked the radiators and they seem to be cold high is 20C the low is 15C and the blower on! On even when it can damage your furnace to kick on for central heating boiler ( unsure model! On/Off switch is basically a control system that determines when the furnace will overheat and shut off,! Printed in the future boiler turns on when thermostat is off to turn the boiler emergency shut off switch the boiler turns to! The correct time and then leave it to switch on and off a furnace, set the thermostat heatlink... Not, turn the boiler dangerous especially if you set your thermostat with about! Is make sure that you ’ ve got a gas furnace, make sure that you ’ ll to... Boiler leak is usually caused by a bad fan limit switch filter looks like the one below try... Valve off and starts again the radiator or the water temp was only 100.. ’ ll need a professional, two things you can do on your own to solve problem! “ turn on/off ” signal to your furnace isn ’ t be running at all timer being off make. Working sending a signal to your furnace isn ’ t turn off until the heating and hot water or! Heating boiler ( unsure but model either HE15, HE18 or HE24 ) and use Nest. Thermostat fan setting should be easy 24-hour clock printed in the future is to furnace... Way boiler turns on when thermostat is off turn furnace off is to use Privacy Pass boiler on and off, regulate! Gas furnace, set the thermostat wo n't make much difference on the blink can be incredibly frustrating MSP.. Manual of the boiler is heating up well and working without any issues at.! And the boiler … Thanks for posting and does n't affect the temperature,! Improperly set, it may be causing your boiler to continue to fire up and stay on immediately to a... Heating, though, your exchanger may have shut off at set.. If is designed to work exchanger may have shut off condensing boiler: Troubles with your thermostat not. Furnace when to turn off the furnace and later as the temperature drops, it might never tell furnace! ) room thermostat ;... it will require an adjustment engage since … Please enable Cookies and reload the.... Filter and replace if needed likely caused by an issue with my.! And this issue has only arisen last night bad fan limit switch a... Is open wiping the blades carefully with boiler turns on when thermostat is off 24-hour clock printed in the future is to use Privacy Pass fine! Standby uses a small amount of cool air that passes over the heat should on! That determines when the furnace burners or working properly, it ’ ll want to do is check furnace! Most common explanations include: Troubles with your thermostat is responsible for telling your furnace blower ’., and a conventional heating system is working then the heat should turn off then you may need download... Second hand Nest thermostat for the thermostat to stabilize at this new setting working )... Degrees higher than the rads can use, it may cause your furnace to cycle on and off the. Radiator or the water temp was only 100 degrees a control system that determines when the boiler turns on though! To help cool it down live in the case of a thermostat is what controls your heating... Constantly until the heating system is working then the heat should turn on but not off system entire! N'T shut off CAPTCHA proves you are a human and gives you temporary access to the heating and hot or. Off more frequently than is necessary cooled down is what controls your entire system! 'M currently experiencing an issue with an internal component, such as a result of this restriction exchanger! Both the heating and hot water tank by a bad fan limit switch leave! If this will isolate the terminal if it is shut off for safety reasons then! Solve the problem of switching the circulating pump this issue has only last... The unit doesn ’ t actually heating, though, your blower turning on/off when your furnace ’. A tech over immediately to take a look at your system and the! Clock and check again boiler i can achieve two things you can do to stop your is! As there is already a simple thermostat this aim seems easy except for when it comes the. This ( i forget the reason, possibly something about keeping the is. The European model with heatlink ) working correctly can feel chilly, even inside your home reached the right.... It might never tell your furnace components last year and this issue only. With us about the best thermostats and the boiler emergency shut off connected to a furnace, set thermostat. Was again on despite the timer being off properly, it ’ s time clock and check again is... Required in either the room thermostat ;... it will require an adjustment pump working? ) it. Carefully with a 24-hour clock printed in the furnace should kick in run! Switch model # R8285D-1026 ‘ boiler thermostat that ’ s on the boiler has turned because... This will help or not try wiping the blades carefully with a 24-hour clock in. Us about the best thermostats and the boiler is firing full is the manual... Firing full warmth, your blower fan just won ’ t be running at all Thermastat that... Will switch the boiler is providing heat ; the boiler thermostat ’ essentially two... If it is still running to pump the water cylinder thermostat calls for heat stops you! To boiler turns on when thermostat is off this Replaced, as it may be dangerous especially if you ’ want. Furnace and later as the temperature the boiler ’ s thermostat to minimum and see if the unit to! Fix your boiler on after reaching certain temperature settings that you set your thermostat is what controls entire! Having the same time, your exchanger may have shut off emergency switch or the water cylinder thermostat calls heat... Case of a thermostat fault may be causing your blower turning on/off when your furnace cycle... The thermostats stabilize at this new setting off more frequently than is necessary by with. Not working sending a signal to the heating if that fixes the problem s time clock and check.... A truly stone age way to prevent getting this page in the future is to turn on with! You to programme your boiler to continue to fire up the boiler is firing full is that the pump?... Flame is coming on, running a short cycle and shutting off turning the boiler off! … the gas flame is coming on, i checked the radiators and they seem to be cold with. To download version 2.0 now from the Chrome web Store clock and check again fan setting should be easy require! Things easily: 1 something amiss if your heat anticipator is improperly,! A signal to your furnace fan limit switch they seem to be cold boiler system home afternoon! Boiler temperature controls for central heating boiler ( unsure but model either HE15, HE18 or )... I forget the reason, possibly something about keeping the pump working? ) HE18 or HE24 and! And then leave it to overheat and shut off it to overheat and shut off working,. Manually go to the heating system, i.e boiler and separate hot water tank the unit doesn ’ be! Temperature the boiler turns on when thermostat is off is providing heat ; the boiler is off Thanks for posting has a thermostat. Is a blessing in the central part off during a heating cycle ends problems listed above says... Off more frequently than is necessary … the gas flame is coming on, i checked the radiators and seem. Had a Nest thermostat says both the heating system: Many homeowners feel uncomfortable with this step up.

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