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Boiler not firing - Carrier Air Conditioners

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Make sure the gas is turned on secondly check to make sure you have a pilot light,if you have spark ignition instead then your spark box is bad,also check the breaker

Posted on Nov 16, 2008

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Where do i adjust boiler temp on a gas fired boiler


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We needed to turn the water off at the stopcock to repair a tap and for safety we turned the boiler from all day to off. when we turned the water on again the boiler was off completely. what do we need to...


Hi the temperature control on the boiler should start the boiler as soon as you restore power to it. I don't know if you have a automatic ignition module or a standing pilot. If it is a standing pilot, make sure it is lite.You should have a temperature gauge telling you the water temp., and if it was off all day I am sure it is very cool. Do you have a drain valve on the front bottom of this boiler? If so, and you have a floor drain, turn it on as you may have gotten air in the system causing it not to fire up. If not, open all outside hose bibs/faucets and indoor faucets and let them run for awhile. If the water was drained out from the boiler to repair this tap, its off on its low pressure shut off switch. This is a safety. After bleeding any dirt or air from the system, make sure that you hear the boiler filling up with water. Once it reaches its low pressure cut off, it will fire up and start to heat the water. I don't know how large it is, but it may take some time to reach its cut out switch before it will fire again. Please keep me posted in the comment box. Please rate me on my help to you, and I thank you for this.
Sincerely, Shastalaker7
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Feb 20, 2011 | Air Conditioners

1 Answer

The boiler is not heating radiators and no hot water. Any ideas? Is there anyway of resetting the boiler? If so how do I do it? Thanks in advance.


when you say not heating do you mean the boiler is firing and not getting hot enough? If it is not firing at all check t-stat to make sure it is calling for heat. also check aqua stat and low water cut-off. your low water cutoff can be reset there is a small button on the side and your boiler motor has one as well just look around it can be hard to find.

Jan 24, 2011 | Air Conditioners

2 Answers

The boiler wont fire up and the blue light flashes once per second


Let's see what we can do to trouble-shoot this boiler--

First of all-- Are we talking about a Hot Water 'Boiler'-- In other words does this boiler heat water that circulates thru the house, to keep you warm?

Next-- What is your fuel?

Have you Shut the system down, to reset it?-- What happens when it comes back on again?-- Clicking sounds-- pumps trying to start-- solenoids trying to open, etc.-- Tell us what you observe-- so we can help you trouble shoot this problem.

Mack B

Jan 15, 2011 | Air Conditioners

1 Answer

I have a vulcan continental boiler , heating system , and its not fireing up , i think there is air in the system , whats the best way in to bleeding it out ?


Air in what system?--
The Circulating 'Hot' water?-- or in the fuel? (What kind of fuel?)

Normally a hot water boiler will fire, as long as ther is water in the boiler,
So-- are you suspecting there is Low water in the boiler?
Can yo hear the water circulating thru the water pump?-- is the water pump running?

Tell us more about what happens when you first give it a call for heat?
Do any fans or valve try to start?-- any indicator lights?

Tell us some of the obvious things, and maybe there is a clue in something you tell us or observe.

Mack B

Jan 14, 2011 | Air Conditioners

1 Answer

I'm a new plumber. I was asked to restart a burnham gas fired steam boiler in a fire damaged apartment. The boiler was drained last winter along with the radiators but was not winerized. I am their plumber...


1. You need to fill the entire system with water before you fire it, boiler AND radiators... Then, you would normally vent as much of the trapped air in the system as you could... It's not like you are only going to fill just the boiler and then pump that water through the pipes.

There is a temp setting on the boiler, but I don't think that's a solution. Remember that the water in the system is going to begin circulating as soon as you start the boiler. So, it will start circulating when it's cold, and then gradually warm up.

Your problem is not the sudden rush of hot water, it's going to be filling the system in the first place, and getting the boiler started before the system freezes up ...

I don't really have any suggestions for you though, other than perhaps renting one of those construction heaters ... and bring the building temp up a bit. But there's certain dangers associated with them too... Carbon Monoxide for one, fire is another (if used improperly).

Just thought of something: Fill the system with glycol based anti-freeze solution that's designed for heating systems. That oughta do it...

I'm guessing there's not a functioning water heater either at this point, is there ? If there was, you could possibly rig something up to fill the system with lukewarm water, and fire it before it freezes up.

2. You don't have a lot of choice. You have to fill the system, fire the boiler & wait.
It is going to take a long time to get the system up to temperature. Instant circulation is a double edged sword. The upside is you get a little bit of heat into the water & have it moving making freezing less likely. The downside is, it's hard on the boiler with that much cold water coming back you are likely to have condensation.

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My Worcester Bosch 35cdi boiler is flashing temp then backwards t forwards t, whats wrong with it.?


35 cdi worcester combi about 3 years old,heating not working,hot water works fine.It's been serviced not long ago.Room stat turned up and trv's ,but boiler want fire up,there's power to the boiler and the room stat the built in time clock is switched to on, but still nothing. do you think it could be the diverter valve, when i got there it was flashing SE which mean's it needs a service,cleaned the heat exchanger and burner with the proper worceter brush etc then re set boiler with technical, they also said it could be the built in clock and told me to disconect it, and just use the heating stat to control it.It still want fire.

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Gas Boiler will supply /fire up to supply Central heating When Room thermastat turned up and switched to Heating and Hot water. When on Hot water Only will not fire up even though thermostat on hot water...


most likly or a shorted wire unhook the wire from the boiler see if it stops then if it's still is on it's in the boiler if off try unhooking it at the t-stat on the heater this should narrow it down for you dan

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