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One out of 5 or 6 times the heat exchanger will ignite and run about 60 seconds and the circulating fan will not come on.until the exhaust fan runs about 3 minutes and then it will energize

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This will be due to a finicky blower relay. Whether on a circuit board or stand alone....the blower relay will be your issue

Posted on May 11, 2010

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Posted on Jan 02, 2017

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Taco 007 circulating pump stays on even though boiler shuts down


Don't know your specific unit, but in general, heating systems are two-stage devices:

1: Its too cold: the motorised HW/CH valve moved to the required position, and on achieving it, the circulaion pump starts and the boiler is enabled. (The circ pump may start immediately - its not usually important.) The hot water from the boiler circulates through the heat exchanger and/or radiators until the thermostat thinks its target is warm enough, whereupon it disables the boiler, stops the pump and closes/relaxes the valve(s).

2: The boiler is off while disabled. When enabled, it heats the circulating water to a 'high' temperature and seeks to keep it there. If it reaches that temperature, the boiler will cycle on and off as necessary to maintain the set 'high' temperature. (The circulation pump must run all the time the boiler is enabled.) This may be what you're noticing. Additionally, some boilers will run the circulation pump for a little while after being disabled to reduce the temperature if the water in the pipes and boiler.

Your question doesn't say how the pump running corresponds to thee thermostat settings, but if it were stuck on, I think you'd know!

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Bryant gas furnace does the blower motor have to work for the heat exchanger to light up both are not working


It depends....on if you are talking about a small blower in the front of the furnace or the indoor fan motor. If your furnace is an 80% effficiency rating or above it will have a 'combustion air' fan....that will be a small on in front of the furnace in the vestibule under the front cover. If you have that motor and that is the one you are asking about...then YES it has to be running prior to the furnace igniting the gas.

If you are talking about the indoor fan motor for circulating air into your ducts, then NO it does not have to be running in order for the furnace to ignite. But it WILL have to run to remove the heat from the heat exchanger after it ignites or it willl overheat and shut off on high limit.

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I have a goodman gmpno 60. I have a lot of flame rollout especially on ignition rolls all the way out the box. After ignition and before Blower kicks on still have flame rollout but is more after Blower...


This was my 1st thought after a crack. The fact the indoor blower affects it is a give away. I would get a carbon monoxide detector, if it goes off you have some work to do.

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Draft Inducer problem


On the call for heat from the thermostat the inducer should come on first, a pressure switch proves that the inducer is moving enough air up the stack, closes and energizes the ignition and burners come on. 30 to 60 seconds later the blower comes on. Everything should stay on as long as the thermostat is still calling for heat. When the thermostat is satisfied the burner and inducer shut off and the fan will run to remove the heat from the heat exchanger and then shut off. Cycle complete. Some inducers have a post purge so when the thermostat is satisfied the burner shuts off, the inducer runs for 30 seconds or so and then shuts off. I am thinking that your furnace may be running on the limit switch and when the burner is off but the inducer stays on, maybe the limit is shutting of the inducer. Check your air filter and make sure all your heat registers are open and that the return air grill is not blocked.

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Gas backup wont light. repairman said need new heat exchanger. approx 60 days ago replaced all burners and it woked ok they got it running for 1 night now it is out again. if the xchanger is bad why did...


I would only assume that now you have taken out an over heating sensor. When a heat exchanger goes bad it is a very dangerous situation because now you are pumping carbon monoxide in your house along with your heat. A heat exchanger is a baffle that hot gases pass thru, heating up the exchanger along the way and expelling carbon monoxide out the exhaust/chimney. Bad exchangers crack along seams or burn holes thru allowing the exhaust to mix with the blower air and in time this could cause carbon monoxide build up in your house. This cracking also lets hot exhaust in to the furnace and can burn up over heat protection, wiring and possibly cause a house fire. Please change out the heat exchanger or entire furnace, there is no price to replace a human life.

Dec 20, 2010 | Heating & Cooling

1 Answer

One out of 5 or 6 times the heat exchanger will ignite and run about 60 seconds and the circulating fan will not come on.until the exhaust fan runs about 3 minutes and then it will energize


Need make and model number of unit. But sounds like a limit switch. Check filters and pull and clean limit. It is located above burner. Small square plate with two wires coming off it. Rus

Mar 17, 2010 | Heating & Cooling

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A 1979 Colman RV furnace. Blower shuts off shortly after burner shuts off leaving a hot heat exchanger. After 15 seconds blower comes on again blows for 10 seconds shuts off comes on in 15 seconds blows...


The fan limiting switch is acting up. It should stay running until lower temp is reached. It will cycle until the temp stays below or at the low setting. Limit switches are adjustable.

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Heater cycles on and of, pool/spa does not reach desired temp


hello, It sounds like you may not be getting circulation thru the heater. Make sure the valves are open to allow water to pass thru the heating system. Some systems use a bypass on the heater so there is not a lot of wear on the coil system in the heater. If it is not circulating it will get too hot and the safety shut down will occure. If you are getting water circulating thru the heater, then the thermocouple or auto start igniter system is not working correctly. It is trying to start and can't then recycles. If the burners are igniting on the startup and then shutting back down you may have a bad control unit or thermal sensor unit. Since the unit is gas have a professional service it for you. Good Luck, RAC

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2 Answers

York hvac heat problem


whats happenening is that the unit's nare probably going off on the high limits. Thats when the fans will run until they are cycled off manually. Check yor filters and the belts to make sure that you are moveiong enough air for the unit. theanks for usin Fixya.

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