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Heat will not come on. I think thermostat is fine and the pilot is lit on the unit. what else could i check?

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You can check if the thermostat is working or not by removing the thermostat from its base and placing a jumper wire from the red wire to the white wire. If the furnace burner lights then you have a thermostat problem.

Posted on Dec 14, 2008

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My heat won't come on.


Newer furnaces do not have a pilot light. If yours does, you will have to relight it. Find the gas valve inside the furnace and follow the lighting directions. Generally, you turn the valve to the pilot position, press a button and hold it while you light the pilot. Hold it for about a minute and then release. If the pilot stays lit, then you can go ahead and set the thermostat to call for heat. If it does not stay lit, or the furnace still will not light, I think you need to call a repairmen or someone with knowledge of how to troubleshoot the problem.

Mar 21, 2014 | Heating & Cooling

1 Answer

Hayward spa pool heater pilot on, heat does not ignite burners


Don't really think the gas company would be checking your pool heater, they most likely just checked their gas connections. I would suspect a few things; control module, thermostat, gas valve, pressure switch. You say you get pilot light, and as long as it doesn't turn off and on, as if it is not being sensed, then I would suggest the control module is fine. If the pilot and main burner is controlled by the same valve, and your pilot light stays lit, then I would suggest the thermostat is fine. I take back the pressure switch since the pilot will ignite. I would check power to the gas valve solenoid and see if the control module is trying to open the gas valve. I would suspect low voltage, probably around 24v. If voltage is present and no gas, I would say you found the problem.

Apr 09, 2013 | Hayward H Series Pool & Spa Heater...

1 Answer

Im having problems with my Model 1800 broaster. The pilot light goes out once in awhile. But, sometimes when the Heat light is on the burner is not burning but the pilot light is on. It will just stop


If the problems are as you describe, they are actually two separate problems and aren't related. If your unit was manufactured before 1999, it has a standing pilot that should stay lit all the time. If it is just droppiing out intermittently, check the J-Block circuit. That is the two wires that connect between the Hi Limit and a brass adaptor that the pilot burner thermocouple is plugged into. These are some fairly fine wires that as the unit ages become brittle. It is lilkely that they are making intermittent contact, which is causing the pilot to drop out.
If your burner is occasionally quitting when the pilot is still lit and the Heat On light is still on, you need to check the voltage from the control panel to the gas valve (assuming this is a solid state controlled unit). If the 120V is still present, the gas valve is at fault. If the 120V is not present (and the Heat On light is definitely on) then the controller is at fault. If this unit has a mechanical thermostat and timer, then the only cause for the burner dropping out while the Heat On light is on is either a bad gas valve or intermittent electrical connection between the gas valve and the thermostat.

Jul 13, 2012 | Kitchen Appliances - Others

1 Answer

Reliance 606 natural gas water heater - model #640YORT - water does not stay hot. pilot has to be clicked to heat and then u can use hot water til tank empty and it will not continue to heat water.


If I understand correctly, the pilot light is not staying lit.
You light the pilot and water in the tank reaches temperature.
Once hot water is gone, then pilot light has to be lit again.

Gas pressure is good, and gas is flowing.
Thermostat is working at high end because it cuts off heating.
Vent is working because tank heats up.
Air intake is working.

Gas control thermostat might not be reading low temperature. Replace gas control valve.
Pilot tube might be dirty. Clean burner parts and combustion chamber, and air intake, and vent.
Backdraft might be blowing out pilot. Check for constant updraft by running water heater 5 minutes, and then light match under vent hood and see if smoke goes up.
Very hot air can put out pilot, especially when water heater located in attic. Add ventilation.
Improper vent might have water dripping back down into combustion chamber and putting out pilot light and rusting out the parts. Inspect for rusted parts and water.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf

Aug 09, 2011 | Reliance Natural Gas Water Heater Control

1 Answer

Wont start up pilot is lit and thats all it will do


Here are some pointers:
Check first if the unit receive standard gas pressure required on the nameplate.
Ensure that the thermopile is free of soot or any form of dirt.
Pilot flame quality must be good so that it can properly heat up the thermopile.
Gas valve knob must be turned to "ON" position after the pilot is lit.
Thermostat set at temperature higher than present oil temperature.
Wires are all tightly connected on terminals.

Regards.

Jun 21, 2011 | Frymaster Dean 2424G Deep Fryer

1 Answer

Water not hot even thermostate turned to high. The pilot light is on. Shoulder I be able to visualise the burner actually firing.,or hear it firing. I can see the pilot light clearly. Please help


If you have cold water now, you should hear the unit fire up and run while heating water. Proceedure would be; pilot is lit with thermostat at pilot setting. Once pilot is lit, you turn up to desired temp setting and you should hear the heater running. Depending on lighting, you should be able to see it slightly brighter and may flicker some while heating.

Apr 25, 2011 | Rheem Water Heaters

1 Answer

We changed the thermostat in our unit and now the pilot lite won't stay lit!


You have to check the following:
1. Does the pilot flame has the ability to heat up the thermopile? Themopile must be properly heated in order to generate voltage to open the pilot valve as well as main valve.
2. When the thermolpile is heated, does it generates 500 millivolts? If not, your thermopile needs replacement. If it does and still the pilot flame wont stay lit, your gas valve needs replacement.
3. Does the hi limit device has continuity on its terminals? If there is no continuity on hi limit terminals, you have to replace it. One of the thermopile wire passes on this hi limit terminal to cut the voltage supply on pilot valve in case the oil temperature reaches 450F.
4. Check and tighten all wiring connections, millivolts generated by thermopile will not pass on loosely terminated wiring.

Jan 12, 2011 | Pitco Frialator 35CS Deep Fryer

1 Answer

Pitco Fryer will not light up


Check the thermopile, it must be free of dirt or soot so that it can absorb enough heat from pilot flame and in turn can generate the right amount of voltage to energize pilot and burner coils.
Check also the gas pressure, it should be of standard as required on the unit's nameplate.

Apr 15, 2010 | Pitco Frialator SG14 Deep Fryer

1 Answer

My honeywell gas suspended garage heater will not come on when the t'stat calls for heat. It is a heat only unit and neither the fan nor the blower motor will come on. The Heater is getting power to it...


The pilot light has to be lit before gas valve will operate. That's a safety feature so the valve won't open and fill the garage with gas and possibly cause an explosion or fire. If you have a standing pilot and can't get pilot to stay lit, it's usually the thermocouple and it will need to be replaced. Once the pilot is lit, the gas valve comes on and heats the combustion chamber up to approx. 100° to 125° a thermostat controlled fan switch will close and bring the blower on.

Sep 08, 2009 | Mr. Heater Suspended Garage Heater

1 Answer

Furnace pilot is on, pilot ignitor continues to click, no main flame


sounds like the sensing bar on the spark ignition is dirty.....a wire brush works nicely.

Oct 17, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

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