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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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Dyna glo ra18lpdg pilot won't stay lit.


would have to think the thermocouple need replaced or the pilot flame is not big enough

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Pilot is lit ,but when i turn the thremostat on nothing.


Has the control knob been turned from the PILOT position to the ON position?
If that has been done, check the wiring from the thermostat to the Gas Control Valve in the heater. Make sure the wires are connected in both places (T-Stat & Control Valve). If all of that appears to be correct, there's a good chance that the Thermopile (I think Williams calls it a Pilot Generator) has failed. This part generates millivolts of electricity to open and close the gas valve when the Thermostat calls for heat. But, don't confuse the Thermopile with the Thermocouple. Your unit has both. And since the pilot is burning, that tells me it's not a problem with the Thermocouple.

Anyway, the only way to test the thermopile is with a millivolt multimeter. You will have to consult your Owners Manual for the proper millivolt output for your heater.

Hope this helps head you in right direction in solving this problem.

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1 Answer

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do you have a CO detectors? If so try resetting them

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Pilot is lit, but does not ignite heater


Take the red and white wires going to your thermostat and jump them together. If the unit starts, you have a bad thermostat. If not, at the furnace, jump out the terminals where the thermostat wires are connected to. If the unit starts, you have a bad thermostat wire or connection. If not, you will need to check for 24 volts at the gas valve while the thermostat is calling for heat. If yes, bad gas valve. If no, bad transformer.

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Finding Pilot light on Goodman Model caf024a2a. Cannot seem to find the pilot light...The blower works but no heat.


i think the ca # is for the cooling coil unit - the heater should start with gmXXXXX - if your unit is fairly new - the pilot light electronically when thermostat calls for heat the unit will not light if the burner door is open

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1 Answer

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The pilot has to be lit.And to do so turn the knob to pilot.Then press it down and gas will come threw the pilot,then light the pilot,and hold the button down for about 45 seconds,count slow.The pilot has to heat the thermocouple up before the pilot light will stay on.Once it stays lit,turn the knob to on.

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The thermocoupler is no good. It's that bulb sitting in the pilot flame. when it goes out it shuts everything doen in the main valve. It has to be kept hot by the pilot, that's how it know whether or not it is safe to open the main .

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1 Answer

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You may need to replace the Thermocoupler. It screws into the gas regulator and the sensor end is set in the flame of the pilot light. You can get one at any appliance parts store. The Thermocoupler simply feels the heat of the pilot light and sends a very small amount of voltage to the gas switch that opens when your thermostat calls for heat. If the pilot light isnt lit, no voltage from the sensor and no gas can be released by the regulator.
Anyone can replace one. Just find the tip that sits in the the pilot flame when you try to ignite the pilot light. Follow it down to the regulator and unscrew it. There is no gas involved. It is Ultra Low Voltage. No danger.
Be sure to turn off the power to the unit before you begin removal. Take it to the parts store along with your furnace brand and model number. If you see any identifiers on the regulator, note them and take them with. When you replace it be sure to have the sensor end up in the flame of the pilot.

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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.

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First check thermostat is calling for heat or if gas valve fault get unit serviced

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