Does the main blower fan kick on? Also, if the heater is vented outside via a flue pipe, there may be a small (about 3 or 4 inches in diameter) vent fan that kicks on to ensure the exhaust fumes are evacuated through the flue pipe. If there's a problem with that fan, the burner won't light either.
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If you light your pilot light, hold in the button and then when you release it and the pilot light goes out, generally you need a new thermocouple. Gas repairs can only be undertaken by a qualified gas technician so you can't do this job yourself.
The thermocouple is a safety device that recognises that the pilot has a good flame and is enough to ignite the main burners. The thermocouple open that valve to the burner.
In limited circumstances the thermocouple doesn't need replacing, either the shield that aims the flame to the thermocouple has become dislodged, or the pilot jet is a little blocked by debris. Either way, having the appliance serviced by a qualified gas fitter is the way to go. I am sure you will have seen news stories about explosions caused by gas leaks and faulty appliances.
Find where the gas line connects to the gas valve on the back of the heater, from the gas valve, follow a small aluminum tube going into the back of the heater. There may be a removable door to access the pilot assembly. If there is no aluminum tube, the unit has electronic ignition and no pilot lite. Turn the gas knob to off, then to pilot. Hold the gas valve in and with a long match or gas grill lighter, light the pilot. Continue to hold the knob in for about 30 seconds. After that, release the knob and check to make sure the pilot stays lit. If so, rotate the knob to ON. The thermostat will kick the burners on.
On older systems the fan is controlled by a time delay relay which will turn of the blower after a preset time when a call for heat is present regardless if there is a burner function or not. Need to check why the main gas valve is not energizing, there are to many configurations for a complete diagnostic without further info, Model, Brand etc.
THIS HEATER DO NOT HAVE A PILOT YOU MUST HAVE A DIFFERENT MODEL. DO YOU GAS? TURN KNOB TO PILOT PRESS. LIGTH PILOT WAIT FOR 60 SEC AND RELEASE IF STAY ON TURN KNOB TO ON. IF TURN OFF PILOT MUST BE REPLACE
Hi the thermocouple is a long copper wire that goes back to the gas valve from the pilot .
i would clean the flame senser first , then check the pressure switch jump this out , then check the fan control or snap disc jump this out see if it runs if you need A THERMOCOUPLE then honeywell universal will do