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Oct 26, 2013 - i have a gas furnace with a lit pilot, but the burners won't light. ... if the thermocouple does not sense the heat of the pilot it prevents the gas controller fromturning on the burners. ... clamped onto the outgoing hot water pipe, if huydronic system) that is telling the furnace it is too hot, whether or not that is true.
Generally, if a RV water heater is self igniting, then it is not designed to be lit manually. If you remove the outside vent cover door, then the unit can be observed. The self igniter should be visible at a point of where the pilot light is located. The problem with trying to light the water heater manually is that the circuit that activates the igniter also turns on the gas at the same time. If the igniter is not getting power, then most likely the valve to turn on the gas is not getting power either. If the problem is that the igniter itself has failed, then it may be possible, but unlikely, that with someone inside activating the turn on switch and a flame being applied to the pilot light area, at the same time, the pilot may light.
IF no gas comes and the piolet is lit then the gas valve is stuck. You can purchase a seperate gas valve and replace it. If it is cost justified ,you will have to determine. As far as I know, one cannot disassemble and repair the gas valve as you cannot purchase the parts for it.
The manual says to hold a match near the pilot while the ignitor is
trying. It says that if the unit lights the pilot orifice may be dirty
or clogged. Then the manual says to check
the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.
Check to see if the thermocouple tip is in line with the pilots flame, if its not heating the tip then carefully adjust as necessary. If the tip is in the flame and still wont stay lit then the thermocouple is due for a replacement.This task may require that the burner assy. be removed, so as to access the fasteners that attach thermocouple tip, hence disconnecting the gas line that leads to the burner, and must be properly reinstalled and leak tested. This item can be found at most hardware stores and home centers (Home depot/Lowes) be sure to gently remove the old one and take it with you (for comparison) when you are ready to purchase the new part.
Note: As with any repair of this nature, safety must come first, quality gloves and eye protection should be warn. also do not attempt any repair that is outside of your ability and knowledge.
check ot see if it has a safty eset on it. If it does then you can reset it and watch to see if it was just a intermittent problem or if it still locks out then you probly needd to ccall out a service company to check the uit out. Good Luck