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Try unhooking one of the battery cables and leave it off for at least 20 minutes. When you hook it back up the computers should re-boot. That has solved problems for me with heater, interior lites, power windows, AC, day time running lites, power mirrors, CD player, and wipers on GM autos and S-10 PU and Dodge trucks. None of the switches are connected to the device they control anymore. The switch tells the computer to open the window and the computer send a signal to the window motor. When the computer gets confused strange things will happen or not happen. Of course you may have to re-set your radio stations.
Yes! make sure the door is on the unit to close the power switch first and observe the cycles. This should be a 4-step cycle, #1, vent fan turns on.... #2 the pilot lites ups.... #3 the gas valve sends gas to the gas ports to heat up the box...& #4 the main fan should comes on!T Y V M !
1st place i would check is pressure switch.this component is number 1 in failure frequency.depending on your model,it is either screwed into in/out header or behind front panel. check for continuity(with pump running) using multi-meter.
The gasvalve has a pilot solenoid which is powered by in essence a thermocouple called a thermopile which converts heatfrom the pilot to to a millivolt output which is why you have to hold the pilot valve till it makes electricty. The main gas valve goes through a series of safety switches and through the thermostat so if any switch has a badoropen contact the heater will never fire find the bad part with a continuity tester and replace it.
It may also be the high temp switches under the 2" inlet/outlet header. The 150 degree high-limit switch sits horizontal and corrosion happens often there. But be careful removing as if the header is corroded and the switch is also, water will flow out , so be ready to bypass the heater. You will have to replace the header. Try to jumpe that switch out and I'll bet the heater fires up.
1st time this happened to me the filter wasn't clean. 2nd time it was
the pressure switch and for the third time they say I have to bleed the
gas line, not enough gas to lite. And I also need the on/off switch