Janitrol Furnace troubles?
I have an older Janitrol GU050-2 gas furnace with a standard gas pilot.
The unit fires up OK then after anywhere from 1 to 5 minutes later the system shuts down and the pilot goes out.
I’ve monitored the voltage on the gas valve, no change, 24vac.
I’ve jumped out hi temp switch, (temporarily for troubleshooting), same problem exsists.
I’ve watched the fan limit switch turn on the fan at about 150 and off at 75 or so, burner stays on during this cycle.
If I lite the pilot and turn the tstat off, the pilot stays on. no problem.
Just got to be something simple, right?
May be simple, but may not be good. It is very possible that your heat exchanger is cracked and that the burners are getting a direct blast of air from your blower. You should have it checked as that model was prone to bad exchangers.
On the other hand, if you have 24 at the valve when the flame goes out, it is you gas valve.
Good luck
Note: If it were your thermocouple, the pilot would not stay lit, as you stated it does. I would check to be sure the pilot is burning strong and that the orfice is clear of debris.
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Tags: janitrol limit switches