Janitrol heater keeps shutting off.


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Old 11-09-10, 12:53 PM
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Question Janitrol heater keeps shutting off.

I have a Janitrol natural gas furnace. Here is what it is doing:
-The furnace will go through its start up cycle and the gas ignites.
-The furnace will run for about 5 minutes and then shut off.
-The furnace will immediately begin a relight sequence.
-After three attempts, the system will go into lockout mode.
-The circuit board flashes once every few seconds.
-The circulating fan will continue to run and blows cold air.

This has happened in the past. It used to just have to be reset be turning off the power switch and turning it back on. Sometimes this would work for days. However it now only works for a few hours before it messes up again.

In the pasts year, I have replaced the igniter coil, the circuit board, and the circulating fan/motor assembly. Any help anyone could offer would be appreciated. Thank you ahead of time.
 
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Old 11-09-10, 05:43 PM
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There should be a key to the blink code either on the board or possibly inside the blower compartment door.
 
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Old 11-09-10, 05:49 PM
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Originally Posted by toolride View Post

In the pasts year, I have replaced the igniter coil, the circuit board, and the circulating fan/motor assembly. Any help anyone could offer would be appreciated. Thank you ahead of time.

More evidence, were it needed, that guessing isn't an adequate diagnostic method.


When the furnace attempts to relight, what does it do? Id the inducer motor on? Does the hot surface ignitor heat up? Does the main burner gas turn on? Does the main burner gas light up? If the main burner gas lights up, how long does it stay on?
 
 

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