Ignitor not warming

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  #1  
Old 01-05-11, 12:54 PM
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Ignitor not warming

Hello all,

I have a Rheem Criterion gas furnace. The ignitor, glow kind, was not igniting. I removed the ignitor and found it was cracked. I manually lit the furnace until I got new ignitor. The furnace ran fine.
I installed the new ignitor, reset system, and nothing!
The furnace will cycle thru like it is supposed to but the new ignitor will not glow to light. I can still manually light the furnace but am at a loss to why the ignitor is not warming.
I have 110v at the plug in for ignitor. The circuit board has two green lights, power and ok light, according to manual. Both are lit and do not flash any errors. I have checked the vent, pressure switch, and the rollout switch.
I am at a complete loss as to what could be wrong. I am still manually lighting and it is running just fine.

Any help/suggestions would be greatly appreciated. Thanks!
 
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Old 01-05-11, 01:28 PM
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Sounds like your new ignitor is no good. If you have 120VAC being switched on to the ignitor as you describe, it should heat up.

Try measuring the resistance across the ignitor. It's typically 15 ohms or so.
 
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Old 01-05-11, 01:33 PM
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I did and it was good. I also wired the ignitor and plugged it into a surge protector plugged into the wall outlet and it took about 3 sec. to start glowing.
 
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Old 01-05-11, 03:34 PM
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Well then ---- measure the AC voltage being applied to the ignitor while the igniter is connected.

The voltage and the ignitor can't both be good. One possibility is that a relay isn't making a good connection to supply voltage, and the open circuit voltage is 120 volts but the voltage drops to a low level when a load like the igniter is connected.
 
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