Gas Furnace won't turn on.


Old 03-07-20, 02:04 AM
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Gas Furnace won't turn on.

I have a Rheem gas furnace with an HS780 ignition control module. I just bought a new surface ignitor because the old one was cracked. When I turn on the furnace I hear a few clicks but nothing happens. No spark, No gas, and ignitor won't glow. No blower. The fan will work if I turn it on from the thermostat but will not turn on automatically. Pleas help.
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Old 03-07-20, 04:40 AM
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Was the furnace operating correctly before changing the ignitor?
Old 03-07-20, 05:50 AM
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First, is there any errors showing?
Is the furnace getting a call to run?
Old 03-07-20, 09:03 AM
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There won't be any spark with a surface igniter.
On a call for heat...... does the draft inducer start running ?
I'm guessing yes.

Do you have a meter ?
Check the continuity of the hot surface igniter. You may have cracked it.
Check the voltage on the igniter line. It should be 120vAC approx 15 seconds after inducer starts.
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