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furnace rheem 90 not igniting

Asked Nov 18, 2011, 02:35 PM — 2 Answers
Rheem Imperial 90 Plus not igniting.

Symptoms – When heat called for: tries to fire. Over and over a click from a module on the control board (ST788C1002). A green flash comes from the module on the control board that is clicking.

Ignition Control Module – Honeywell 47-22481-01 – does not give any LED indications at all - No blinks at all on the LED on the Ignition Control module.

Blower working fine.

Sensor has been cleaned with sandpaper. Ignitor appears to be fine. It was replaced about 3 years ago. Heat Exchanger replaced about 10 years ago – warranty. Burners replaced about 5 years ago. I have photos taken today ready to forward if they will help.

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2 Answers
T-Top's Avatar
T-Top Posts: 1,871, Reputation: 531
Ultra Member
  
#2

Nov 18, 2011, 05:47 PM
Sounds like to me you have a bad hot surface ignitor. If its not glowing and you can see a white ash spot on the ignitor its bad.
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KyJoey's Avatar
KyJoey Posts: 2, Reputation: 10
Junior Member
  
#3

Dec 3, 2011, 03:50 PM
It's not the ignitor - I just replaced it with a new one, and same thing as described in original question.

Any more ideas please?
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