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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7715
Experience:  Furnace, A/C and heat pump specialist.
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I have a Rheem 90 series. Gas comes on and ignites 8 sec

Customer Question

I have a Rheem 90 series. Gas comes on and ignites for about 8 sec then goes off. No error codes. Have replaced flame sensor, still same
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Is flame sensor postioned in flame good? If so unplug the connector at the board and make sure connection is clean and securely making contact at board

Customer: replied 1 year ago.
Flame sensor is in good position, i'll check the connection at the board thanks
Expert:  airheatman replied 1 year ago.

If the wire goes into a plug with several other wires, unplug it from the board and make sure the wire from flame senser id pushed into the plastic connector good so it contacts pin on board when plugged in.

Customer: replied 1 year ago.
Checked wire harness with a multi-meter, all check out good. Still no go
Expert:  airheatman replied 1 year ago.

At tis point I suspect board is defective, not sensing flame