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Member Since 18 May 2007
Offline Last Active Feb 22 2013 06:52 PM

Topics I've Started

Rheem Classic 90 .. burners for 7 seconds then stops

19 February 2013 - 12:08 AM

Rheem Classic 90 Furnace

This unit is 12.5 years old with zero problems till a day or two ago. Now we are getting no heat


Here is the current sequence

  1. The thermostat is calling for heat
  2. Draft blower starts
  3. It appears to have a sparking igniter and that goes off
  4. the main burners fire
  5. About 6 seconds later, the main burners shut down
  6. Waits about 30 seconds
  7. Sparking igniter goes off
  8. the main burners fire
  9. About 6 seconds later, the main burners shut down
  10. Blower motor starts and runs for 3 minutes then the above cycle repeats then it enters a 1hr lockout.

Troubleshooting so far ...

The two Green LEDs are solid ON
The Yellow LED is OFF

The flame sensor has been cleaned and there is ZERO build up on it.
Continuity of the flame sensor wire has been tested and confirmed
Current generated by the flame sensor indicates less than 1.5 uAmps on initial burner fireup but within about 2 seconds it is back to zero.

I've checked both pressure switches (one for the drain and one of the vent) and they both read ZERO volts for the entire cycle.


Any suggestions would be greatly appreciated. Thanks very much.


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