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I have a Rheem Criterion II Gas furnace. It is not igniting.  When I switch the thermostat to "heat" - the furnace doesn't not start.  There are 2 green lights - one is one and the other is blinking.  The filter is clean and the connections seem intact...any ideas?

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  • witchratt Dec 22, 2008

    I have the exact same problem as above and would appreciate any suggestions. Thanks!

  • witchratt Dec 22, 2008

    This is a followup to my previous post: I have also tried putting in a new thermostat and I still have the same result. Thanks again.

  • dmgarcia326 Mar 25, 2009

    I also have the same problem with the Criterion II. The ignitor sparks but won't light the pilot once in a while. Usually by the second time it will light. However, my HVAC company told me I should get it fixed. they first replaced the motherboard, which didn't solve the problem. They then replaced the gas valve, which didn't solve the problem. They then came over and "made the spark bigger." that also did not solve the problem. That tech told me that is the way these ignitors work. My furnace is less that 5 years old so is still under warranty. The parts were paid for but I had to pay $200 labor. I had them come back again after we had some extensive remodeling. The HVAC guy told me it was because there was dust from the remodeling. I am having another firm come tomorrow and clean and check it. I have thought all along if the ignitor is not starting the furnace, it is logical to me that the ignitor would be the problem. We will see what a different HVAC firm says tomorrow. I will no longer use Golden Seal that charged me, but did not fix my furnace. I feel they were just throwing parts at it. Any suggestions would be appreciated.

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Roscoe007 shouldnt speak unless he knows what he is talking about, as a heater installer i am telling you the ignitor needs to be replaced, the very fact that the ignitor does light for about 30 sec than goes out rules out any issue with the themostat, replace the ignitor!

Posted on Dec 28, 2008

  • leeCA Jan 13, 2011

    I found that the preasure switch is the problem if the igniter is not. Take the igniter in the garage and put 110 v to it-if it ignites - check the preasure switch (little round thing with the rubber hose attached. Disconnect blow and **** - should hear clicking. if not replace it - it should then work. Part is $ 27 depending on the furnace.

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Hi Welcome to fixya.com
you have a Rheem Criterion ii Gas Furnace thats not ignighting if you have a digital thermostate make sure batteries are ok. Im now assuming you have the heater door on when your trying to start the furnace ,because there are safety door switches.. if you have the door on .It sounds like the thermostat is bad ,it will start then run for 30 secs and go off...you retry exact same results..goes on for 30 secs goes off...I would say thermostat If it is digital remove it and try to resnap it in 1st. Please Remember to leave me some Positive feedback! Thankyou...

Posted on Dec 17, 2008

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Same problem
If I lose power in the middle of a burn it will do as described.
Powering down the furnace and powering it back up fixes it.
Seems like a software issue.
Rheem is hard to deal with.

Posted on Oct 20, 2009

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PROBLEM #1 - HOT SURFACE IGNITOR DOES NOT GLOW RED

(Remember to wait for purge time, 17/34 seconds, on models so equipped).

Possible causes

A. No main power

B. Faulty transformer

C. Faulty thermostat

D. Faulty limit switch

E. Faulty blower interlock switch

F. Faulty hot surface ignitor

G. Faulty ignition control

Solution

Step #1

Perform normal system checks of main power, transformer, thermostat, limit

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Step #2

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PROBLEM #2 - IGNITOR GLOWS RED BUT MAIN BURNER

WOULDN'T LIGHT

Possible causes

A. Improper ignitor alignment

B. Faulty ignition control

C. Faulty gas valve

D. High inlet gas pressure

E. Polarity reversed

F. No earth ground

Solution

Step #1

Check for availability of gas at gas valve. Make sure the manual valve

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Step #2

Check proper polarity of "NEUT" and "120" on the ignition control by reversing

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Step #3

Check for proper ignitor position.

Step #4

Check for a good earth ground by using a meter connected between L1

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CAUTION POLARITY MUST BE OBSERVED

Step #5

Check for 24 volts at the gas valve terminals; "1" and "2" on a 7200 series,

"M" and "C" on a 7100 series, "TH" and "TR" on a 7000 series. If yes,

check wire integrity or change the gas valve. If no, change the 780 series
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Thanks for choosing FixYa,
Kelly

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