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Rheem criterion ii troubleshooting

Asked Dec 30, 2009, 01:41 PM — 22 Answers
I have a Rheem Criterion II gas furnace, that quit working. I checked it out, and found that the ignighter would come on, the gas would start, and then it would shut off. Figured it was the flame sensor. Before I could sand or replace it, it quit even doing that.

I didn't get voltage off the transformer, so I replaced that, and the flame sensor. Now, all I get is the right most green light on the controller board. The middle green light and the amber light don't light.

Does this mean a new controller board?

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22 Answers
KC13's Avatar
KC13 Posts: 2,567, Reputation: 514
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#2

Dec 30, 2009, 05:08 PM
Check the thermostat wire connections at the furnace - perhaps one or more broke off while replacing the transformer. If not, try removing the thermostat & connecting the "R" & "W" wires together. If the unit starts/runs, the problem is the thermostat.
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#3

Dec 30, 2009, 05:43 PM
Tried connecting the "r" & "w" wires together, and still nothing. Next?
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#4

Dec 30, 2009, 07:53 PM
Quote:
Originally Posted by ;
Check the thermostat wire connections at the furnace - perhaps one or more broke off while replacing the transformer.
Did you check this too?
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jross's Avatar
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#5

Dec 30, 2009, 07:56 PM
Yes. Wires good.
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KC13's Avatar
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#6

Dec 30, 2009, 08:11 PM
Look for a label, usually inside the blower area, with a list of codes & instructions. See if there are any useful hints or suggestions regarding the status light(s).
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jross's Avatar
jross Posts: 12, Reputation: 10
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#7

Dec 30, 2009, 08:27 PM
Nothing but a wiring diagram. Looked for the status light key first. :-)
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KC13's Avatar
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#8

Dec 30, 2009, 08:35 PM
If you can provide the complete model #, I may be able to come up with something.
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jross's Avatar
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#9

Dec 30, 2009, 08:53 PM
Rgdg10ebrjr, thanks!
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KC13's Avatar
KC13 Posts: 2,567, Reputation: 514
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#10

Dec 30, 2009, 08:59 PM
Peek here: Main Furnace Control Circuit Board Used in (Rheem, Ruud, Robertshaw): Best Buy Heating and Air Conditioning Does this look like your circuit board? Do you have a voltmeter?
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