Hello - my Rheem Criterion II (old model) would not ignite the flame.It worked until a couple of days ago. When I open the cover and startthe furnace, the green LED is blinking twice then pause. According tolabel, the pressure switch is open. How can I fix this? Do I need toinstall a new pressure switch? Please advise.
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Re: Rheem Criterion II Furane would not ignite
What you need to do is take and inspect the hose that goes to the pressure switch and make sure that it is not dry rotted. if it is and the combustion blower is running then firsat try to cut the hose down and slip on a better piece of rubber. If not then replace the hose,
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Check for a low voltage relay that may be used to power the blower, see if operates. To check a blower motor directly, connect it directly to 120volts. (it might be a 3 speed blower with 4 wires connecting it, so check the wiring diagram)
Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.
rheems site is secure for dealers only but i can tell you. its a 3 ton unit 12 SEER R22 unit. The coil (rcga) is a 3 ton coil The AC is a 1999 and coil 1998. the # you have for the heater is accually just the honeywell gas valve. the model for the heater would be on the inside wall near the gas valve.
I have a Rheem Classic 80 furnace that would ignite but not stay lit. Cleaned the ignition sensor which was easy to get to and the flame sensor which was under the burner plate and it fired up and stayed lit. The flame sensor was about 6" under the burner plate. Easy to get out, but tough to get back in. Used the old piece of paper shim trick to get the screw to "stick" in the socket and it was much easier to position the screw and get it back where it belonged.
Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.
If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve. Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.