If it's an updraft, filter may be at bottom of unit. Filters are usually installed in the return air side of the system. If you have a return air plenum it may be under a removable plate cover. Also check you return air grill inside your house, filter may be inside this grill,which have opening latches.
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look in you return air ducting either by unit or return grid --------- https://www.questargas.com/ForEmployees/qgcOperationsTraining/Furnaces/Rheem_RGRM_RGTM.pdf
Rheem furnace error code 68 is a mechanical relay system which signals the blower motor to stop because it has not received a signal from the thermocouple.
Jul 20, 2022
I'm not familiar with the Rheem Corsair gas furnace, but the filter will be somewhere, filtering the return air. Is the furnace installed as an upflow, down flow or horizontal? Locate the blower door, open it up then work your way back on the duct that is returning air to the blower. Sometimes homes will have a filter return grill in a hallway ceiling. The grill has a couple nuts that can be removed, the grill swings down and houses the filter.
? 1:22
https://www.youtube.com/watch?v=fBJ3r9MUa-U
Nov 29, 2011 - Uploaded by RochNoure
A Furnace Flame Sensor is a safety device that reads the temperature and ... easy fix, but the furnace is ...
? 5:53
https://www.youtube.com/watch?v=Bx1pXONg2Oc
Dec 12, 2012 - Uploaded by grayfurnaceman
Troubleshoot the ignitor of the Rheem RGDA model gas furnace.... Jun Sim 5 months ago ... My lennox ...Missing: lx2000
? 0:47
https://www.youtube.com/watch?v=yOSk6qvpWbA
Jan 7, 2010 - Uploaded by Work12Progress
Rheem Criterion II gas furnace model # RGPH-07EAMGR. When a call for heat is made t wo green led's ...Missing: lx2000
Oct 19, 2004 - 25 posts - 9 authors
After a certain amount of time of not running, the heater will refuse to kick back on. ... 2 flashes, then a 2 second pause = pressure switch is open. What do .... On LP gas furnaces, the spark starts and the gas valve opens. ... Buffing them up with a little steel wool (5 minute job) is a good annual PM thing to do.
On a upflow model, the factory location for the air filter is just below the blower. Remove the front furnace doors to get to it.
If it is a downflow furnace, remove both furnace doors, and look inside the blower area, they will be sitting above the blower. Usually 2 air filters, in a "V" formation and are sometimes hard to get to.
If you do not find the filters here, someone has removed them or they may have been relocated to the return air grill, a large grill, usually located in the hallway or higher up on the wall.
If the Rheem factory air filter is still being used, it will be a black plastic frame and the filter area will look like a window screen.
Good luck and have a great day.
Paul
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!
Your best option is to contact your nearest wheather king/Rheem dealer. They may have replacements. The filter store online, they offer any size and cheap too!
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