I'm trying to track down why my Payne PG95SAS is giving me a code 33. It's been installed and worked perfect for around 5 years and just stopped heating. First code I found was 34 which I fixed by replacing the flame sensor. Now I'm getting code 33 5-6 minutes after the flame fires up.
33 LIMIT CIRCUIT FAULT – Indicates the limit, flame rollout is open. Blower will run for 4 min. or until open switch remakes whichever is longer. If open longer than 3 min, code changes to lockout #7. If open less than 3 min. status code #4 continues to flash until blower shuts off. Flame rollout switch requires manual reset. Check for:
Loose blower wheel.
Defective switch or connections.
Dirty filter or restricted duct system.
Improper gas input adjustment.
Improper limit switch or no gasket unless noted on switch
I replaced the filter (which was around 2 weeks old) with the least restrictive one I could find.
All of the output vents are open
I put a multimeter on the high limit switch and it is showing 0-1 ohms until right after the system goes into the error. It shows around 100 ohms after it errors.
I changed the blower speed taps to the highest CFM.
If I open the output side of the system (access to the AC coil) it still errors.
If I open the blower door and hold down lockout it doesn't error, at least for the approx 15 minutes I ran it with the door open.
Not sure what else I could check/test? Throw a new high limit switch in?
Thank you!
33 LIMIT CIRCUIT FAULT – Indicates the limit, flame rollout is open. Blower will run for 4 min. or until open switch remakes whichever is longer. If open longer than 3 min, code changes to lockout #7. If open less than 3 min. status code #4 continues to flash until blower shuts off. Flame rollout switch requires manual reset. Check for:
Loose blower wheel.
Defective switch or connections.
Dirty filter or restricted duct system.
Improper gas input adjustment.
Improper limit switch or no gasket unless noted on switch
I replaced the filter (which was around 2 weeks old) with the least restrictive one I could find.
All of the output vents are open
I put a multimeter on the high limit switch and it is showing 0-1 ohms until right after the system goes into the error. It shows around 100 ohms after it errors.
I changed the blower speed taps to the highest CFM.
If I open the output side of the system (access to the AC coil) it still errors.
If I open the blower door and hold down lockout it doesn't error, at least for the approx 15 minutes I ran it with the door open.
Not sure what else I could check/test? Throw a new high limit switch in?
Thank you!
