Ask Me Help Desk - Furnace works up to 67 degrees but error code 33 if set to 68 or higher.

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- - Furnace works up to 67 degrees but error code 33 if set to 68 or higher. (https://www.askmehelpdesk.com/showthread.php?t=777866)

Furnace works up to 67 degrees but error code 33 if set to 68 or higher.

Hi,
I have done the following
- replaced the air filter
- checked for blocked pipes
- replaced flame rollout switch
- Fan is secure and spins

Everything works fine until I increase the temp above 67... what the heck?

Thanks in advance for any suggestions.

Jay

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