General topics about all things heating, ventilation, air conditioning and refrigeration.
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Turn off the main power for 30 minutes. That should reset the furnace control board. Read page 14 - " -.docs.*/idc/groups/pu ... a-91-1.pdf" I hope the URL isn't censored... it's the Installation Manual. I don't have the code for 33 so you need to watch the furnace go through its start-up sequence as listed on pg 14 and see where it fails.