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Old 04-05-2012, 01:42 PM   #1
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day and night 355mav furance has a error code od 33


I have all new ducting and a new circuit board and I still get code 33 and it wont run in low speed. what is my problem?

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Old 04-05-2012, 01:57 PM   #2
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day and night 355mav furance has a error code od 33


How about some furnace history and why the duct and board were changed?

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