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IHAVE AN ERROR 3.9 ON MY MACHINE THAT i DON'T KNOW WHAT TO…

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iHAVE AN ERROR 3.9 ON...
iHAVE AN ERROR 3.9 ON MY MACHINE THAT i DON'T KNOW WHAT TO DO!
Submitted: 3 years ago.Category: HVAC
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Answered in 3 days by:
6/6/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 3 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,155
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Hello,
are there any fumes being drawn into the unit?...small area?....and does it clear/reset wen unplugged/plugged in
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