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I have a PG8MAA036070 furnace that the blower won't shut off.

Customer Question
It only shuts off when...
I have a PG8MAA036070 furnace that the blower won't shut off. It only shuts off when switch to off
Submitted: 2 years ago.Category: HVAC
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Answered in 5 minutes by:
7/23/2015
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,764
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified
Hello, there are only 2 choices....there is a short in the thermostat or thermostat wire....OR...the circuit board is bad. If you remove the green thermostat wire from the circuit board G terminal...and blower continues = bad board
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Customer reply replied 2 years ago
Ok I replaced digital to Mercury stat and still doing same. I ohm stat wire and ohm ok. So you telling me that if I disconnect the fan green wire from board and still runs then bad board. Could it be a dirty sensor or bad limit switch
Customer reply replied 2 years ago
It will shut off if stat is switch to off position
Customer reply replied 2 years ago
Hello
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
if it were a bad switch you would have no heating or cooling....if you have function but blower runs nonstop it is circuit board
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HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
does fan run non stop in auto?
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Customer reply replied 2 years ago
Yes it runs continuously on auto
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
May I ask how wires are attached in furnace and in thermostat (color to terminal)
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Customer reply replied 2 years ago
I disconnect low voltage from the board and stat ohm it out and ohm ok
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
ohm will only tell us if open, not shorted
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Customer reply replied 2 years ago
Board to stat
W-W
G-G
Y-Y and W condenser
R-R
Common R condenser
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
ok I am confused on "and W condenser R-R Common R condense" is red wire to R in stat and at boardwhite wire to w in stat and boardyellow to y in stat and boardgreen to g in stat and board Then the 2 wires from ac:one on Y with the thermostat yellow and one on C?
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Customer reply replied 2 years ago
Yes correct
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 2 years ago
thank you. If board were bad....the blower would not shut off when switched to off from auto. when blower is running nonstop just remove that green wire from g....if it stops it is in the wiring..if it does not it is in the board
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BillyHvac
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22,764
22,764 Satisfied Customers
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics

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