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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22517
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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WeatherMaster 8000 blower won't turn on

Customer Question

Hi weatherMaster 8000 blower won't turn on. Thermostat on solid cool. Outside compression on. Paul
Submitted: 2 years ago.
Category: HVAC
Expert:  BillyHvac replied 2 years ago.
hello,

does blower run if thermostat fan switch is "on" instead of "auto"

Use reply
Customer: replied 2 years ago.

No. The blower doesn't come on whether on "auto" or "on." Shall I connect the R and G terminals on the circuit board to test if the blower comes on? I was reading another post and was thinking that could be a next step...

Customer: replied 2 years ago.
Relist: Other.
Taking too long for replies.
Expert:  BillyHvac replied 2 years ago.
the basic test is if the blower gets 120v or not.

120v present to motor but not running = bad motor
no 120v to motor = bad circuit board

R and G is supposed to close a blower relay...but you might as well skip right to the issue and test power to the motor
Customer: replied 2 years ago.

Thanks Billy. How would I test that on the WeatherMaster 8000? There seem to be 5 leads from the board to the blower - black, red, yellow, white, blue...

Expert:  BillyHvac replied 2 years ago.
in cooling you will want to test the black wire (while blower should be running)

One meter lead to black motor wire terminal and other meter lead to ground

Billy