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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22673
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a Intertherm Model 901282. The heater coils will heat

Customer Question

i have a Intertherm Model 901282. The heater coils will heat but the fan will not run. The fan motor and the capacitor have been checked and seem to be good. Cant find the problem.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: yes have checked both
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: how do I check the relays?
Submitted: 11 months ago.
Category: HVAC
Expert:  BillyHvac replied 11 months ago.


My name is Billy.

If the heaters engage but not the blower then you have a bad sequencer switch. The sequencer is a stacked switch...first blower starts, then one bank heaters...then 2 or 3 if present...

If motor is good then the issue is sequencer relay

Expert:  BillyHvac replied 11 months ago.

Follow the black motor wire...the item it goes to is what is bad.