BF33ST, BF33DX, BF39ST, BF39DX, BF45ST, BF45DX
TROUBLESHOOTING
GUIDE
HEATER (CONTINUED)
Problem
Cause
Solution
Service Manual
Reference
Blower running fast
Voltage selector switch is in
the wrong position
Select correct voltage
selector switch position
Page 3
Blower running
slow
Voltage selector switch is in
the wrong position
Select correct voltage
selector switch position
Page 3
NOISE
Problem
Cause
Solution
Service Manual
Reference
Dirty blower assembly
Clean blower assembly
Defective blower assembly
Replace heater motor/blower Page 22 - 25
Excessive noise
near the top of the
unit
Loose heater access panel
Secure heater access panel
Moving flame rod hitting or
rubbing against internal
components
Flame rod replacement
Page 13
Excessive noise
near the bottom of
unit
Defective flame motor
Replace flame motor
Page 13
