Possible Cause
Possible Solution
No power to the heater
Check and reset breaker
The blower belt is broken
Replace the belt
The pilot light is out (gas only)
Reset the pilot light
Possible Cause
Possible Solution
The filter is dirty
Replace the filter
The registers are dirty
Clean the registers
A register is closed
Check and open all registers
Blocked ductwork
Check and clear ductwork
Separated ductwork
Repair with duct tape
Duct damper position problem
Adjust room dampers
Blower belt is loose
Tighten blower belt
Possible Cause
Possible Solution
The filter is dirty
Replace the filter
The ducts are dirty
Have the ducts professionally cleaned
Heat exchanger may be cracked or damaged
Call a qualified service provider
Possible Cause
Possible Solution
A pulley may be loose
Check and tighten all pulley screws
Blower motor belt may be worn out
Replace the belt and adjust the tension
Blower motor bearings are dry
Oil the bearings
