Heater smokes

Step 1: Exhaust pipe

Check exhaust pipe for damage (cross section reduced)

Possible defect	Remedy
Mechanical damage	Install new exhaust pipe
Partially blocked	Clean exhaust pipe

Step 2: Fuel pump

Check delivery quantity of fuel pump

Possible defect	Remedy
Excessive fuel	Correctly adjust delivery quantity

Step 3: Combustion air intake

Check combustion air intake for free passage (visual check).

Possible defect	Remedy
Intake blocked	Clean combustion air intake

Step 4: Combustion air blower motor

Check combustion air blower motor speed.

Possible defect	Remedy
Battery voltage too low	Charge battery
Blower fan loose (chafes)	Remove combustion air blower, secure blower fan (note air gap of .039”/1 mm) and install new blower fan if necessary
Speed is not attained at nominal voltage (6400-7100 rpm)	Remove motor and check, install new one if necessary