F-400T TROUBLESHOOTING ANALYSIS:
PROBLEM:
HEATER WILL NOT LIGHT
POSSIBLE CAUSE:
Air switch improperly set.
REMEDY:
Use centre adjusting screw to set
air switch.
Turn clockwise to increase sensitivity,
turn counter clockwise to decrease
sensitivity.
POSSIBLE CAUSE:
Blockage in copper inlet tubes.
REMEDY:
Disconnect tubes from air switch. Use
high pressure air to clean any debris
that my block the airflow.
POSSIBLE CAUSE:
Faulty Switch.
REMEDY:
Replace Switch.
POSSIBLE CAUSE:
Rear of heater blocked.
REMEDY:
Ensure rear of heater is unobstructed
and proper rear clearances are
maintained. (see approval label)
