Specifications

SECTION I
TROUBLESHOOTING GUIDE
Should symptoms appear during the operation of your heater, refer to the chart below. If you are unable to restore
normal operation, contact your MPI dealer for service.
SYMPTOM
CAUSE
REMEDY
Heater does not go on with
operation switch.
Heater does not ignite.
Heater extinguishes after
lighting.
(Note 2)
Timer is in Auto.
AC cord is disconnected from
wall outlet. Power failure.
Air in gas pipe.
Flue pipe obstructed.
Louver obstructed.
Press Auto Button again.
Check plug and power source.
Reset circuit breaker.
Purge air. Repeat starting
procedure.
Clear obstruction.
Erratic changes in room
temperature. (Slight
differences in room
temperature are normal.)
Poor location of heat sensor.
Poor air movement.
Relocate the sensor.
Make sure clearances are kept around
unit.
Add room fans to better circulate air
throughout area.
Automatic timer does not
start heater.
Operation switch is not
in the "ON" position.
Timer is in Manual.
Timer improperly
programmed.
Power interruption.
Depress operation button to "ON"
position.
Press Auto Button.
See "Programming for Automatic
Operation" , page 20.
See "Loss of Power", page 21.
Poor flame, sounds of
combustion, soot at the
rear of the heater.
Loose flue pipe. Allow heater to cool completely;
tighten all connections.
Soot on inside of burner
window or exhaust ports
of flue pipe.
Obstruction of combustion
air intake system or
combustion fan failure.
Inspect air intake system and air
supply elbow for blockage. Clean with
a brush, if necessary, and carefully
reconnect.
Heater switches from
automatic to manual operation:
display window shows 88: 88.
Power interruption; automatic reset. See "Loss of Power"
page 21.
NOTE: Several of the symptoms mentioned above may a/so be signs that your unit is due for routine maintenance,
especially if it is several years old. Contact your Monitor dealer for an appointment.
Note 2: The GF is equipped with a blocked vent shut-off system to safely shut off the unit if the vent becomes blocked
with snow or other obstruction. In the event that the GF unit fails to operate, contact an authorized service
technician or a qualified service agency.