www.fmiproducts.com
56131J
31
TROUbLESHOOTING
WARNING: Turn off heater, disconnect power if applicable and
let cool before servicing. Only a qualified service person should
service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
pilot. This can damage pilot unit.
Note: The two most common causes of malfunctioning gas appliances are loose wiring con-
nections and construction debris clogging pilot and/or control valve filter.
Note: Before troubleshooting the system make sure gas shut off valve is open.
MILLIVOLT SYSTEM
REMEDY
1. Check to see if you have
gas supply
2. Hold control valve in the
PILOT position for 2 to 3
minutes to purge air. If you
smell gas stop and wait for
a few minutes before trying
to light the fireplace
3. Remove debris and dirt,
inspect and clean any other
possible obstructions
4. Contact your gas supplier
5. Refer to section on pilot
lighting
6. Have a qualified technician
replace pilot line
7. Replace control valve (see
Replacement Parts and Ac-
cesssories
, page 34)
8. Tighten thermocouple or
replace
1. Check wiring connection.
Refer to
Wiring Diagrams
,
page 33
1. Check electrical connec-
tions
2. Recheck problem
Pilot Will
Not Stay Lit
1. Clean and adjust pilot flame
for maximum flame im-
pingement on thermopile
1. Replace thermopile
POSSIbLE CAUSE
1. No gas supply, or shutoff
valve is OFF
2. Air in gas line
3. Construction debris clog-
ging pilot orifice
4. Low gas pressure
5. Control valve knob is not on
the PILOT position
6. Kinked pilot line
7. Bad valve
8. Bad thermocouple or loose
connection
1. Loose wiring on thermopile
to regulator valve. No mil-
livolt current being sent to
regulator
1. Wall switch wires defec-
tive
2. Thermopile generator or
sensor not generating suf-
ficient voltage
1. Pilot flame may be too low,
causing safety pilot to “drop
out”
1. Millivolt output on thermo-
pile too high
ObSERVED PRObLEM
Pilot will not light
Pilot will not stay lit
No gas to burner, although wall
switch and valve are set to the
ON position
Frequent pilot outage
Pilot goes out when wall switch
is on
