www.desatech.com
55173-G
1
TROUBLESHOOTING
ELECTRONIC IGNITION SYSTEM
Note:
Before troubleshooting the system, make sure the gas shutoff valve is ON.
The two most common causes of a malfunctioning gas appliance are:
1. Loose wiring connections
2. Construction debris clogging the pilot and/or gas control valve filter
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
POSSIBLE CAUSE
1. No gas supply or shutoff
valve is OFF
2. Construction debris clog-
ging pilot orifice
3. Low gas pressure
4. Control valve knob is not on
the PILOT position
5. Kinked pilot line
6. Bad valve
1. Loose wiring on thermopile
to regulator valve. No mil-
livolt current is being sent
back to regulator
2. If valve knob and wall switch
are in the ON position, prob-
able defective control valve
1. Wall switch wires defective
2. Thermocouple generator or
sensor not generating suf-
ficient voltage
1. Pilot flame may be too
low, causing safety pilot to
“drop out”
1. Output on flame sensor too
high
REMEDY
1. Check to see if you have gas
supply
2. Remove debris and dirt, in-
spect and clean any other
possible obstructions
3. Contact your gas supplier
4. Refer to section on pilot
lighting
5. Have a qualified technician
replace pilot line
6. Replace control valve (see
Replacement Parts and Acces-
sories
, page 19)
1. Check wiring connections.
Refer to wiring diagrams on
page 16
2. Have a qualified technician
replace valve (see
Replace-
ment Parts and Accessories
,
page 19)
1. Check electrical connections
and wires for continuity
2. See
Pilot will not stay lit
,
above
1. Clean and adjust pilot flame
for maximum flame impinge-
ment on thermopile
1. Replace flame sensor
