Desa CD36RN Owner's Operation And Installation Manual page 43

OBSERvED PROBLEM
Ignitor will not spark or pilot
will not light
Pilot will not stay lit
Frequent outage of main
burner and pilot after com-
plete ignition sequence.
116035-01J
TROUbLEShOOTING
ELECTRONIC IGNITION
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. Kinked pilot line
6. Control valve is not opening
7. No power to unit or the igni-
tion module
1. Loose wiring on ignitor wire
to ignition module and/or
poor ground to ignition
module
2. Pilot flame too low to sense
1. Pilot flame may be too low
to sense flame causing igni-
tion module to shut down
2. Improper venting, exces-
sive blockage, or high wind
conditions. Over drafting of
straight (no offset) vertical
vent systems over 15 feet
in height
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REMEDY
1. Check to see if you have gas
supply and that equipment
shutoff valve is opened
2. Repeat lighting procedure
several times to purge all air
out of lines. If after repeated
attempts appliance does not
light, call for qualified service
and repair
3. Remove debris and dirt, and
inspect and clean any other
possible obstructions
4. Contact your gas supplier to
check pressure
5. Have a qualified technician
replace pilot line
6. Replace control valve (Refer to
Replacement Parts, page 45)
7. Check that main power is on
and that wire connections are
made correctly to the ignition
model (see Wiring Diagrams,
page 25). Check for 24 VAC
at the secondary side of the
transformer. If 24 VAC is
present, and the module does
not operate, have the module
replaced otherwise have the
transformer replaced
1. Check wiring connection.
Refer to wiring diagram (see
Wiring Diagrams, page 25)
and/or check ground wire to
ignition module
2. Clean and adjust pilot burner
and check gas supply and
inlet pressure to unit Note:
Have a qualified technician
replace pilot assembly if
broken or corroded
1. Clean and adjust pilot flame
for maximum flame across
sensor rod.
2. Have vent system inspected,
including the termination cap.
Remove any restriction or
obstruction. Add restrictor
plate model VR-58 in straight
vertical systems over 15 feet
(if not previously installed)
43