Desa Tech CGN20T - Manual (Page 23)

23
103873
REMEDY
1. Turn on gas supply or
open manual shutoff
valve
2. Turn control knob to
PILOT position
3. Press in control knob
while in PILOT position
4. Continue holding down
control knob. Repeat
igniting operation until
air is removed
5. Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 22) or
replace ODS/pilot
assembly
6. Replace gas regulator
1. Press in control knob
fully
2. After ODS/pilot lights,
keep control knob
pressed in 30 seconds
3. Wait one (1) minute for
safety interlock system to
reset. Repeat ignition
operation
4. Fully open manual shut-
off valve
5. Hand tighten until snug,
then tighten 1/4 turn more
6. A) Contact local natural
gas company
B) Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 22) or
replace ODS/pilot
assembly
7. Replace thermocouple
8. Replace control valve
OBSERVED
PROBLEM
When ignitor button
is pressed, there is
spark at ODS/pilot
but no ignition
ODS/pilot lights but
flame goes out when
control knob is
released
POSSIBLE
CAUSE
1. Gas supply turned off
or manual shutoff
valve closed
2. Control knob not in
PILOT position
3. Control knob not
pressed in while in
PILOT position
4. Air in gas lines when
installed
5. ODS/pilot is clogged
6. Gas regulator setting is
not correct
1. Control knob not fully
pressed in
2. Control knob not
pressed in long enough
3. Safety interlock
system has been
triggered (Thermostat
models only)
4. Manual shutoff valve
not fully open
5. Thermocouple connec-
tion loose at control
valve
6. Pilot flame not touch-
ing thermocouple,
which allows thermo-
couple to cool, causing
pilot flame to go out.
This problem could be
caused by one or both
of the following:
A) Low gas pressure
B) Dirty or partially
clogged ODS/pilot
7. Thermocouple dam-
aged
8. Control valve damaged
TROUBLE-
SHOOTING
Continued
Continued