Desa CDR3924NT Owner's Operation And Installation Manual page 21

OBSERvED pROBLEM
ODS/pilot lights but flame
goes out when control knob
is released
One or more burners do not
light after ODS/pilot is lit
Delayed ignition of one or
more burners
Burner backfiring during
combustion
122270-01D
TROUbLESHOOTING
Continued
pOSSIBLE CAUSE
1. Control knob not fully
pressed in
2. Control knob not pressed
in long enough
3. Safety interlock system
has been triggered
4. Equipment shutoff valve
not fully open
5. Pilot flame not touching
thermocouple, which al-
lows thermocouple 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
6. Thermocouple connection
loose at control valve
7. Thermocouple damaged
8. Control valve damaged
1. Inlet gas pressure is too
low
2. Burner orifice(s) clogged
3. M i s l o c a t e d c r o s s o v e r
tube
1. Manifold pressure is too
low
2. Burner orifice(s) clogged
3. M i s l o c a t e d c r o s s o v e r
tube
1. Burner orifice is clogged or
damaged
2. Damaged burner
3. Gas regulator defective
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REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep
control knob pressed in 30
seconds
3. Wait one minute for safety
interlock system to reset.
Repeat ignition operation
4. Fully open equipment shut-
off valve
5. A) Contact local natural or
propane/LP gas company
B) Clean ODS/pilot (see
Cleaning and Mainte-
nance, page 18) or replace
ODS/pilot assembly
6. Hand tighten until snug,
then tighten 1/4 turn more
7. Replace pilot assembly
8. Replace control valve
1. Contact local natural or
propane/LP gas company
2. C l e a n b u r n e r ( s ) ( s e e
Cleaning and Maintenance,
page 18) or replace burner
orifice(s)
3. Contact qualified service
person
1. Contact local natural or
propane/LP gas company
2. C l e a n b u r n e r ( s ) ( s e e
Cleaning and Maintenance,
page 18) or replace burner
orifice(s)
3. Contact qualified service
person
1. Clean burner (see Cleaning
and Maintenance, page 18)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
21