Desa Flame-Max VYD24 Operation And Installation Manual page 27

OBSERVED PROBLEM
ODS/pilot lights but flame
goes out when control knob
is released
Burner does not light after
ODS/pilot is lit
Delayed ignition of one or
both burners
Burner backfiring during
combustion
113093-01H
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. Thermopile leads discon-
nected or improperly con-
nected (Remote-Ready
Models Only)
4. Burners will not come on in
remote position (Remote-
Ready Models Only)
1. Manifold pressure is too low
2. Burner orifice(s) clogged
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 Maintenance,
page 24) 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 24) or replace burner
orifice(s)
3. Reconnect leads (see Wir-
ing Diagram, page 25)
4. Replace battery in transmit-
ter and receiver
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 24) or replace burner
orifice(s)
1. Clean burner (see Cleaning
and Maintenance, page 24)
or replace burner orifice
2. Replace damaged burner
3. Replace gas regulator
27