Desa SPC-21PHTSA - Manual (Page 9)

www.desatech.com 114082-01C 9
TROUBLESHOOTING
WARNING: Turn off heater and let cool before servicing. Only a
qualified service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
Note: All troubleshooting items are listed in order of operation.
POSSIBLE CAUSE
1. Ignitor electrode positioned
wrong
2. Ignitor electrode broken
3. Ignitor electrode not con-
nected to ignitor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
1. Control knob not fully pressed in
2. Control knob not pressed in
long enough
3. Safety interlock system has
been triggered
4. Thermocouple connection
loose at control valve
5. Pilot flame not touching
thermocouple, which allows
thermocouple to cool, caus-
ing 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 damaged
7. Control valve damaged
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Replace ignitor cable
6. Replace piezo ignitor valve
assembly
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. Hand tighten until snug, then
tighten 1/4 turn more
5. A) Replace propane/LP gas
cylinder
B) Clean ODS/pilot (see
Cleaning and Maintenance ,
page 7) or replace ODS/pilot
assembly
6. Replace pilot assembly
7. Replace control valve
1. Clean burner orifice (see Clean-
ing and Maintenance, page 7)
or replace burner orifice
2. Replace propane/LP gas
cylinder
1. Replace propane/LP gas
cylinder
2. Clean burner orifice (see Clean-
ing and Maintenance, page 7)
or replace burner orifice
OBSERVED PROBLEM
When ignitor button is actuated,
there is no spark at ODS/pilot
ODS/pilot lights but flame
goes out when control knob is
released
Burner does not light after ODS/
pilot is lit
Delayed ignition of burner