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107887-01E
For more information, visit www.desatech.com
For more information, visit www.desatech.com
20
TROUBLESHOOTING
OBSERVED PROBLEM
ODS/pilot lights but flame goes out when
control knob is released
Burner(s) does not light after ODS/pilot is lit
Delayed ignition of burner(s)
Burner backfiring during combustion
Burner plaque(s) does not glow
Slight smoke or odor during initial operation
Heater produces a clicking/ticking noise
just after burner is lit or shut off
REMEDY
1. Press in control knob fully
2. After ODS/pilot lights, keep control
knob pressed in 30 seconds
3. Fully open equipment shutoff valve
4. Hand tighten until snug, then tighten 1/4
turn more
5. A) Contact local natural or propane/LP
gas company
B) Clean ODS/pilot (see Cleaning and
Maintenance, page 17) or replace ODS/
pilot assembly
6. Replace pilot assembly
7. Replace control valve
8. Wait one minute for safety interlock sys-
tem to reset. Repeat ignition operation
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 17) or replace
burner orifice(s)
2. Contact local natural or propane/LP gas
company
1. Contact local natural or propane/LP gas
company
2. Clean burner orifice(s) (see Cleaning
and Maintenance, page 17) or replace
burner orifice(s)
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 17) or replace
burner orifice(s)
2. Replace burner
3. Replace gas regulator
1. Replace burner
2. Contact local natural or propane/LP gas
company
3. Turn control knob until it locks at de-
sired setting
1. Problem will stop after a few hours of
operation
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
POSSIBLE CAUSE
1. Control knob not fully pressed in
2. Control knob not pressed in long enough
3. Equipment shutoff valve not fully open
4. Thermocouple connection loose at con-
trol valve
5. Pilot flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem 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
8. Safety interlock system has been trig-
gered (thermostat models only)
1. Burner orifice(s) is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice(s) is clogged
1. Burner orifice(s) is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Plaque damaged
2. Inlet gas pressure is too low
3. Control knob set between locked posi-
tions
1. Residues from manufacturing processes
1. Metal expanding while heating or con-
tracting while cooling
TROUBLESHOOTING
Continued