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110720-01A
17
17
For more information, visit www.desatech.com
For more information, visit www.desatech.com
OBSERVED PROBLEM
Burner does not light after ODS/pilot is lit
Delayed ignition of burner
Burner backfiring during combustion
Burner plaque(s) does not glow (Infrared
models only)
Yellow flame during burner combustion
Slight smoke or odor during initial operation
Heater produces a whistling noise when
burner is lit
Heater produces a clicking/ticking noise
just after burner is lit or shut off
REMEDY
1. Clean burner orifice (see Cleaning and
Maintenance, page 15) or replace burner
orifice
2. Contact local natural or propane/LP gas
company
1. Contact local natural or propane/LP gas
company
2. Clean burner orifice (see Cleaning and
Maintenance, page 15) or replace burner
orifice
1. Clean burner orifice (see Cleaning and
Maintenance, page 15) or replace burner
orifice
2. Replace burner
3. Replace gas regulator
1. Turn control knob until it locks at de-
sired setting
2. Contact local natural or propane/LP gas
company
3. Replace burner
1. Check burner for dirt and debris. If
found, clean burner (see Cleaning and
Maintenance, page 15)
2. Contact local natural or propane/LP gas
company
3. Replace gas regulator
1. Problem will stop after a few hours of
operation
1. Turn control knob to LOW position and
let warm up for a minute
2. Operate burner until air is removed from
line. Have gas checked by local natural
or propane/LP gas company
3. Observe minimum installation clear-
ances (see Figure 4, page 7)
4. Clean burner (see Cleaning and Mainte-
nance, page 15) or replace burner orifice
1. This is common with most heaters. If
noise is excessive, contact qualified ser-
vice person
POSSIBLE CAUSE
1. Burner orifice is clogged
2. Inlet gas pressure is too low
1. Manifold pressure is too low
2. Burner orifice is clogged
1. Burner orifice is clogged or damaged
2. Burner damaged
3. Gas regulator defective
1. Control knob set between locked positions
2. Inlet gas pressure is too low
3. Plaque damaged
1. Not enough air
2. Inlet gas pressure is too low
3. Gas regulator defective
1. Residues from manufacturing processes
1. Turning control knob to HIGH position
when burner is cold
2. Air in gas line
3. Air passageways on heater blocked
4. Dirty or partially clogged burner orifice
1. Metal expanding while heating or con-
tracting while cooling
TROUBLESHOOTING
Continued
TROUBLESHOOTING