Desa Vanguard VN10T Owner's Operation And Installation Manual page 13

TROUBLESHOOTING
Continued
OBSERVED PROBLEM
Burner plaques do not light after ODS/pilot
is lit
Delayed ignition of burner plaques
Burner backfiring during combustion
Burner plaques do not glow
Slight smoke or odor during initial opera-
tion
Heater produces a clicking/ticking noise
just after burner is lit or shut off
102490
POSSIBLE CAUSE
1. Burner orifice(s) is clogged
2. Burner orifice(s) diameter is too small
3. 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. Inlet gas pressure is too low
3. Burner damaged
4. Gas regulator defective
1. Plaque damaged
2. Inlet gas pressure is too low
3. Control knob set too low
1. Residues from manufacturing processes
1. Metal expanding while heating or con-
tracting while cooling
13
OWNER'S MANUAL
REMEDY
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 11) or replace
burner orifice(s)
2. Replace burner orifice(s)
3. Contact local natural gas company
1. Contact local natural gas company
2. Clean burner orifice(s) (see Cleaning
and Maintenance, page 11) or replace
burner orifice(s)
1. Clean burner orifice(s) (see Cleaning
and Maintenance, page 11) or replace
burner orifice(s)
2. Contact local natural gas company
3. Replace burner
4. Replace gas regulator
1. Replace burner
2. Contact local natural gas company
3. Turn control knob to higher 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
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