www.desatech.com 114248-01B
8
SYMPTOM
Burner fails to light
Pilot lights but goes out when
automatic control valve button
is released
Burn rate is low
POSSIBLE CAUSE
1. Gas supply valve closed
2. Ex cess -fl ow ch eck va lve
closed (propane/LP units
only)
3. Blockage in burner orifice
4. Pie zo igni tion sy stem no t
sparking
1. Not enough warm-up time
2. Low gas pressure
3. Thermocouple loose or needs
to be replaced
4. Automatic control valve needs
to be replaced
1. Main burner valve not fully
open
2. Plugged gas orifices
3. Low gas pressure
4. Low fuel supply
REMEDY
1. Open gas supply valve slowly
2. Close propane supply valve
on propane tank and reopen
slowly
3. Replace burner orifice
4. Assure ignitor electrode gap is
5.0 mm (.195 in). Check wire
lead for damage Replace piezo
ignitor and/or ignitor electrode
as necessary. Do not bend elec-
trode, this may cause breakage
1. Relight, hold automatic control
valve button in 45 seconds
2. Check for proper gas supply
3. Tighten connection or replace
thermocouple
4. Replace automatic control
valve
1. Fully open main burner valve
by pushing in control knob
and turning counterclockwise
towards HIGH position until
it stops
2. Replace gas orifice
3. Check gas supply; check
regulator output
4. Consult gas supplier to deter-
mine adequate supply. If using
propane/LP gas, the tank could
be empty
TROUBLESHOOTING