Desa 35-R - Manual (Page 7)

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SYMPTOM
Burner fails to light
Pilot lights but goes out when
automatic control valve button
is released
Burn rate is low
Burner lights but goes out when
button is released
POSSIBLE CAUSE
1. Gas supply valve closed
2. Excess-flow check valve
closed
3. Blockage in burner orifice
4. Piezo ignition system not
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. Plugged gas orifices
2. Low gas pressure
3. Low fuel supply
1. Loose wires on tip over
switch
2. Loose or broken lead wire
3. Loose or mislocated thermo-
couple wire
4. Defective thermocouple
5. Defective control
6. Defective tip over switch
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 (0.195 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. Replace gas orifice
2. Check gas supply; check
regulator output
3. Consult gas supplier to deter-
mine adequate supply. Tank
could be empty
1. Tighten wires on tip over
switch
2. Tighten or repair wire
3. Tighten thermocouple. Make
sure thermocouple is located
correctly between reverbera-
tor and grid
4. Replace thermocouple
5. Replace control
6. Replace tip over switch
TROUBLESHOOTING
WARNING: Never attempt to service heater while it is connected
to propane supply, operating or hot. Severe burns can occur.