TROUBLESHOOTING

WARNING: Never attempt to service heater while it is connected to propane supply, operating or hot. Severe burns can occur.

SYMPTOM

POSSIBLE CAUSE

REMEDY

 

 

 

 

Burner fails to light

1. Gas supply valve closed

1.

Open gas supply valve slowly

 

2.

Excess-flow check valve

2.

Close propane supply valve

 

 

closed

 

on propane tank and reopen

 

3.

Blockage in burner orifice

 

slowly

 

3.

Replace burner orifice

 

4.

Piezo ignition system not

4.

Assure ignitor electrode gap is

 

 

sparking

 

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

 

 

 

 

Pilot lights but goes out when

1. Not enough warm-up time

1.

Relight, hold automatic control

automatic control valve button

 

 

 

valve button in 45 seconds

is released

2. Low gas pressure

2.

Check for proper gas supply

 

3.

Thermocouple loose or needs

3.

Tighten connection or replace

 

 

to be replaced

 

thermocouple

 

4.

Automatic control valve needs

4.

Replace automatic control

 

 

to be replaced

 

valve

 

 

 

 

Burn rate is low

1. Plugged gas orifices

1.

Replace gas orifice

 

2.

Low gas pressure

2.

Check gas supply; check

 

3.

Low fuel supply

 

regulator output

 

3.

Consult gas supplier to deter-

 

 

 

 

mine adequate supply. Tank

 

 

 

 

could be empty

 

 

 

 

Burner lights but goes out when

1. Loose wires on tip over

1.

Tighten wires on tip over

button is released

 

switch

 

switch

 

2.

Loose or broken lead wire

2.

Tighten or repair wire

 

3.

Loose or mislocated thermo-

3.

Tighten thermocouple. Make

 

 

couple wire

 

sure thermocouple is located

 

 

 

 

correctly between reverbera-

 

 

 

 

tor and grid

 

4.

Defective thermocouple

4.

Replace thermocouple

 

5.

Defective control

5.

Replace control

 

6.

Defective tip over switch

6.

Replace tip over switch

117296-01A

www.desatech.com

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Desa 35-R owner manual Troubleshooting, Symptom Possible Cause Remedy