Troubleshooting, Inspecting Burner, Symptom, Possible Cause

TROUBLESHOOTING INSPECTING BURNER

TROUBLESHOOTING

You may have further questions about this heater. If so, contact DESA Heating Products' Technical Service Department at 1-866-672-6040 or visit our web site at www.desatech.com.

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.	Propane supply valve closed on propane
		tank(s)
	2.	Blockage in burner/valve assembly
	3.	Piezo ignition system not sparking

1.Open propane supply valve slowly

2.Replace burner/valve assembly

3.Assure ignitor electrode gap is .120" (3.04 mm). Check wire lead for damage. Replace piezo ignitor and/or ignitor electrode as necessary

Burner lights but goes out when auto- matic control valve button is released

1.Not enough warm-up time

2.Low gas pressure

3.Thermocouple loose or needs to be re- placed

4.Automatic control valve needs to be replaced

1.Relight, hold automatic control valve button in 45 seconds

2.Check propane tank(s) for proper gas supply

3.Tighten connection or replace thermocouple

4.Replace automatic control valve assembly

Maximum burn rate is low	1.	Low gas pressure
	2.	Low fuel supply
	3.	Plugged gas orifices

INSPECTING BURNER

WARNING: Heater shell, top, and heated air from heater is very hot during operation. Gradually move in closer to heater to observe flame color. Do not touch heater shell or top. Do not get too close to heated air from heater. Severe burns could occur.

To check for correct burner flame, look through the ventilation holes in the top of the heater to see the burner flame. The burner flame should be mostly blue with slight yellow coloring on the ends. If the burner flame is mostly yellow, the primary air openings on the burner tube under the heater base may be blocked (see Figure 5).

1.Stop heater (see To Stop Heater on page 4) and let cool.

2.Turn heater over to locate the primary air openings on the burner tube (see Figure 5). Remove any debris blocking the primary air openings.

1.Check gas supply; check regulator output

2.Consult propane gas supplier

3.Replace burner assembly

Primary Air

Openings

Burner

Tube