Troubleshooting

WARNING: Turn off heater and let cool before ser- vicing. Only a qualified service person should service and repair heater.

CAUTION: Never use a wire, needle, or similar object

to clean pilot. This can damage pilot unit.

Note: All troubleshooting items are listed in order of operation.

The two most common causes of a malfunctioning gas appliance are:

1. Loose wiring connections

2. Construction debris clogging the pilot and/or gas control valve filter

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Ignitor will not spark or pilot will not light

1.

No gas supply, or shutoff valve is OFF

1.

Check to see if you have gas supply and

 

2.

Air in gas line

2.

that equipment shutoff valve is opened

 

Repeat lighting procedure several times

 

 

 

 

to purge all air out of lines. If after re-

 

 

 

 

peated attempts appliance does not light,

 

3.

Construction debris clogging pilot orifice

3.

call for qualified service and repair.

 

Remove debris and dirt, inspect and

 

4.

Low gas pressure

4.

clean any other possible obstructions

 

Contact your gas supplier to check

 

5.

Kinked pilot line

5.

pressure

 

Have a qualified technician replace pilot

 

6.

Control valve knob is not opening

6.

line

 

Replace control valve (Refer to Replace-

 

7.

No power to unit or the ignition module

7.

ment Parts, page 28)

 

Check that main power is on and that

 

 

or power transformer is bad

 

all wire connections are made correctly

 

 

 

 

to the ignition model (see Wiring Dia-

 

 

 

 

gram, page 22). Check for 24 VAC at the

 

 

 

 

secondary side of the transformer. If 24

 

 

 

 

VAC is present, and the module does not

 

 

 

 

operate, have the module replaced oth-

 

8.

Vent damper not fully open

8.

erwise have the transformer replaced.

 

Open vent damper until fully locked in

 

 

 

 

OPEN position

Pilot will not stay lit

1.

Loose wiring on ignitor wire to ignition

1.

Check wiring connection. Refer to Wir-

 

 

module and/or poor ground to ignition

 

ing Diagram, page 22, and/or check

 

2.

module

2.

ground wire to ignition module

 

Pilot flame too low to sense

Clean and adjust pilot burner and check

 

 

 

 

gas supply and inlet pressure to unit

 

 

 

 

Note: Have a qualified technician replace

 

 

 

 

pilot assembly if broken or corroded

No gas to burner, although wall switch and

1.

Wall switch wires defective or too long

1.

Check electrical connections

valve are set to the ON position

 

 

 

 

 

 

 

 

 

Frequent pilot outage

1.

Pilot flame may be too low, causing

1.

Clean and adjust pilot flame for maximum

 

2.

safety pilot to “drop out”

2.

flame impingement on thermopile

 

Improper venting or excessive blockage

Have the vent system inspected, includ-

 

 

 

 

ing the termination cap. Remove any

 

 

 

 

restriction or obstruction

26

www.desatech.com

108860-01D

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Page 26
Image 26
Desa (V)T32EN installation manual Troubleshooting, To clean pilot. This can damage pilot unit
Page 25 Page 27

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