Troubleshooting, Electronic ignition system – Desa (V) CB36(N User Manual

Page 25

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117437-01

TROUBLESHOOTING

Electronic Ignition System

Note: For additional help, visit
DESA’s technical service web site at
www. desatech.com

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

WARNING: Turn off heater and

let cool before servicing. Only a quali-
ﬁ ed service person should service
and repair heater.

CAUTION Never use a wire,

needle, or similar object to
clean pilot. This can damage
pilot unit.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Ignitor will not spark or pilot will not light

Pilot will not stay lit

Frequent outage of main burner and pilot
after complete ignition sequence.

1. No gas supply, or shutoff valve is OFF

2. Air in gas line

3. Construction debris clogging pilot oriﬁ ce

4. Low gas pressure

5. Kinked pilot line

6. Control valve is not opening

7. No power to unit or the ignition module

1. Loose wiring on ignitor wire to ignition

module and/or poor ground to ignition

module

2. Pilot ﬂ ame too low to sense

1. Pilot

ﬂ ame may be too low to sense ﬂ ame

causing ignition module to shut down

2. Improper or restricted venting.

1. Check to see if you have gas supply and

that equipment shutoff valve is opened

2. Repeat lighting procedure several times

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

peated attempts appliance does not light,

call for qualiﬁ ed service and repair.

3. Remove debris and dirt, and inspect and

clean any other possible obstructions

4. Contact your gas supplier to check
pressure
5. Have a qualiﬁ ed technician replace pi-
lot

line

6. Replace control valve (Refer to Replace-

ment Parts, page 26)

7. Check that main power is on and that

wire connections are made correctly to

the ignition model (see Wiring Diagram,

page 20). Check for 24 VAC at the sec-

ondary side of the transformer. If 24

VAC is present, and the module does not

operate, have the module replaced oth-

erwise have the transformer replaced.

1. Check wiring connection. Refer to wir-

ing diagram (see Wiring Diagram, page

9) and/or check ground wire to igni tion

module
2. Clean and adjust pilot burner and check

gas supply and inlet pressure to unit

Note: Have a qualiﬁ ed technician replace
pilot assembly if broken or corroded

1. Clean and adjust pilot ﬂ ame for maximum

ﬂ ame across sensor rod.

2. Locate and correct all vent conditions
(see

Checking for Proper Venting, page 8)

Electronic Ignition System

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 ﬁ lter