www.desatech.com
117437-01D
9
TROUBLESHOOTING
Continued
POSSIBLE CAUSE
1. No gas supply, or shutoff
valve.is.OFF
..Air.in.gas.line
3..Construction. debris. clog-
ging pilot orifice
4..Low.gas.pressure
5..Kinked.pilot.line
6..Control.valve.is.not.open-
ing
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
..Pilot. flame. too. low. to.
sense
1. Pilot flame may be too low
to. sense. flame. causing.
ignition. module. to. shut.
down
..Improper. or. restricted.
venting
OBSERVED PROBLEM
Electronic Ignition Models
Only
.Ignitor.will.not.spark.or.
pilot.will.not.light
Electronic Ignition Models
Only
Pilot.will.not.stay.lit
Electronic Ignition Models
Only
Frequent.outage.of.main.
burner.and.pilot.after.complete.
ignition.sequence
REMEDY
1..Check.to.see.if.you.have.gas.
supply.and.that.equipment.
shutoff.valve.is.opened
..Repeat. lighting. procedure.
several.times.to.purge.all.air.
out.of.lines..If.after.repeated.
attempts. appliance. does.
not light, call for qualified
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 qualified technician
replace.pilot.line
6..Replace.control.valve.(Re-
fer.to.
Replacement Parts
,
page.31)
7..Check. that. main. power. is.
on. and. that. wire. connec-
tions. are. made. correctly.
to. the. ignition. model. (see.
Wiring Diagrams
, page 13).
Check. for. 4. VAC. at. the.
secondary.side.of.the.trans-
former. If 24 VAC is present,
and. the. module. does. not.
operate, have the module
replaced. otherwise. have.
the.transformer.replaced
1..Check. wiring. connection..
Refer.to.wiring.diagram.(see.
Wiring Diagrams
, page 13)
and/or.check.ground.wire.to.
ignition.module
..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
1. Clean and adjust pilot flame
for maximum flame across
sensor.rod
..Locate.and.correct.all.vent.
conditions.(see.
Checking for
Proper Venting
, page 10)
