Troubleshooting - Desa VVF36 Owner's Operation And Installation Manual

WARNING: Turn off heater, disconnect power if applicable and
let cool before servicing. 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: The two most common causes of malfunctioning gas appliances are loose wiring con-
nections and construction debris clogging pilot and/or control valve filter.
Note: Before troubleshooting the system make sure gas shut off valve is open.
MILLIVOLT SYSTEM
ObSERVED PRObLEM
Pilot.will.not.light
Pilot.will.not.stay.lit
No gas to burner, although wall
switch.and.valve.are.set.to.the.
ON.position
Frequent pilot outage
Pilot.goes.out.when.wall.switch.
is.on
56131H

TROUbLESHOOTING

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..Control.valve.knob.is.not.on.
the.PILOT.position
6..Kinked.pilot.line
7..Bad.valve
8..Bad.thermocouple.or.loose.
connection
1..Loose.wiring.on.thermopile.
to. regulator. valve..No. mil-
livolt.current. being.sent. to.
regulator
1..Wall. switch. wires. defec-
tive
..Thermopile. generator. or.
sensor.not.generating.suf-
ficient voltage
1. Pilot flame may be too low,
causing.safety.pilot.to."drop.
out"
1..Millivolt. output. on. thermo-
pile.too.high
www.desatech.com
REMEDY
1..Check. to. see. if. you. have.
gas.supply
..Hold. control. valve. in. the.
PILOT. position. for. . to. 3.
minutes.to.purge.air..If.you.
smell.gas.stop.and.wait.for.
a.few.minutes.before.trying.
to light the fireplace
3. Remove debris and dirt,
inspect.and.clean.any.other.
possible.obstructions
4..Contact.your.gas.supplier
5..Refer. to. section. on. pilot.
lighting
6. Have a qualified technician
replace.pilot.line
7..Replace.control.valve.(see.
Replacement Parts and Ac-
cesssories, page 34)
8..Tighten. thermocouple. or.
replace
1..Check. wiring. connection..
Refer. to. Wiring Diagrams,
page.33
1..Check. electrical. connec-
tions
..Recheck.problem.Pilot Will
Not Stay Lit
1. Clean and adjust pilot flame
for. maximum. flame. im-
pingement.on.thermopile
1..Replace.thermopile
31