Service Manual

Six-four flash, three
second pause
Undesired-false
pilot flame
sensed.
System auto
resets.
Seven flash, three second
pause
Flammable Vapor
Sensor fault
detected
Eight-one flash, three
second pause
Flammable Vapor
Sensor outof
specification.
Thermal well
sensor damaged
or unplugged
Eight-three flash, three
second pause
Gasvalve
electronicsfault
detected
LED Status Control Status
Service
Procedure
Probable Cause
Pilot valve stuck in open position.
Replace gas control,
page 27 or 29
WARNING:EXPLOSION HAZARD
*Indicatesgasoline vaporswere detected at potentially
explosive levels.
*Verify no gasoline vapors are still present
*Reset the control by cycling power to the appliance or
by cycli
ng theON/OFF switch.
*Replace the Flammable Vapor Sensor element if a
gasoline spill event occurred.
Page 32
*Verify Flammable Vapor Sensor (FVS) resistance is
not below25KOhms.
* Check wiring to FVS and confirm it is not shorted.
*Replace control if everything abovechecks outOK.
Page 32
1. Damagetothermal well wire.
2. Thermal well sensor resistance outof range.
Page 25
1. Control needs to be reset.
2. Control is wet or physicallydamaged.
1. Interrupt power supply
2. Replace gas control,
page 27 or 29
Eight-four flash, three
second pause
Gasvalve fault
detected.
1. Control needs to be reset.
2. Control is wet or physicallydamaged.
1. Interrupt power supply
2. Replace gas control,
page 27 or 29
Troubleshooting
Six-three flash, three
second pause
Pilot flame
extinguished.
System auto
resets.
1. Unstablepilot.
2. Pilot tube blocked or restricted.
3. Oxidation builduponpilot electrode.
4. Wire damagetopilot assembly or bad
connection at gasvalve.
5. Insufficient combustion air.
6. Gas pressure is outo
fspecification.
1-4. Page 18
5. Refer to installation manual
Page 13
Six-two flash, three
second pause
Pressure switch
or blower temp
switch opened
during burner
operation.
System auto
resets.
1. Check vent or vent tables.
2 & 3. Page 19
4. Refer to venting section of
installation manual
5. Page 21
6&7. Page 23
8. Refer to installation
manual.
1.Vent blockageorimproper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Vent termination being affected bywind
5. Blower not spinninguptospeed.
6. Blower temp.
or exhaust temp. too high
7. Faulty blower temperature switch.
8. Insufficient combustion air.
Six-one flash, three
second pause
Failed to light pilot.
System auto resets.
1. Unstablepilot.
2. Pilot tube blocked or restricted.
3. Oxidation builduponpilot electrode.
4. Wire damagetopilot assembly or bad
connection at gasvalve.
1-4. Page 18
UPDX Series
13