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Troubleshooting
LED Status
Control Status
Pressure switch or
Six flashes, two
blower temp switch
flashes, three
opened during
second pause
burner operation,
(Soft Lockout)
system auto resets
after (5) minutes
Six flashes, three
Pilot flame
flashes, three
extinguished,
second pause
system auto resets
(Soft Lockout)
after (5) minutes
Six flashes, four
Undesired false
flashes, three
pilot flame sensed,
second pause
system auto resets
Flammable vapor
Seven flashes,
resettable thermal
three second
switch fault
pause
detected, see
warning label
Flammable vapor
Eight flashes,
sensor out of
one flash, three
specification,
second pause
possible short
Eight flashes,
Temperature
two flashes,
sensor fault
three second
pause
Eight flashes,
Gas control
three flashes,
electronics fault
three second
pause
Eight flashes,
four flashes,
Gas control fault
three second
pause
Page 14
14
1. Vent blockage or improper vent
configuration
2. Pressure switch tubing kinked or
blocked
3. Faulty pressure switch
4. Blow er not spinning up to speed
5. Damper (inside blow er) not fully
opening
6. Faulty blower temperature switch
1. Unstable pilot
2. Pilot tube block or restricted
3. Oxidation build-up on pilot
electrode
4. Wire damage to pilot assembly or
bad connection at gas control
5. Insufficient combustion air
6. Insufficient gas pressure
Pilot valve stuck in open position
1. Flammable vapor present
sensor or
2. Flammable vapor sensor exposed
to excessive moisture
3. Flammable vapor sensor exposed
to extreme ambient temperature
4. Resettable thermal sw itch open
1. Flammable vapor sensor out of
specification; verify Flammable Vapor
Sensor (FVS) resistance is not below
25,000 Ohms.
2. Possible short in flammable vapor
sensor or resettable thermal switch
wiring
1. Damage to temperature sensor
wires
2. Temperature sensor resistance
detected
out of range
3. Replace temperature sensor
1. Verify control is not wet or
physically damaged
2. Reset control on/off switch
detected
3. Replace gas control if 8-3 error
persists
1. Verify control is not wet or
physically damaged
2. Reset control on/off switch
detected
3. Replace gas control if 8-4 error
persists
Probable Cause
Service Procedure
1. See Burner Inspection on
page 15
2-4. See Pressure Switch Testing
and Replacement on page 32
1. See Burner Inspection on
page 15
2-4. See Pilot Inspection, Testing
and Replacement on page 17
5. Refer to Installation &
Operation Manual
Replace gas control
See Flammable Vapor Sensor
Testing on page 24
See Flammable Vapor Sensor
Testing on page 24
See Temperature Sensor Testing
on page 21
See Gas Control Removal on
page 22
1. Replace gas control if wet or
physically damaged
2. Cycle power
3. Replace gas control
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