Bradford White PDX-75S-70FB-3X - Manual (Page 14)

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 out of
specification.
Thermal well
sensor damaged
or unplugged
Eight-three flash, three
second pause
Gas valve
electronics fault
detected
LED Status Control Status
Service
Procedure
Probable Cause
Pilot valve stuck in open position.
Replace gas control,
page 26
WARNING: EXPLOSION HAZARD
* Indicates gasoline vapors were detected at potentially
explosive levels.
* Verify no gasoline vapors are still present
* Reset the control by cycling power to the appliance or
by cycling the ON/OFF switch.
* Replace the Flammable Vapors Sensor element if a
gasoline spill event occurred.
Page 28
* Verify Flammable Vapor Sensor (FVS) resistance is
not below 25 K Ohms.
* Check wiring to FVS and insure it is not shorted.
* Replace control if everything above checks out OK.
Page 28
1. Damage to thermal well wire.
2. Thermal well sensor resistance out of range.
Page 24
1. Control needs to be reset.
2. Control is wet or physically damaged.
1. Interrupt power supply
2. Replace gas control,
page 26
Eight-four flash, three
second pause Gas valve fault
detected. 1. Control needs to be reset.
2. Control is wet or physically damaged.
1. Interrupt power supply
2. Replace gas control,
page 26
Troubleshooting
Six-three flash, three
second pause
Pilot flame
extinguished.
System auto
resets.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
5. Insufficient combustion air.
6. Gas pressure is out of specification.
1. Page 15
2-4. Page 17
5. Refer to installation manual
Page 14
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 18
4. Refer to venting section of
installation manual
5. Page 20
6 & 7 Page 22
8. Refer to installation
manual.
1. Vent blockage or improper vent configuration.
2. Pressure switch tubing kinked or blocked.
3. Faulty pressure switch.
4. Vent termination being affected by wind
5. Blower not spinning up to speed.
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. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation build up on pilot electrode.
4. Wire damage to pilot assembly or bad
connection at gas valve.
1. Page 15
2-4. Page 17
PDX Series
14 14