Bradford White PDX250T6*FBN Service Manual page 13

PDX Series
LED Status
Six-one flash, three
second pause
Six-two flash, three
second pause
Six-three flash, three
second pause
Six-four flash, three
second pause
Seven flash, three
second pause
Eight-one flash, three
second pause
Eight-three flash, three
second pause
Eight-four flash, three
second pause
Control
Status
1. Unstable pilot.
Failed to light
2. Pilot tube blocked or restricted.
pilot.
3. Oxidation build up on pilot electrode.
System auto
4. Wire damage to pilot assembly or bad
resets.
connection at gas valve.
Pressure switch 1. Vent blockage or improper vent configuration.
or blower temp 2. Pressure switch tubing kinked or blocked.
switch opened 3. Faulty pressure switch.
during burner 4. Vent termination being affected by wind
operation. 5. Blower not spinning up to speed.
System auto 6. Blower temp or exhaust temp too high
resets. 7. Faulty blower temperature switch.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
Pilot flame
3. Oxidation build up on pilot electrode.
extinguished.
4. Wire damage to pilot assembly or bad
System auto
connection at gas valve.
resets.
5. Insufficient combustion air.
6. Gas pressure is out of specification.
Undesired-false
pilot flame
sensed. Pilot valve stuck in open position.
System auto
resets.
* Indicates gasoline vapors were detected at potentially
explosive levels.
Flammable Vapor
* Verify no gasoline vapors are still present
Sensor fault
* Reset the control by cycling power to the appliance or
detected
by cycling the ON/OFF switch.
* Replace the Flammable Vapors Sensor element if a
gasoline spill event occurred.
* Verify Flammable Vapor Sensor (FVS) resistance is
Flammable Vapor
not below 25 K Ohms.
Sensor out of
* Check wiring to FVS and insure it is not shorted.
specification.
* Replace control if everything above checks out OK.
Thermal well
1. Damage to thermal well wire.
sensor damaged
2. Thermal well sensor resistance out of range.
or unplugged
Gas valve
1. Control needs to be reset.
electronics fault
2. Control is wet or physically damaged.
detected
Gas valve fault 1. Control needs to be reset.
detected. 2. Control is wet or physically damaged.
Probable Cause
WARNING: EXPLOSION HAZARD
Troubleshooting
Service
Procedure
1. Page 14
2-4. Page 16
1. Check vent or vent tables.
2 & 3 Page 17
4. Refer to venting section of
installation manual
5. Page 21
6 & 7 Page 23
1. Page 14
2-4. Page 16
5. Refer to installation manual
Replace gas control,
page 27
Page 29
Page 29
Page 25
1. Interrupt power supply
2. Replace gas control,
page 27
1. Interrupt power supply
2. Replace gas control,
page 27
Page 13
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