Bradford White UPDX2-75T6FRN - Manual (Page 15)

Page 16
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.
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 31
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 Vapor Sensor element if a
gasoline spill event occurred.
Page 32
* Verify Flammable Vapor Sensor (FVS) resistance is
not below 25 K Ohms.
* Check wiring to FVS and confirm it is not shorted.
* Replace control if everything above checks out OK.
Page 32
1. Control needs to be reset.
2. Control is wet or physically damaged. 1. Interrupt power supply
2. Replace gas control,
page 31
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 31
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.
1-4. Page 18
5. Refer to installation manual
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 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.
1-4. Page 18
Troubleshooting
UPDX Series
Eight-two flash, three
second pause
Temperature
sensor damaged
or unplugged
1. Damage to Temperature Sensor.
2. Thermal well sensor resistance out of range. 1 & 2. Replace gas control,
page 31
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