Bradford White URG2PV75H N Series Service Manual page 14

UPV75 Series
LED Status Control Status
Six-one flash,
Failed to light pilot.
three second
System auto resets.
pause
Pressure switch or
blower temp switch
Six-two flash,
three second opened during
pause
burner operation.
System auto resets.
Pilot flame
Six-three
flash, three extinguished.
second pause
System auto resets.
Undesired-false
Six-four flash,
three second pilot flame sensed.
pause
System auto resets.
Seven flash, Simulated resistive
three second device fault
pause detected.
Eight-one Simulated resistive
flash, three device out of
second pause specification.
Eight-two
Temperature
flash, three
Sensor fault.
second pause
Eight-three Gas valve
flash, three electronics fault
second pause detected.
Eight-four
Gas valve fault
flash, three
detected.
second pause
14
14
Probable Cause
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 the gas valve.
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.
1. Unstable pilot.
2. Pilot tube blocked or restricted.
3. Oxidation builds 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.
Pilot valve stuck in open position.
Simulative resistance device out of specification.
Simulative resistive device out of specification.
1. Damage to temperature sensor wire.
2. Temperature sensor resistance out of range.
1. Control needs to be reset.
2. Control is wet or physically damaged.
1. Control needs to be reset.
2. Control is wet or physically damaged.
Troubleshooting
Service
Procedure
Page 18
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
1-4. Page 18
5. Refer to installation
manual
6. Page 25
Replace gas control,
page 27
Page 28
Page 28
Replace gas control,
page 27
1. Interrupt power
supply
2. Replace gas control,
page 27
1. Interrupt power
supply
2. Replace gas control,
page 27