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Troubleshooting – Bradford White TW4-75S-76B-3X User Manual

Page 16

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Six-four flash, three
second pause

Undesired-false
pilot flame
sensed.
System auto
resets.

Seven flash, three second
pause

Simulated
Resistive Device
Harness out of
specification.

Eight-one flash, three
second pause

Simulated
Resistive Device
Harness
specification
check.

Eight-two flash, three
second pause

Temperature
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

Simulated resistive device out of specification.

Page 28

Simulated resistive device out of specification.

Page 28

1. Damage to temperature sensor.
2. Temperature 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

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

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

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.

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

Troubleshooting

Page 16

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