Bradford White TW4-75S-76B-3X - Manual (Page 14)

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
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
Simulated resistive device out of specification. Page 28
Simulated resistive device out of specification. 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
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
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