Troubleshooting - Bradford White TW Series Service Manual

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-two flash, three
second pause
Eight-three flash, three
second pause
Eight-four flash, three
second pause
16
Control Status
1. Unstable pilot.
2. Pilot tube blocked or restricted.
Failed to light pilot.
3. Oxidation build up on pilot electrode.
System auto resets.
4. Wire damage to pilot assembly or bad
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.
Simulated
Resistive Device
Simulated resistive device out of specification.
Harness out of
specification.
Simulated
Resistive Device
Harness Simulated resistive device out of specification.
specification
check.
Temperature
1. Damage to temperature sensor.
sensor damaged
2. Temperature 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

Troubleshooting

Service
Procedure
1. Page 15
2-4. Page 17
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. Page 15
2-4. Page 17
5. Refer to installation manual
Replace gas control,
page 26
Page 28
Page 28
Page 24
1. Interrupt power supply
2. Replace gas control,
page 26
1. Interrupt power supply
2. Replace gas control,
page 26
Page 16