Bradford White TW4-75S-76B-3N - Manual (Page 44)

44
Troubleshooting continued-
LED Status Control Status Probable Cause
Six flashes‐two
flashes, three second
pause (Soft lockout)
Pressure switch or
blower temperature
switch opened
during burner
operation.
System auto resets
after 5 minutes.
1. Pressure switch tubing kinked or blocked.
2. Vent blockage or improper vent configuration.
3. Vent termination being affected by windy
conditions.
4. Blower not spinning up to speed.
5. Vent temperature too high
6. Faulty pressure switch or blower temp. switch.
Six flashes‐three
flashes, three second
pause (Soft lockout)
Pilot flame
extinguished.
System resets after 5
minutes.
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.
Six flashes‐four
flashes, three second
pause (Soft lockout)
Undesired‐false pilot
flame sensed.
System auto resets.
Pilot valve stuck in open position.
Seven flashes, three
second pause
Flammable vapor
sensor fault
detected, see
warning label
1. Flammable vapor present
2. Flammable vapor sensor exposed to excessive
moisture
3. Flammable vapor sensor exposed to extreme
ambient temp
Eight flashes‐one
flash, three second
pause
Flammable vapor
sensor out of
specification.
Possible short.
1. Flammable vapor sensor out of specification
2. Possible short
Eight flashes, two
flashes, three second
pause
Temperature sensor
fault
1. Damage to sensor or wire in control’s well.
2. Control’s sensor resistance out of range.
3. Replace Control.
Eight flashes‐three
flashes, three second
pause
Electronics fault
detected
1. Verify control is not wet or physically damaged
2. Reset control on/off switch.
3. Replace electronic module if 8‐3 error persists
Eight flashes‐four
flashes, three second
pause
Gas valve fault
detected.
1. Verify control is not wet or physically damaged
2. Reset control on/off switch.
3. Replace gas control if 8‐4 error persists