Bradford White D4403S series Manual page 29

Troubleshooting continued-
LED Status Control Status
Damper test circuit not
Six flashes, tw o
w orking properly during
flashes, three
burner operation, system
second pause
auto resets after (5)
(Soft Lockout)
minutes
Six flashes, three
Pilot flame extinguished,
flashes, three
system auto resets after
second pause
(5) minutes
(Soft Lockout)
Six flashes, four Undesired false pilot flame
flashes, three sensed, system auto
second pause resets
Flammable vapor sensor or
Seven flashes,
resettable thermal sw itch
three second
fault detected, see
pause
w arning label
Eight flashes, one Flammable vapor sensor
flash, three out of specification,
second pause possible short
Eight flashes, Thermal w ell sensor
three flashes, damaged or unplugged or
three second gas valve electronics fault
pause detected
Eight flashes, four
flashes, three Gas valve fault detected
second pause
Fault
Resettable Thermal Switch Tripped (Open)
Probable Cause
1. Damper not in proper position or
malfunctioning - damper moved from full
open position during run cycle
2. Obstructed venting
3. Faulty damper
4. Damper jostled during run cycle
1. Unstable pilot
2. Pilot tube block 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
Pilot valve stuck in open position
1. Flammable vapor present
2. Flammable vapor sensor exposed to
excessive moisture
3. Flammable vapor sensor exposed to
extreme ambient temperature
4. Resettable thermal sw itch open
1. Flammable vapor sensor out of
specification
2. Possible short in flammable vapor sensor
or resettable thermal sw itch w iring
1. Damage to thermal w ell w ires
2. Thermal w ell sensor resistance out of
range
3. Replace thermal w ell
4. Verify control is not w et or physically
damaged
5. Reset control on/off sw itch
6. Replace electronic module if 8-3 error
persists
1. Verify control is not w et or physically
damaged
2. Reset control on/off sw itch
3. Replace gas control if 8-4 error persists
Probable Cause
1. Insufficient combustion air
2. Flammable vapor present
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