Bradford White D4403S*F(BN Service Manual page 14

Troubleshooting
LED Status
Damper test circuit
Six flashes,
two flashes,
three second
burner operation,
pause (Soft
system auto resets
Lockout)
after (5) minutes
Six flashes,
three
flashes,
three second system auto resets
pause (Soft after (5) minutes
Lockout)
Six flashes,
four flashes,
pilot flame sensed,
three second
system auto resets
pause
Flammable vapor
Seven
flashes, resettable thermal
three second
pause
Eight
Flammable vapor
flashes, one
flash, three
second
pause
Eight
Thermal w ell sensor
flashes,
three
unplugged or gas
flashes,
control electronics
three second
pause
Eight
flashes, four
Gas control fault
flashes,
three second
pause
Page 14
14
Control Status
1. Damper not in proper position
or malfunctioning - damper
not w orking moved from full open position
properly during 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
Pilot flame
electrode
extinguished,
4. Wire damage to pilot
assembly or bad connection at
gas control
5. Insufficient combustion air
6. Insufficient gas pressure
Undesired false
Pilot valve stuck in open position Replace gas control
1. Flammable vapor present
2. Flammable vapor sensor
sensor or exposed to excessive moisture
3. Flammable vapor sensor
sw itch fault exposed to extreme ambient
detected, see temperature
warning label 4. Resettable thermal sw itch
open
1. Flammable vapor sensor out
of specification; verify Flammable
Vapor Sensor (FVS) resistance is
sensor out of
not below 25 k .
specification,
2. Possible short in flammable
possible short
vapor sensor or resettable
thermal sw itch wiring
1. Damage to thermal w ell w ires
2. Thermal well sensor
resistance out of range
damaged or 3. Replace thermal w ell
4. Verify control is not w et or
physically damaged
fault detected 5. Reset control on/off switch
6. Replace gas control if 8-3 error
persists
1. Verify control is not w et or
physically damaged
2. Reset control on/off switch
detected
3. Replace gas control if 8-4 error
persists
Probable Cause Service Procedure
1. See Burner Inspection
on page 15
2-4. See Pilot Inspection,
Testing and Replacement
on pate 17
1. See Burner Inspection
on page 15
2-4. See Pilot Inspection,
Testing and Replacement
on page 17
5. Refer to Installation &
Operation Manual
See Flammable Vapor
Sensor Testing on page 27
See Flammable Vapor
Sensor Testing on page 27
See Thermal Well Testing
on page 21
1. Replace gas control if
w et or physically damaged
2. Cycle power
3. Replace gas control