Bradford White D4403S series, Manual

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29
Troubleshooting continued-
LED Status Control Status Probable Cause
Six f lashes, t w o
f lashes, t hree
second pause
(Sof t Lockout )
Damper t est circuit not
w orking properly during
burner operat ion, syst em
aut o reset s af t er (5)
minut es
1. Damper not in proper posit ion or
malf unct ioning - damper moved f rom f ull
open posit ion during run cycle
2. Obst ruct ed vent ing
3. Fault y damper
4. Damper jost led during run cycle
Six f lashes, t hree
f lashes, t hree
second pause
(Sof t Lockout )
Pilot f lame ext inguished,
syst em aut o reset s af t er
(5) minut es
1. Unst able pilot
2. Pilot t ube block or rest rict ed
3. Oxidat ion build-up on pilot elect rode
4. Wire damage t o pilot assembly or bad
connect ion at gas valve
5. Insuf f icient combust ion air
Six f lashes, f our
f lashes, t hree
second pause
Undesired f alse pilot f lame
sensed, syst em aut o
reset s
Pilot valve st uck in open posit ion
Seven f lashes,
t hree second
pause
Flammable vapor sensor or
reset t able t hermal sw it ch
f ault det ect ed, see
w arning label
1. Flammable vapor present
2. Flammable vapor sensor exposed t o
excessive moist ure
3. Flammable vapor sensor exposed t o
ext reme ambient t emperat ure
4. Reset t able t hermal sw it ch open
Eight f lashes, one
f lash, t hree
second pause
Flammable vapor sensor
out of specif icat ion,
possible short
1. Flammable vapor sensor out of
specif icat ion
2. Possible short in f lammable vapor sensor
or reset t able t hermal sw it ch w iring
Eight f lashes,
t hree f lashes,
t hree second
pause
Thermal w ell sensor
damaged or unplugged or
gas valve elect ronics f ault
det ect ed
1. Damage t o t hermal w ell w ires
2. Thermal w ell sensor resist ance out of
range
3. Replace t hermal w ell
4. Verif y cont rol is not w et or physically
damaged
5. Reset cont rol on/of f sw it ch
6. Replace elect ronic module if 8-3 error
persist s
Eight f lashes, f our
f lashes, t hree
second pause Gas valve f ault det ect ed
1. Verif y cont rol is not w et or physically
damaged
2. Reset cont rol on/of f sw it ch
3. Replace gas cont rol if 8-4 error persist s
Fault Probable Cause
Resettable Thermal Switch Tripped (Open) 1. Insufficient combustion air
2. Flammable vapor present