Bradford White D4403S series, Руководство пользователя

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28
TROUBLESHOOTING
LED Status Control Status Probable Cause
None (LED not on
or f lashing)
Elect rical pow er not
present
Cont rol pow er sw it ch in " OFF" posit ion.
Supply volt age int errupt ed.
One short f lash
every f our
seconds
St and-by mode,
Thermost at is sat isf ied (no
f ault s)
Temperat ure demand is sat isf ied (no call f or
heat )
Alt ernat es bright
and dim
(heart beat )
Thermost at calling f or heat
(no f ault )
Tank t emperat ure below set point of
t hermost at
Short f lash once
every second
Weak pilot signal on last
call f or heat
1. Unst able pilot
2. Pilot t ube blocked 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
Tw o f lashes,
t hree second
pause
Damper t est circuit not
w orking
1. Damper not in proper posit ion or
malf unct ioning - st uck in open posit ion
2. Obst ruct ed vent ing
3. Fault y damper
Three f lashes,
t hree second
pause
Damper t est circuit not
w orking
1. Damper not in proper posit ion or
malf unct ioning - not reaching f ull open
posit ion
2. Obst ruct ed vent ing
3. Fault y damper
Four f lashes,
t hree second
pause
Excessive t ank
t emperat ure, syst em must
be reset
1. Thermal w ell sensor out of calibrat ion
2. Fault y gas valve
Five f lashes,
t hree second
pause
False pilot f lame present Pilot valve st uck in open posit ion
Six f lashes, one
f lash, t hree
second pause
(Sof t Lockout )
Failed t o light pilot ,
syst em 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