Crown Boiler CWI069 - Manual (Page 39)

39
38
Main
burners
light?
24 volts
across
B1 &B2?
Ref er to standing pilot or
intermittent ignition
troubleshooting chart
(page 41 or 42).
*Def ective damper
*Def ective L8148E
*Def ective damper
harness
*Loose damper
harness connection
*Obstruction in path
of damper blade
24 volts across
standing pilot gas
valve terminals or
terminals 5&6 on
S8600 module?
24 volts
across spill
sw itch?
*Chimney blockage
*Chimney system not
constructed in accordance
w ith Parts 7 and 10 of
National Fuel Gas Code.
*Dow n draf t
*Inadequate combustion air
supply in boiler room
Y
N
N
Y
Y
24 volts
across
rollout
sw itch?
*Loose electrical
connection in 24
volt w iring
betw een B1 or B2
and gas valve or
module
*Rollout sw itch open.
Replace w ith exact
replacement (see parts
list). Check f or blocked
heat exchanger.
Y
N
N
Y
N
Do burner and
circulator shut
dow n at end of
call f or heat?
END
Pull w ire off of T
terminal on
aquastat. Does
boiler shut dow n?
*T'stat or
zone valve
w iring calling
f or heat
*T'stat w ires
shorted
*Internal boiler
w iring
problem,
consult Crow n
representative
Do burners
shut dow n bef ore
gage temp
exceeds high limit
setting +15F?
*Def ective
L8148A
*Sensing bulb not
bottomed out in
w ell
N
Y Y
N
N
Y