Crown Boiler AWI037 Installation Instructions Manual page 33

Main
Y
burners
light?
N
24 volts
N
across
B1 &B2 ?
Y
24 volts across
standing pilot gas
valve terminals or
terminals 5&6 on
S8600 module?
N
24 volts
Y
across spill
sw itch?
N
24 volts
across
rollout
sw itch?
Y
N
*Loose electrical
connection in 24
volt w iring
betw een B1 or B2
and gas valve or
module
Do burners
shut dow n before
gage temp
exceeds high limit
setting +15F?
N
*Defective damper
*Defective L8148E
*Defective damper
harness
*Loose damper
harness connection
*Obstruction in path
of damper blade
Refer to standing pilot or
Y
intermittent ignition
troubleshooting chart
(page 32 or 33).
*Chimney blockage
*Chimney system not
constructed in accordance
w ith Parts 7 and 11 of
National Fuel Gas Code.
*Dow n draft
*Inadequate combustion air
supply in boiler room
*Rollout sw itch open.
Replace w ith exact
replacement (see parts
list). Check for blocked
heat exchanger.
33
31
Do burner and
Y
circulator shut
dow n at end of
call for heat?
N
*Defective
L8148A
*Sensing bulb not
bottomed out in
w ell
Pull w ire off of T
terminal on
aquastat. Does
boiler shut dow n?
*T'stat or
zone valve
w iring calling
for heat
*T'stat w ires
shorted
Y
END
N
Y
*Internal boiler
w iring
problem,
consult Crow n
representative