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39
38
Main
burners
light?
24 volts
across
B1 &B2 ?
Refer to standing pilot or
intermittent ignition
troubleshooting chart
(page 41 or 42).
*Defective damper
*Defective L8148E
*Defective 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
switch?
*Chimney blockage
*Chimney system not
constructed in accordance
w ith Parts 7 and 10 of
National Fuel Gas Code.
*Dow n draft
*Inadequate combustion air
supply in boiler room
Y
N
N
Y
Y
24 volts
across
rollout
switch?
*Loose electrical
connection in 24
volt wiring
between B1 or B2
and gas valve or
module
*Rollout sw itch open.
Replace w ith exact
replacement (see parts
list). Check for blocked
heat exchanger.
Y
N
N
Y
N
Do burner and
circulator shut
dow n at end of
call for heat?
END
Pull w ire of f 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
*Internal boiler
wiring
problem,
consult Crow n
representative
Do burners
shut down before
gage temp
exceeds high limit
setting +15F?
*Def ectiv e
L8148A
*Sensing bulb not
bottomed out in
well
N
Y
Y
N
N
Y