Crown Boiler BWF061 - Manual (Page 46)

45
BWF Troubleshooting Chart (contd.)
Caution: Read page 43 before attempting to use this chart.
Pilot
light?
24 volts
between
terminals 5 and
6 on S8670?
See "Intermittent
Ignition System
Troubleshooting
Chart" on next page
24 volts
between NO
terminal on
vacuum switch
and C on
R8285D?
Minimum
vacuum at
switch called for
in Table 9 on
page 42 ?
* Defective
vacuum switch
* Blockage in venting system
* Vent system not installed in
accordance with installation manual
* Excessive silicone on I.D. of vent
system joints
* Blockage, condensate or leakage in
vacuum switch tubing
* Improperly sealed flue collector
* Damaged or missing fan gasket
* Defective fan
* Wind at horizontal vent terminal in
excess of 40 mph
* Rollout switch
open. Replace
switch with exact
replacement,
Crown Part #
960122. Check for
blocked heat
exchanger
Main
burners
light?
N
Do burner,
circulator and
fan shut down at
end of call for
heat?
END
Y
Does boiler shut
down when t'stat
wire is removed from
terminal R on
R8285?
* T'stat or zone valve
wiring calling for heat
* T'stat wires shorted
* Internal boiler wiring
problem, consult
Crown representative
Y
N
N
Y
Do burners shut
down before gauge
temp exceeds
high limit setting
+15F?
* Defective L4080B
* Sensing bulb not bottomed
out in well
N
Y
N
N
N
Y
Y
Continued
from previous
page
Y
N
Y