Crown Boiler CWD138 - Manual (Page 65)

63 63
Pilot
light?
24 volts
between 24V
and
24V (GND) on
ign. module?
See "Intermittent
Ignition System
Troubleshooting
Chart" on page 64.
Minimum
pressure at
switch called in
Table 7 present
across 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
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 system
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 L4080D
* Sensing bulb not bottomed
out in well
N
Y
N
Y
N
Y
*Tubes reversed on
pressure switch
*Leak in tubes at pressure
switch connection
*Loose pressure switch
harness connection
Y
N
TROUBLESHOOTING CHART FOR BOILERS WITH R8285 CONTROL SYSTEM - PAGE 2 OF 2