750-382
CBT
5-13
Troubleshooting
TABLE 5- 1. CBT troubleshooting
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures
Boiler will not start --
no lockout or alarm
present
A. Hold 63 LCI Off A.1. Touch Screen
“Demand” status is in
OFF position
Check demand state
on Falcon boiler Status
screen
Turn Demand switch to
LOCAL
A.2. Auxiliary device
(e.g. OLC) is interrupt-
ing LCI circuit.
Check state of Operat-
ing Limit Control in LCI
circuit.
Check OLC setting -
should be slightly
above Falcon setpoint
+ hysteresis OFF.
A.3. Start interlock
proving switch is not
closed (when using
start interlock)
Check start interlock
device (e.g. air damper
switch) wired in Clear-
Fire's LCI circuit
Correct problem with
start interlock device
and/or wiring connec-
tions (e.g. ensure air
damper is open and
damper prove switch is
functioning properly)
A.4. Jumper is not
wired between start
interlock (typically ter-
minals 13 & 14) termi-
nals in LCI circuit -- no
start interlock con-
nected
Check for jumper
between start interlock
terminals in control
panel -- refer to WD.
Jumper start interlock
terminals if not using a
start interlock.
A.5. Loose wiring in
Falcon LCI circuit (line
18 on wiring diagram)
Check for 115VAC
power along LCI cir-
cuit up to Falcon con-
troller terminal J6-3
Secure wiring to appro-
priate terminal connec-
tion(s)
B. Hold 63 Low Water B.1. Low water condi-
tion -- water level is
low in sight glass
Check that Feed Water
(FW) pump is running
and water is flowing to
boiler
If FW pump is not run-
ning, see Possible
Cause B.2. FW pump
not running; if FW
pump is running, see
Possible Cause B.3.
FW pump is running
Check water level in
the feed tank
If water level is low in
feed tank, check tank
make-up valve/piping
and fix problem
Check water flow to
boiler
Open boiler feedwater
valve(s). Check/adjust
pump pressure relief
valve (if present).
Remove any unneces-
sary restrictions.
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