CleaverBrooks CBT User Manual

750-382
CBT
5-25
Troubleshooting
Q.3. Low fire (Mini-
mum modulation
speed) too low
Observe if Lockout
occurs at lower firing
rate. Compare Mini-
mum modulation
parameter setting to
Manual commission-
ing recommendation.
Increase Minimum
modulation speed by
100-300 RPM as
needed.
Clear Lockout and try
again
If condition persists,
contact factory
False Flame R. Hold/Lockout 105
Flame out of sequence
R.1. Gas valve stuck
open
Check flame signal on
display and visually
check for flame
through burner sight
port
If flame observed
through sight port,
CLOSE manual gas
shut-off valve! Check
status of Safety Shut-
Off gas valve (SSOV) --
replace gas valve if it
failed to close.
Check gas valve out-
put - control panel ter-
minal 3.
If energized, check/
correct wiring.
R.2. Electrical noise
from ignition cables
and/or transformer
Check routing of flame
signal cable/wiring so
that it is at least 12"
away from high voltage
source.
Reroute flame signal
cable/wiring away from
high voltage igntion
sources.
Clear Lockout and try
again
R.3. Failed UV scanner Check flame signal on
display and visually
check for flame
through burner sight
port
If no flame, clear Lock-
out and observe con-
troller status
If condition persists,
replace UV scanner
If UV scanner replace-
ment does not resolve
Lockout 105, contact
factory.
Steam pressure drops
too much when boiler
is off
S. Demand: Steam
Burner state: Standby
(normal)
S.1. Steam On point is
too low
Check On point setting
on status screen
Set Steam On hystere-
sis parameter to 0
(zero)
Problem Display Message Possible Cause/Symp-
tom
Diagnostic Check Corrective Measures

CleaverBrooks CBT Specifications

General

Brand	CleaverBrooks
Model	CBT
Category	Boiler
Language	English