UTICA BOILERS UB90-200 Installation, Operation & Maintenance Manual page 34

System Status
The indicator lights track the operating sequence. If the system locks out, the lights indicate the point in the sequence of
operation were lockout occurs. If this table does not readily provide the reason for boiler malfunction or non-operation,
refer to the following pages for more detailed troubleshooting procedures.
LIGHT STATUS
ON
POWER OFF
Blinking
ON
PURGE OFF
Blinking
ON
IGNITER
OFF
ON
VALVE OFF
Blinking
On Bright
FLAME On Dim
OFF
TROUBLESHOOTING
IBC is energized through 24 volt transformer.
IBC is not energized.
IBC receives more than 40 VAC.
IBC is energizing the draft inducer and air fl ow is proven.
Off during purge cycle - draft inducer is not powered on or air fl ow is not proven.
Off during igniter and run cycle - normal operation, purge cycle complete.
IBC is locked out. Problem could indicate false positive proof of air fl ow. Blocked vent,
intake air pipe, fl ue way, or orifi ce in negative pressure hose.
IBC is energizing igniter.
Igniter is not energized.
IBC is energizing gas control valve to open.
Gas control valve is closed.
IBC is locked out. Problem is fl ame has not been proven in three (3) ignition attempts.
May be due to broken igniter or lack of/low fl ame signal, or no gas.
Flame proven.
Checking for fl ame signal (during trial for ignition)
Flame unproven.
INDICATES
34