UTICA BOILERS UB90-125 Installation, Operation & Maintenance Manual page 35

System Status
Indicator lights track operating sequence. If system locks out, lights indicate point in sequence of operation were lockout
occurs. Refer to following pages for detailed troubleshooting procedures.
LIGHT STATUS
POWER OFF
Blinking
PURGE OFF
Blinking
IGNITER
OFF
VALVE OFF
Blinking
On Bright
FLAME On Dim
OFF
13 - SEQUENCE OF OPERATION DIAGNOSTICS
ON
ON
Off during purge cycle - draft inducer is not powered on or air flow 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 flow. Blocked vent,
intake air pipe, flue way, or orifice in negative pressure hose.
ON
ON
IBC is locked out. Problem is flame has not been proven in three (3) ignition attempts.
May be due to broken igniter or lack of/low flame signal, or no gas.
INDICATES
IBC is energized through 24 volt transformer.
IBC is not energized.
IBC receives more than 40 VAC.
IBC is energizing draft inducer and air flow is proven.
IBC is energizing igniter.
Igniter is not energized.
IBC is energizing gas control valve to open.
Gas control valve is closed.
Flame proven.
Checking for flame signal (during trial for ignition)
Flame unproven.
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