Utica Boilers UB90-200 Installationsanweisungen

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.

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.

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.

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 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.

Flame proven.

Checking for flame signal (during trial for ignition)

Flame unproven.