A.O. Smith BTX-100 Service Handbook page 31

ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
UIM (CONT)
Table 4 - Status Icons
STATUS ICON DESCRIPTION
The temperature of the water in the tank has fallen and the water heater will now initialize
a new heating cycle.
The temperature of the water in the tank has reached the Operating Set Point.
The control is unable to initiate any further heating cycles. This is usually caused by a
fault condition detected by the control.
The blower is being energized.
The Blower Prover Air Pressure Switch contacts have closed. Check Mark Icon is visual
confirmation of contact closure.
The igniter has been energized.
The igniter has been energized and the control system has sensed minimum (2.0 AC
amps).Check Mark Icon is visual confirmation of minimum igniter current.
The gas valve has been energized.
The control system has sensed minimum (1.0 µA) DC micro amps.Flame Icon is visual
confirmation of minimum flame sensing current.
The control has detected a fault condition.
The control has detected a warning condition. These conditions will not cause the control
system to lock out (discontinue water heater operation), but does merit attention.
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Servicing should only be performed by a Qualified Service Agent