A.O. Smith TC-099 User Manual

Page 7

VF BOILER SERVICE MANUAL

AOS WPC - Tech Training

6 of 72

Servicing should only be performed by a Qualified Service Agent

UIM - USER INTERFACE MODULE - STATUS LIGHTS

LCD display
4 line x 20 character

System Status

Firing Rate

LEDs

5 Touch Sensitive

User Input Buttons

System Status LED Lights

Firing Rate Status

The three “System Status” LED lights on the upper

right portion of the UIM convey current operational

and diagnostic information.
The red Service LED will be continuously illuminated

for soft lock-outs and flashing on and off for hard lock-

outs.

Soft lock-outs will automatically reset after the condition that caused the error has been

corrected or a factory programmed time period of one hour. Soft lock-outs can also be reset

by touching the Select button while the error screen is displayed.
Hard lock-outs can only be reset by touching the Select button while the error screen is

displayed. Power interruptions or cycling the power on and off will not reset hard or

soft lock-outs.
The yellow Standby LED is illuminated whenever the system set point has been satisfied.
The green Running LED is illuminated continuously whenever a call for heat is active.

The Firing Rate Status indicator shows the current

firing rate of the boiler between; 25 and 100%.
The Firing Rate Status indicator will not illuminate

unless flame is proven by one of the two flame

sensors; high fire sensor/low fire sensor.

Status