Utica Boilers UB95M-200 Installationsanweisungen

Control display blank

120 vac at terminals L1 and L2 of line 

voltage strip?

1

NO - Check external line switch and fuse or breaker.

2

Determine if red light on line voltage monitor is flashing 

indication fault.  If there is fault verify input voltage dial 

is properly set in accordance with steps in installation 

manual.  If fault does not clear after ten minutes replace 

line monitor.

120 vac on both sides of fuse F1? 

1

NO - Turn off power to boiler and replace fuse if 

necessary. Inspect boiler interior wiring to determine 

cause of fuse opening.

Wiring correct, in good condition, and 

securely attached?

1

Correct if needed. Replace any damaged wiring or 

components. Replace control module if problem persists.

Display first digit shows 

0; last digits show 2 or 

3-digit number (boiler 

outlet water temp.)

Room thermostat and DHW aquastat 

satisfied?

1

YES - Boiler off, no call for heat. Turn up thermostat or 

aquastat. Boiler should start.

Thermostat or aquastat calling for heat 

but boiler not firing.

1

Check voltage on both sides of low voltage fuse F3. (Turn 

OFF external power before removing cover.) If necessary, 

replace fuse. Determine reason for fuse failure if possible.

2

Check/set boiler parameters 2 and 3. Make sure space 

heat or DHW is turned on. Turn on if necessary.

3

Turn off power to boiler. Temporarily jumper low voltage 

terminal strip terminals T1 and T2 or DHW T1 and 

DHW T2. Retry. If boiler operates, check CH and DHW 

thermostat and wiring. Replace if necessary. Remove 

temporary jumper(s).

4

Turn off power to boiler. Check wiring against wiring 

diagram; verify all wiring in good condition and secure.

5

Replace wire harnesses and retry.

6

Replace control module.

Display first digit shows number from 1 to 8; last digits show 2 or 

3-digit number (boiler outlet water temp.)

1

Boiler in normal operating mode.

Display flashes “9,” then “b.” Last two digits show code number.

1

See User Interface Quick Reference and Soft Lockout

Troubleshooting for more information on soft lockout code.

Display shows U 1.25 

continuously

Transformer unplugged or not 

functional

1

Plug transformer in.

2

Replace transformer.

F3 24V 4 Amp fuse is not functional

1

Replace fuse.