Specifications

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Part number 550-100-090/0809

103

g a s -f i r e d w a t e r b o i l e r — Boiler Manual

MAINTENANCE & SPECIFICATIONS

Troubleshooting (continued)

Display

Condition Diagnostics Corrective Action(s)

Nothing

is shown

in display

screen and no

other boiler

components are

operating

Control is not receiving 120V

power

Check service switch and/or

circuit breaker to boiler turned

is on.

Turn on service switch to power boiler.

Is there 120 Volts at the service

switch?

Troubleshoot and correct the power supply to the service switch.

Is the Ultra's ON/OFF POWER

SWITCH located behind the

control pod turned on?

Turn the Ultra's power switch behind the control pod to ON.

Check for 120 volts at the line

voltage terminal block located

inside the control pod.

Correct wiring inside the control pod using the wiring diagram in this

manual.

Inspect 12-amp fuse as shown

on page 100. Replace if

necessary.

Replace the fuse with proper part found in the replacement part section

of this manual. If fuse blows again recheck wiring per diagram.

Nothing is

shown on

display screen,

but boiler is

operating

Occurs when the

communication is lost from

the U-control to the display.

Check for loose connections

and proper pin alignment/

engagement on the U-Control's

plug P9 and the back of the

display circuit board.

Check for continuity on the wire harness from the display to the

U-control. See repair parts section for proper replacement part.

Cycle power oﬀ and on using

boiler power switch and check

for operation.

Replace with new display module. See repair parts section for proper

replacement part.

TEMP RISE TOO

QUICKLY

Occurs when supply

water temperature in heat

exchanger rises faster than

2ºF per second during the

ﬁrst two minutes the burner

is on.

Automatically resets after 1

minute delay or using manual

reset on display.

Manual reset is necessary after 5

automatic resets have occurred

during the same Priority heat

demand. Reset using manual

reset screen on display

Verify water pipe is installed correctly using primary/secondary

connection to the boiler loop. Refer to Figure 4 page 11 for example of

primary/secondary connection.

Minimum pipe sizes

Ultra 80/105 - minimum 1 inch

Ultra 155/230 - minimum 1.25 inch

Ultra 299/399 - minimum 1.5 inch

Verify proper circulator sizing for boiler size and system requirements

starting on page 9.

Boiler ship with proper size circulators:

Ultra 80/105 - Taco 007

Ultra 155/230/299 - Taco 0014

Ultra 399 - Taco 2400-20

See message displayed TEMPERATURE SENSOR and follow procedure for

loose connections.

SUPPLY 58F >

RETURN

Boiler Out temperature

has exceeded the Boiler In

temperature by more than

58ºF

Automatically resets after 30

second delay or using manual