Specifications

Part number 550-100-090/0809
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
102
Troubleshooting (continued)
Troubleshooting suggestions for Ultra boilersFigure 112
U-Control Fault Displays, Diagnostics and Suggested Corrective Actions
Display
Condition Diagnostics Corrective Action(s)
Nothing shown
on display
screen and
blower running
at full speed
Control is not receiving 24V
power
Check wiring for short circuit or
incorrect wiring.
Correct wiring per wiring diagram including connection of transformer
to the U-Control.
Check 3-amp low voltage fuse
on U-Control shown on page
100.
Replace fuse with proper part found in replacement part section of this
manual. If fuse blows again recheck wiring per diagram.
Check transformer connection
to the U-control per wiring
diagram. Check for 24V output
of transformer.
Replace transformer if it is is receiving 120Vac, but not outputting 24Vac.
U-Control Error Condition Log
The U-control is able to record information about the boiler’s condition at the time of the three previous faults or errors. This
information is available to view in Contractor Menus under “DIAGNOSTICS” by selecting “ERRORS.” The control will display
the following information:
Information Description Action
Control Fault Records the number of internal control faults Select and press the enter key to reset this count
Ignition Retries Displays the number of ignition attempts in the current
ignition sequence.
Manual Reset Count Records number of lockouts that required a manual reset
since this count was last cleared.
Select and press the enter key to reset this count
Auto Reset Count Records number of lockouts that have automatically reset
since this count was last cleared.
Select and press the enter key to reset this count
Lockout History 1 Details of present or last recorded lockout Select and press the enter key for more details
Lockout History 2 Details of boiler during the second oldest lockout still in
memory
Select and press the enter key for more details
Lockout History 3 Details of boiler during the oldest lockout still in memory Select and press the enter key for more details
How to read the last 3 lockout histories:
Scroll down to 1. “DIAGNOSTICS” and press the
enter key (Square Key in center)
Scroll down to 2. “ERRORS” and press the enter key
(Square Key in center)
Scroll down to 3. “LOCKOUT HISTORY #” and press
the enter key.
Scroll to choose the either 4. “MANUAL RESET” or
“AUTO RESET” and press the enter key to display
the fault condition that was recorded.
Press the left arrow key to return to the LOCKOUT 5.
HISTORY # screen. Scroll up or down to highlight
other choices and press the enter key to view the
details of the boiler’s condition when the lockout
was recorded.
TO CLEAR ALL LOCKOUT HISTORIES: While on the 6.
“ERRORS” screen, hold the Left and Right arrow
buttons simultaneously for 5 seconds.