Shutdowns And Lock-Outs - UTICA BOILERS UCS-380 Installation, Operation & Maintenance Manual

Error Description
Code
Communication error with
E37
SU PCB
Communication error with
E38
SCU PCB
Shutdown input in locked-
E39
out mode
E40 HRU unit test error
No water temperature
E41 change during deaeration/
air purge
Low water cutoff
E42 disconnected or water
pressure too low
No water temperature
E43 change during boiler
operation (burner on)
Difference between supply/
E44
return temperature too high

13.2 Shutdowns and Lock-outs

Blockage
If a blockage condition continues to exist after several start
up attempts, boiler will switch into lock-out (fault) mode. The
boiler can only start operating again once cause(s) of the lock-
out have been rectified and after pressing
Lock-out Mode
A temporary lock-out caused by an unusual occurrence in the
boiler's operation. e.g. Display gives code of blocked flue
(code St9). Boiler control will try to re-start several times.
Boiler will start up again after blocking condition(s) have been
eliminated.
Shutdown codes can be read out as follows:
• Press the two buttons
• Confirm by pressing
alternating with the shutdown code "9".
• Press the (+) button. "Su" appears on the screen.
Boiler will start again automatically when reason for blocking
has been removed.
13 - TROUBLE SHOOTING
Error Code Table
Probable Causes
Bad connection
Bad connection
Defective SCU PCB
Bad connection
External problem
Parameter incorrectly set
Bad connection External
problem Parameter incorrectly
set
Bad connection
Supply/Return sensor
damaged
No water circulation
Bad connection Water
pressure low
Bad connection
Supply/Return sensor
damaged
No water circulation
Bad connection
Supply/Return sensor
damaged
No water circulation
button.
simultaneously.
button. "St" is displayed,
Checking/Solution
Check whether the SU PCB has been correctly fitted in
connector on PCU PCB
Check the wiring Replace SCU PCB
Check the wiring
Find external problem
Check the parameters
Check the wiring
Find the external problem
Check the parameters
Check the sensor connection
Replace sensor
Check the pump connection
Check the wiring
Refill the system
Check for leaks
Check the sensor connection
Replace the sensor
Check the pump connection
Check sensor connection
Replace sensor
Check pump connection
72
(CHART 8)
(CHART 9)
(CHART 10)
(CHART 11)
P/N 240011662, Rev. D [06/30/2017]