74
13 - TROUBLE SHOOTING
Shutdown Code Table
Shut-
down
Code
Description
Probable Causes
Checking/Solution
Su:0
Parameter error
Parameter error on the PSU
PCB
Reset df and dU Restore parameters
Su:1
Maximum supply
temperature exceeded
Non-existent or insufficient
circulation / sensor error
Check the circulation (direction, pump, valves)
Reasons for the heat demand
Su:2
Maximum increase of the
supply temperature has
been exceeded
Non-existent or insufficient
water circulation / sensor
error
Check the circulation (direction, pump,valves)
Check the water pressure
Check sensors are operating correctly
Check sensor has been correctly fitted
Check cleanliness of heat exchanger
Su:7
Max difference between
T. supply/return exceeded
Non-existent or insufficient
circulation / sensor error
Check the circulation (direction, pump,valves)
Check the water pressure
Check the sensors are operating correctly
Check that the sensor has been correctly fitted
Check the cleanliness of the heat exchanger
Su:8
No release signal
External cause Parameter
error Bad connection
Correct the external cause
Check the parameters
Check the wiring
Su:9
Line and neutral of power
supply are mixed up (if
P43=1)
Power supply incorrectly wired
Floating or 2 phase network
Line and neutral mixed up
Set parameter p43 to 0
Su:10
Shutdown input is open
External cause Parameter
error Bad connection
Correct the external cause
Check the parameters
Check the wiring
Su:11
Shutdown input active or
frost protection active
External cause
Parameter error
Bad connection
Correct the external cause
Check the parameters
Check the wiring
Su:13
Communication error with
the SCU PCB
Bad connection with BUS
SCU PCB not installed in boiler
Check the wiring
Carry out automatic detection to find aux. PCB’s
Su:15
Gas pressure too low
Non-existent or insufficient
gas Pressure.
Incorrect setting of the Gps
gas pressure switch on SCU
PCB
Check that the gas valve is fully opened
Check the supply pressure
Check whether the Gps gas pressure control
system has been correctly fitted
Replace the Gps gas pressure control system if need be
Su:16
(1)
Configuration fault or SU
PCB not recognized
Wrong SU PCB for this boiler
Replace the SU PCB
Su:17
(1)
Configuration fault
or default parameter
table incorrect
Parameter dF-dU error on the
PSU PCB
Reset df and dU
Restore parameters
Su:18
(1)
Configuration fault or PSU
PCB not recognized
Wrong PSU PCB for this boiler Replace the PSU PCB
Su:19
(1)
Configuration fault or
parameters “df-du”
unknown
---
Reset df and dU
Restore parameters
P/N 240011654, Rev. C [06/08/2017]