The boiler starts up again automatically when the reason
for the blocking has been removed.
Shutdown
code
Description
Probable causes
Checking / solution
5v[0
Parameter error
4
Parameter error on the
PSU PCB
4
Reset
df
and
dV
4
Restore parameters with Recom
5v[1
Maximum flow temperature
exceeded
4
Non-existent or
insufficient circulation
4
Check the circulation (direction, pump,
valves)
4
Reasons for the heat demand
5v[2
Maximum increase of the
flow temperature has been
exceeded
4
Non-existent or
insufficient circulation
4
Sensor error
4
Check the circulation (direction, pump,
valves)
4
Check the water pressure
4
Check that the sensors are operating
correctly
4
Check that the sensor has been correctly
fitted
4
Check the cleanliness of the heat exchanger
5v[7
Maximum difference
between the flow and return
temperature exceeded
4
Non-existent or
insufficient circulation
4
Sensor error
4
Check the circulation (direction, pump,
valves)
4
Check the water pressure
4
Check that the sensors are operating
correctly
4
Check that the sensor has been correctly
fitted
4
Check the cleanliness of the heat exchanger
5v[8
No release signal
4
External cause
4
Parameter error
4
Bad connection
4
Suppress the external cause
4
Check the parameters
4
Check the wiring
5v[9
Phase and neutral of mains
supply mixed up
4
Mains supply incorrectly
wired
4
Floating or 2 phase
network
4
Invert phase and neutral
4
Set parameter
p43
to
0
5v[10
Shutdown input is open
4
External cause
4
Parameter error
4
Bad connection
4
Suppress the external cause
4
Check the parameters
4
Check the wiring
5v[11
Shutdown input active or frost
protection active
4
External cause
4
Parameter error
4
Bad connection
4
Suppress the external cause
4
Check the parameters
4
Check the wiring
5v[13
Communication error with the
SCU PCB
4
Bad connection with BUS
4
SCU PCB not installed in
the boiler
4
Check the wiring
4
Carry out automatic detection
5v[14
Water pressure too low
4
Water pressure too low
4
Check the water pressure
4
Fill the boiler and the installation with water
5v[15
Gas pressure too low
4
Non-existent or
insufficient circulation
4
Incorrect setting of the
Gps gas pressure switch
on the SCU PCB
4
Check that the gas valve is fully opened
4
Check the supply pressure
4
Check whether the Gps gas pressure control
system has been correctly fitted
4
Replace the Gps gas pressure control
system if need be
5v[16
(1)
Configuration fault or SU
PCB not recognised
4
Wrong SU PCB for this
boiler
4
Replace the SU PCB
5v[17
(1)
Configuration fault or default
parameter table incorrect
4
Parameter error on the
PCU PCB
4
Replace the PCU PCB
(1) These lock-outs are not stored in the fault memory
Calenta 25s - 28c - 35s - 40c
8. Troubleshooting
040412 - 7600585-01
89
