Error
code
Description
Probable causes
Checking / solution
e[38
Communication error
with the SCU PCB
4
Bad connection
4
Defective SCU PCB
4
Check the wiring
4
Replace SCU PCB
e[39
Shutdown input in
locked-out mode
4
Bad connection
4
External cause
4
Parameter incorrectly
set
4
Check the wiring
4
Suppress the external cause
4
Check the parameters
e[40
HRU/URC unit test error
4
Bad connection
4
External cause
4
Parameter incorrectly
set
4
Check the wiring
4
Suppress the external cause
4
Check the parameters
8.2
Shutdowns and lock-outs
8.2.1.
Blockage
If the blocking conditions still exist after several start up attempts, the
boiler will switch into locking mode (fault). The boiler can only start
operating again once the causes of the lock-out have been rectified
and after pressing the
>
key.
8.2.2.
Blocking
A (temporary) blocking mode is a boiler operating function caused by
an unusual situation. In this case, the display gives a code of blocking
(code
5t[9
). The boiler control will try to re-start several times.
The boiler will start up again after the blocking conditions have been
eliminated. The shutdown codes can be read out as follows:
1. Press the two
f
keys simultaneously.
2. Confirm by pressing key
S
.
5t
is displayed, alternating with
the shutdown code
9
.
3. Press the
[+]
key.
5v
appears on the display.
T001632-B
8. Troubleshooting
Calenta 25s - 28c - 35s - 40c
88
040412 - 7600585-01
