Error Memory - REMEHA Calenta 25s Installation And Service Manual

8. Troubleshooting
Shutdown Description
code
Configuration fault or PSU
(1)
5v[18
PCB not recognised
Configuration fault or
(1) parameters df-dV
5v[19
unknown
Configuration procedure
(1)
5v[20
active
Communication error with the
5v[21
SU PCB
No flame during operation
5v[22
Internal error on the SU PCB
5v[25
(1) These lock-outs are not stored in the fault memory
8.3

Error memory

90
Probable causes
Wrong PCU PCB for this
4
boiler
Active for a short time
4
after switching on the
boiler
Bad connection
4
No ionization current
4
The boiler control is equipped with an error memory. The last 16 errors
encountered are recorded in this memory.
In addition to the error codes, the following data are also saved:
4 Number of times that the error occured: (MK[xx).
4 Boiler operating mode selected (5t[xx).
4 The flow temperature (t1[xx) and the return temperature
(t2[xx) when the error occured.
To view the error memory, you first have to enter access code
0012.
Calenta 25s - 28c - 35s - 40c
Checking / solution
Replace the PCU PCB
4
Reset df and dV
4
No action required
4
Check whether the PCU PCB has been
4
correctly fitted in the connector on SU PCB
Purge the gas supply to remove air
4
Check that the gas valve is fully opened
4
Check the supply pressure
4
Check the operation and setting of the gas
4
valve unit
Check that the air inlet and flue gas discharge
4
flues are not blocked
Check that there is no recirculation of flue
4
gases
Replace the SU PCB
4
040412 - 7600585-01