Deletion Of Sensors From The Memory In The Pcb - DeDietrich MODULENS O AFC 18 Installation And Service Manual

9. Troubleshooting
Code Faults
D19 SOL.COL.S.FAIL
D20 SOL COM.FAIL
D27 PCU COM. FAIL
D37 TA-S SHORT-CIR
D38 TA-S DISCONNEC
D99 DEF.BAD PCU
154
Cause Description
of the
fault
SCU Header sensor fault
SCU
Switch the boiler off and switch back on
4
Check whether the solar module is switched on. If necessary, replace the fuse.
4
¼Refer to the installation, commissioning and service manual for the DHW
tank
Check the connection between the SCU-C and the solar module
4
SCU Communication failure between the SCU and PCU PCBs
Check the wiring between the SCU and PCU PCBs
4
Check that the PCU PCB is powered up (green LED on or flashing)
4
Change the PCU PCB
4
SCU The Titan Active System® is short-circuited
Check that the connection cable between the SCU PCB and the anode is not
4
short-circuited
Check that the anode is not short-circuited
4
Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using
key r.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
SCU The Titan Active System® is on an open circuit
Check that the connection cable between the SCU PCB and the anode is not
4
severed
Check that the anode is not broken
4
Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using
key r.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
SCU The SCU software version does not recognise the PCU connected.
Update the SCU with the appropriate software version
4
9.4.1.
The configuration of the sensors is memorised by the SCU PCB. If a
sensor fault appears whilst the corresponding sensor is not
connected or has been voluntarily removed, please delete the sensor
from the SCU PCB memory.
4 Press key ? repeatedly until Do you want to delete this
sensor? is displayed.
Checking / solution
Bad connection
Check whether the sensor is connected:
4
¼See chapter: "Deletion of sensors from the
memory in the PCB", page 154
Check the link and the connectors
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Deletion of sensors from the memory in the
PCB
AFC 18 - AFC 24 - AFC 30
09/07/2015 - 300026439-07