Deletion Of Sensors From The Memory In The Pcb - DeDietrich AWHP-2 MIT-IN-2 iSystem Installation And Service Manual

8. Troubleshooting
Code Faults
D27 PCU COM. FAIL
D32 5 RESET:ON/OFF
D37 TA-S SHORT-CIR
TA-S DISCONNEC SCU
D38
D99 DEF.BAD PCU
L33 FAIL.FLOW
124
Cause Description
of the
fault
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 5 resets done in less than an hour
Switch off heat pump and start up again
4
SCU The Titan Active System® is short-circuited
Check that the connection cable between the SCU PCB and the anode is not short-
4
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 heat pump, check that the
TAS simulation connector (delivered in package AD212) is fitted to the sensor board.
The Titan Active System® is on an open circuit
Check that the connection cable between the SCU PCB and the anode is not severed
4
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 heat pump, check that the
TAS simulation connector (delivered in package AD212) is fitted to the sensor board.
The SCU software version does not recognise the PCU connected
Update the SCU with the appropriate software version.
4
The flow rate is lower than the threshold defined by the MIN.STOP.FLOW. parameter
Check that the valve is open and the filter is not clogged.
4
Check the speed setting on the circulator pump in the heat pump and the electrical
4
connection.
8.4.1.
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
4 Select YES by turning the rotary button and press to confirm.
Checking / solution
Deletion of sensors from the memory in the
PCB
sensor? is displayed.
The outside temperature sensor cannot be deleted.
AWHP-2 MIT-IN-2 iSystem
25/06/2014 - 7616371-001-04