Code
Description
Checking / solution
The top domestic hot water temperature sensor
has short-circuited
Bad connection
Check whether the sensor is connected.
Check the connection and the connectors.
Check that the sensor has been fitted properly.
Defective sensor
Check the Ohmic value of the sensor.
Replace the sensor if necessary.
The top domestic hot water temperature sensor is
open
Bad connection
Check whether the sensor is connected.
Check the connection and the connectors.
Check that the sensor has been fitted properly.
Defective sensor
Check the Ohmic value of the sensor.
Replace the sensor if necessary.
The impressed current anode is in open circuit.
Check that the connection cable between the
SCU PCB and the anode is not severed
Check that the anode is not broken
Check that the water heater tank is filled with
water
Note
Production of domestic hot water is
stopped for 72 hours but may be re
started by pressing the RESET key
Protection against corrosion is not
guaranteed
The impressed current anode has short-circuited.
Check that the connection cable between the
PCU PCB and the anode has not short-circuited
Check that the anode has not short-circuited
Note
Production of domestic hot water is
stopped for 72 hours but may be re
started by pressing the RESET key
Protection against corrosion is not
guaranteed
Measurement error on the domestic hot water tem
perature sensors
Note
This message is only displayed on
initial commissioning
This message disappears after 10
minutes or when you press the
key
The two sensors do not measure the same value
Check the location of the sensors
No communication between the control panel and
the PCU PCB.
Check the wiring between the control panel and
the PCU PCB.
No communication between the control panel and
the PCU PCB.
Check the wiring between the control panel and
the PCU PCB.
Activation of optimised mode.
The domestic hot water tank is charged by optimal
use of the heat pump and hydraulic back-up.
9 Troubleshooting
300026515 - v09 - 25072017
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