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Code no. Description Checking / solution
B26
The bottom DHW temperature sensor is
open
Bad connection
4 Check whether the sensor is connected
4 Check the link and the connectors
4 Check that the sensor has been correctly fitted
Sensor fault
4 Check the Ohmic value of the sensor
4 Replace the sensor if necessary
B27
The top DHW temperature sensor is short
circuited
Bad connection
4 Check whether the sensor is connected
4 Check the link and the connectors
4 Check that the sensor has been correctly fitted
Sensor fault
4 Check the Ohmic value of the sensor
4 Replace the sensor if necessary
B28
The top DHW temperature sensor is open
Bad connection
4 Check whether the sensor is connected
4 Check the link and the connectors
4 Check that the sensor has been correctly fitted
Sensor fault
4 Check the Ohmic value of the sensor
4 Replace the sensor if necessary
B32
The impressed current anode is in open
circuit.
4 Check that the connection cable between the SCU PCB and the
anode is not severed
4 Check that the anode is not broken
4 Check that the DHW tank is correctly filled with water
Remarks:
4 Domestic hot water production has stopped but can
nonetheless be restarted using key V (For 72 hours)
4 Protection against corrosion is not ensured
B33
The impressed current anode is short-
circuited.
4 Check that the connection cable between the PCU PCB and the
anode is not short-circuited
4 Check that the anode is not short-circuited
Remarks:
4 Domestic hot water production has stopped but can
nonetheless be restarted using key V (For 72 hours)
4 Protection against corrosion is not ensured
B40
Measurement error on the domestic hot
water temperature sensors.
Remarks:
4 This message is only displayed on initial
commissioning.
4 This message disappears after 10
minutes or when you press the B key.
The 3 sensors do not measure the same value
4 Check the location of the sensors.
Err
BuS
No communication between the control
panel and the PCU board.
4 Check the wiring between the control panel and the PCU board.
InIt
12
No communication between the control
panel and the PCU board.
4 Check the wiring between the control panel and the PCU board.
If the causes of the problem are still present after several attempts at
automatic start-up, the appliance goes into lockdown mode (also
called failure).
TWH 200E TWH 300E TWH 300EH
9. Troubleshooting
02/06/2015 - 300026515-001-06
63
65


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