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9 Troubleshooting
9.1 Messages (Code type bxx or Exx)
9.1.1. Messages (type code bXX)
In the case of failure, the control panel displays a message and a
corresponding code.
1. Make a note of the code displayed.
The code is important for the correct and rapid diagnosis of the
type of failure and for any technical assistance that may be
needed.
2. Disconnect and reconnect the mains cable.
The appliance will restart only when the malfunction has been
corrected.
3. If the code is displayed again, correct the problem by following the
instructions in the table below:
Code no.
Description Checking / solution
B00
Parameter error on the PCU PCB Reset the parameters
B01
Pressure switch alarm
Note: DHW production is handled by back-
up if back-up enabled
4 Check the power supply to the compressor
4 Check the pressure switch connection
B02
Maximum DHW temperature exceeded
Note: DHW production is not covered (by the
compressor or the back-up)
4 Check the connection on the top DHW sensor
4 Check that the back-up is not running permanently
B03
The room temperature is higher than 35°C.
The compressor is outside its operating
range.
Note: DHW production is handled by back-
up if back-up enabled.
4 Modify the parameters according to the instructions in the
manual.
4 The compressor will handle DHW production once the room
temperature is less than 35°C.
B04
The room temperature is less than -5°C.
Note: DHW production is handled by back-
up if back-up enabled.
4 Modify the parameters according to the instructions in the
manual.
4 The compressor will handle DHW production once the room
temperature is higher than -5°C.
B25
The bottom 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
9. Troubleshooting TWH 200E TWH 300E TWH 300EH
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02/06/2015 - 300026515-001-06
64


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