DE DIETRICH TWH 200E - TWH 300E - TWH 300EH - Manual (Page 25)

6 Troubleshooting
6.1 Messages (Code type bxx or Exx)
6.1.1. 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.
¼See chapter: "Return to the factory settings",
page 21 .
B01 Pressure switch alarm
Note: DHW production is handled by back-up if back-up
enabled
4 Contact the professional who takes care of
maintenance of the appliance.
B02 Maximum DHW temperature exceeded
Note: DHW production is not covered (by the compressor
or the back-up)
4
Contact the professional who takes care of
maintenance of the appliance.
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
4 Contact the professional who takes care of
maintenance of the appliance.
B26 The bottom DHW temperature sensor is open
4 Contact the professional who takes care of
maintenance of the appliance.
B27 The top DHW temperature sensor is short circuited
4 Contact the professional who takes care of
maintenance of the appliance.
B28 The top DHW temperature sensor is open
4
Contact the professional who takes care of
maintenance of the appliance.
TWH 200E TWH 300E TWH 300EH 6. Troubleshooting
03/02/2014 - 7605313-001-02 24