8.3. Diagnosis of error messages
B00 | 128
Power is too low
Cause Solution
a) The power supply is not functioning correctly. 1. Check the domestic electrical installation.
2. Check the cabling and connectors and
correct as necessary.
3. Replace the control board.
B01 | 129
Software error
Cause Solution
a) No communication with watchdog processor. 1. Reset the error.
2. Replace the control board.
B02 | 130
Reset failed
Cause Solution
a) Reset too often while the error is still present. 1. Rectify the error first of all.
2. Disconnect the appliance from the mains
power for twenty seconds.
3. Check the cabling and connectors and
correct as necessary.
4. Replace the control board.
B03 | 131
Safety thermal cut-out
Cause Solution
a) Overheating of hot water temperature sensor. 1. Wait until the water in the heater has
cooled down sufficiently.
2. Run off hot water so that the stored water
cools below the maximum temperature and
the error disappears.
B04 | 132
Time not set
Cause Solution
a) The clock did not activate during initialisation. 1. Set the correct time in the TIME service
menu.
2. Replace the control board.
E00 | 0
Hardware error
Cause Solution
a) EEPROM does not work properly. 1. The appliance automatically resets itself a
maximum of three times.
2. Replace the control board.
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