14 | Troubleshooting
Installer reference guide
106
EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680077-1 – 2021.11
INFORMATION
If an U8‑04 error occurs, the error can be reset after a successful update of the
software. If the software is not successfully updated then you must make sure that
your USB device has the FAT32 format.
INFORMATION
If the booster heater overheats and is disabled by the thermostatic safety, the unit
will not give an error directly. Check if the booster heater is still in operation if you
experience one or more of the following errors:
▪ Powerful operation takes a very long time to heat up and the error code AJ-03 is
displayed.
▪ During anti-legionella operation (weekly), the error code AH-00 is displayed
because the unit cannot reach the requested temperature required for tank
disinfection.
INFORMATION
A malfunctioning booster heater will have an impact on energy metering and power
consumption control.
INFORMATION
The user interface will display how to reset an error code.
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