15 | Troubleshooting
Installer reference guide
207
EWAA011~016DA + EWYA009~016DA
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P620242-1 – 2020.06
Error code Description
UA-21 Extension/hydro mismatch problem
UF-00 Reversed piping or bad communication wiring
detection
NOTICE
When the minimum water flow is lower than described in the table below, the unit
will temporarily stop operation and the user interface will display error 7H‑01. After
some time, this error will reset automatically and the unit will resume operation.
If operation is… Then the minimum required flow rate
is…
Cooling 20l/min
Heating/defrost when outdoor
temperature is above –5°C
Heating/defrost when outdoor
temperature is below –5°C
22l/min
INFORMATION
If error 89-05 or 89-06 occurs, check the minimum water volume during cooling.
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
The user interface will display how to reset an error code.
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