Hi,
Just bought heat pumps from ebay 11.9Kw air to water source. make whraft.
I checked them (standard check) powered it and on the programer it gives me E10 error
code which according to book is communication error, I pushed the contactor to check
if the compressor was ok and it is, now very very confused what is the other step please guide (system is dry at the moment)

Help needed

thanks
kibosho