Daikin Siesta condensor ( loud high frequency inverter noise )

[nick uk]

Hi i have a Daikin siesta ARX35 GV1B 3.5 m pipe run

18 months working no problems other than its always had a very loud high frequency inverter noise from the condensor audible from 8m away

Does anyone have any ideas how to silence it

Thanks Nick

[james10]

they mounting havent come loose have they

[nick uk]

hi James Mountings are ok
noise is electronic from the inverter or compressor could this be linked to the short pipe run
thanks nick

[james10]

how short is the pipe run check the following for full tech info on this unit
http://extranet.daikin.co.uk/login.htm