Ithe unit is just a few months previous, acquired fifteenth Oct 2018. I have video of your device as well as sounds. An extremely frustrating situation. The Rinnai eight.0kW Inverter Split System provides you with the ultimate Option for just about any heating and cooling desires, all yr spherical! https://nzdepot.co.nz/product/rinnai-8-0kw-pro-series-high-wall-heat-pump-reverse-cycle-systems-hsnrp80/