Without knowing that brand of unit as i don't think they are sold in Australia, I think that the system will have lost its' gas charge. If you remove the small nut cap where the gas pipes enter the outside unit and depress the Schroeder valve, and you have little or no pressure released, then you have a leak on the system.
Answers & Comments
Without knowing that brand of unit as i don't think they are sold in Australia, I think that the system will have lost its' gas charge. If you remove the small nut cap where the gas pipes enter the outside unit and depress the Schroeder valve, and you have little or no pressure released, then you have a leak on the system.