Richard,

As with LG spare parts the service software is relative cheap to purchase. Here in Oz it is approximatley AU$200. Not bad considering it connects across LG's whole product range from Single Split, ducted, Multi to VRF. Maybe you can enquire through your LG rep. If the Engineer you are refer to attending site is from LG then I am surprised he has no Laptop and the service software. I would be questioning on why not. These systems have a number of thermistors and it takes only one to be out of calibration for the system to go into a saftey control parameter. If I remember correctly the FM25AH has 2 compressors and with one faulty thermistor this may result in the 2nd compressor not operating. Let me know how you get on?