Behodar:

 

Re: the heat pump, someone posted on Reddit last year that they succeeded with a CGA claim for potential insect damage, and that was after 6.5 years. The relevant bits:

 

I made the claim under the cga that it was not reasonable to get only that long from a reputable heatpump, and won. During the hearing the installer tried to claim it might have been insect damage, but since they refused to diagnose it they hadn't had the chance to inspect the board and therefore I should be liable. One of those small companies that has no idea on the cga and thinks they are free to make their own rules

 

I any case, I made the argument that the cause of the circuit board failure was not due to any negligence in my part, and if the circuit board is vulnerable to insect damage it's clearly not fit for purpose. It's entirely foreseeable that insects would be attracted to a warm dark space in an outdoor unit, and simple protection methods like potting or properly enclosing live components are available. It's certainly worth going down this path, too many installers get away with this and it's not good enough

 

Source: https://old.reddit.com/r/LegalAdviceNZ/comments/1ljubmb/heat_pump_warranty_question/

 

A month later, if anyone wanted a little closure, the manufacturer has agreed to pay for replacement parts. I'm still on the hook for labour, but that's ~$1150 taken off the bill. I'm happy enough with that.