Hitachi Summit 2.5kW Failed!

[Jimbo!]

No, the defrost is OK - I mean the outdoor ambient was about freezing. The system was working fine when I left it, but come the morning it would not run, the indoor unit indicating outside unit failure.

It then would not work again, regardless of power cycles etc., for a couple of days. I then left it for the rest of a week, after which it again runs fine!

[Jimbo!]

Hi, in case anyone is interested.

Supplier duly provided crankcase heater which I installed under their direction:
http://sittingbourne.homeserver.com/...ssorHeater.jpg

As it happens it's been really cold past few days, well below freezing on occasion, but system is running perfectly and no lock-outs .

Apparently the lock-out occurs only with thermoplastic tubing, not on copper. Not too sure why.

So final step I'm going to mount a frost-stat in a weatherproof box to control the heater, so it's only on when actually needed.

Thanks again!