Hitachi Yutaki fault codes

5 codes from the Hitachi manual for the Yutaki heat pump. Pick one for what it means, the likely causes and where to start.

Code	What it means
38	Abnormality of picking up circuit for protection (outdoor unit)
53	Inverter fin temperature increase
54	Abnormality of inverter fin temperature
8	Excessively high discharge gas temperature at the top of compressor
EE	Compressor protection