Hitachi RAS-10JH4 - Checking Outdoor Unit Electrical Parts; OH Thermistor Temperature Rise; Overload Lower Limit Cut; Failure of Switching

Communication error. LD301 blinks 9 times.
Is the connecting cable connected properly? (Is 35V being output on the indoor unit side?)
Are CN3 and CN4 connected?
Is DC35V being output between terminals C and D? Normal: DC32V – 39V Standby: DC18V – 23V
Is DC35V being output at both ends of R35?
Connect CN 3 and CN4.
Connect properly.
Replace the power P.W.B. • Defective SW power supply.
Replace the power P.W.B. • NF coils, IF coils, etc. may be broken.
Check the interface circuit and replace the main P.W.B. if needed.
No
No No
No
No
Yes
Yes
Yes
Yes Yes
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