Hitachi RAS-18YH4 - Page 85

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Communication error
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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 control P. W.B. if needed.
No
No
No
No
No
Yes
Yes
Yes
Yes Yes