Hitachi RAS-E10H2 - Page 83

Communication error
.
LD301 blinks 9 times
.
Is the connecting cable connected properly?
(Is 35V being output on the indoor unit side?)
Is DC35V being output between terminals C and D? Normal: DC32V – 39V
Is DC35V being output at both ends of R35
?
Connect properly.
Replace the main P.W.B.
• Defective SW power supply
Replace the main 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
Yes
Yes
Yes
Yes
LD301 blinks 7 times. Thermistor abnormal.
Is the thermistor connector disconnected?
The problem may be
“forgetting to connect after
servicing
”.
Is the continuity of the thermistor normal?
Is the thermistor circuit normal?
Connect the thermistor
.
Replace the thermistor
.
Replace parts in the thermistor circuit.
Check continuity of pattern and lead wires according to
the P.W.B. and schematic diagrams.
Yes Yes
Ye
s
No
No
No
No
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