Hitachi RAC-09CHV1 User Manual

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2. Outdoor unit is not working (but can receive signal from the remote controller).
Is voltage normal between pins 1 – 4 of the CN6 (Test-pin)?
❈CN6 pin 3 has DC12V. Take care in handling of tester
pin to avoid any short-circuit with other pins when checking.
[]
< NORMAL >
Indoor - Thermistor
Temperature
Voltage between
CN 1 – 4
20°C about 2.5V
25°C about 2.8V
30°C about 3.1V
Ye s
Is voltage normal between pins 1 – 5 of the CN6 (Test-pin)?
< NORMAL >
Heat exchanger
Thermistor Temperature
Voltage between
CN 1 – 5
20°C about 2.5V
25°C about 2.8V
30°C about 3.1V
Check indoor thermistor, if it
is not in order, exchange
thermistor.
< Normal > 20°C[about 12.5k
25°C[about 10k
30°C[about 8k
Is LD301 of outdoor electrical
unit blinking 9 times?
Check heat exchanger
thermistor, if it is not in order,
exchange thermistor.
< Normal > 20°C[about 12.5k
25°C[about 10k
30°C[about 8k
Check outdoor electrical unit
and repair break-down parts
(around transmit circuit of
outdoor inter-face).
Q801 collector has indoor
transmission signal.
Check transmit circuit of
indoor inter-face and repair
break-down parts.
about 4V
0V
▲
38kHz about 2Vp–p
Transmission wave
Is LD301 of outdoor unit electrical
1 time blinking or lighting?
Exchange indoor control
circuit board.
Check outdoor unit according
to frequency of LD301 blinking
and repair the break-down
parts.
Check outdoor electrical unit
and repair break-down parts.
(around receiving circuit of
outdoor inter-face).
No
No
No
Ye s
Ye s
No
No
Ye s
Ye s
Ye s
No

Hitachi RAC-09CHV1 Specifications

General

Brand	Hitachi
Model	RAC-09CHV1
Category	Air Conditioner
Language	English