Hitachi RAF-25NH5 Instructions De Service page 304

nspection method 3
heck the on status of LD301 and the blinking of LD302.
LD301A:On
A cycle thermistor abnormally.
LD302A: Blinking
LD302A: Blinks once
OH thermistor A
abnormally
LD302A: Blinks twice
DEF thermistor A
abnormally
LD302A: Blinks three times
Outdoor temperature
thermistor A abnormally
LD302A: Blinks four times
Expansion valve thermistor
(narrow pipe 1) A abnormally
LD302A: Blinks five times
Expansion valve thermistor
(wide pipe 1) A abnormally
LD302A: Blinks six times
Expansion valve thermistor
(narrow pipe 2) A abnormally
LD302A: Blinks seven times
Expansion valve thermistor
(wide pipe 2) A abnormally
Replace the thermistor, and connect the power source. Then check to see that LD302 is not blinking.
Not blinking
Repair work has finished. Replace the thermistor according
heck the operation. to the number of blinks.
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LD301B: On
LD302B: Blinking
LD302B: Blinks once
Replace OH
OH thermistor B
thermistor A.
abnormally
LD302B: Blinks twice
Replace DEF
DEF thermistor B
thermistor A.
abnormally
Replace outdoor
temperature
thermistor A.
LD302B: Blinks four times
Expansion valve thermistor
(narrow pipe 1) B abnormally
LD302B: Blinks five times
Expansion valve thermistor
(wide pipe 1) B abnormally
Replace expansion
LD302B: Blinks six times
valve thermistor A.
Expansion valve thermistor
(narrow pipe 2) B abnormally
LD302B: Blinks seven times
Expansion valve thermistor
(wide pipe 2) B abnormally
Blinks differently from
the replaced thermistor.
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B cycle thermistor abnormally
Blinks the same as
the replaced thermistor.
Replace the thermistor connector, and
use a tester to check the resistance.
abnormally
Replace the thermistor The control P.W.B. may be broken.
once again. Replace the control P.W.B.
Replace OH
thermistor B.
Replace DEF
thermistor B.
Replace expansion
valve thermistor B.
Normal