Hitachi RAF-25NH4 Données Techniques page 251

nspection method 3
Check 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.
Check the operation.
Replace OH
thermistor A.
Replace DEF
thermistor A.
Replace outdoor
temperature
thermistor A.
Replace expansion
valve thermistor A.
Blinks differently from
the replaced thermistor.
Replace the thermistor according
to the number of blinks.
LD301B: On
LD302B: Blinking
LD302B: Blinks once
OH thermistor B
abnormally
LD302B: Blinks twice
DEF thermistor B
abnormally
LD302B: Blinks four times
Expansion valve thermistor
(narrow pipe 1) B abnormally
LD302B: Blinks five times
Expansion valve thermistor
(wide pipe 1) B abnormally
LD302B: Blinks six times
Expansion valve thermistor
(narrow pipe 2) B abnormally
LD302B: Blinks seven times
Expansion valve thermistor
(wide pipe 2) B abnormally
Blinks the same as
the replaced thermistor.
Replace the thermistor connector, and
use a tester to check the resistance.
abnormally
Replace the thermistor
once again.
276
B cycle thermistor abnormally
Replace OH
thermistor B.
Replace DEF
thermistor B.
Replace expansion
valve thermistor B.
Normal
The control P.W.B. may be broken.
Replace the control P.W.B..