Hitachi UTOPIA R32 Series Installation And Operation Manual page 70

Code Category
18
Indoor Fan
Motor
19
1A
1b
Indoor Fan
1C
Controller
1d
1E
21
22
23
thermistor on top of compressor
Sensor on
Outdoor Unit
24
25
29
30
31
35 System
36
Abnormality of picking up circuit
38
PMEN0654 rev.0 - 12/2023
Content of Abnormality
Abnormality of indoor fan
system
Activation of protection device
for indoor fan
Abnormality of fan controller fin
temperature
Activation of overcurrent
protection
Problem with current sensor
Activation fan controller
protection
Abnormality of indoor fan
controller voltage
Abnormality of high pressure
sensor
Abnormality of outdoor air
thermistor
Abnormality of discharge gas
Abnormality of heat exchanger
liquid pipe thermistor
Abnormality of heat exchanger
gas pipe thermistor
Abnormality of low pressure
sensor
Incorrect DSW settings of
outdoor unit for CH-Box
Incorrect capacity setting of
outdoor unit and indoor unit
Incorrect setting of indoor unit
number
Incorrect of indoor unit
combination
for protection in outdoor unit
Leading Cause
Abnormality of indoor fan motor (step-out), indoor fan
controller failure
Fan motor overheat, lockup
Abnormality of fin thermistor or fan controller, heat
exchanger clogging, abnormality of fan motor
Abnormality of fan motor
Abnormality of fan controller current sensor
Driver IC error signal detection, instantaneous
overcurrent
Indoor voltage decrease, insufficient capacity of power
supply wiring
Incorrect wiring, disconnecting wiring, breaking wire,
short circuit
Connection of CH-Box to heat pump system,
disconnection of CH-Box to heat recover system
Incorrect capacity setting of outdoor unit and indoor unit,
excessive or insufficient indoor unit total capacity code
Duplication of indoor unit number in same refrigerant
cycle number
Indoor unit is designed for R22
Failure of protection detecting device (incorrect wiring of
outdoor PCB)
14
61