Alarm Code - Hitachi RAM-20MQ Installation & Maintenance Manual

Alarm Code

Code Category
01 Indoor Unit Activation of protection device (Float switch)
Activation of protection device
02 Outdoor Unit
(High pressure cut)
Abnormality between indoor and outdoor
03
units
Abnormality between inverter PCB and
Transmission
04
outdoor PCB
Abnormality between fan controller and
04.
outdoor PCB
05 Supply Phase Abnormal power source phases
06 Abnormal inverter voltage
Voltage
06. Abnormal fan controller voltage
07 Decrease in discharge gas superheat
Cycle
08 Increase in discharge gas temperature
0A Transmission Abnormality between outdoor units
0b Incorrect outdoor unit address setting
Outdoor Unit
0C Incorrect outdoor main unit setting
11 Abnormal inlet air thermistor
12 Abnormal outlet air thermistor
Indoor Unit
Sensor
13 Abnormal freeze protection thermistor
14 Abnormal gas piping thermistor
19 Fan Motor Activation of protection device for indoor fan
21 Abnormal high pressure sensor
22 Abnormal outdoor air thermistor
Abnormal discharge gas thermistor on top of
23
compressor
Sensor on
Outdoor Unit Abnormal heat exchanger liquid pipe
24
thermistor
25 Abnormal heat exchanger gas pipe thermistor
29 Abnormal low pressure sensor
Incorrect capacity setting of outdoor and
31
indoor units
Incorrect setting of indoor unit no.
35
System
36 Incorrect indoor unit combination
Abnormality of protective circuit in outdoor
38
unit
Abnormality of running current at constant
39 Compressor
speed compressor
3A Abnormality of outdoor unit capacity
Incorrect setting of outdoor unit models
3b
Outdoor Unit
combination or voltage
Abnormal transmission between main and
3d
sub unit(s)
Activation of pressure ratio decrease
43
protection device
Activation of low pressure increase protection
44
device
Activation of high pressure increase
45 Protection
protection device
Device
Activation of low pressure decrease
47 protection device (vacuum operation
protection)
Activation of inverter overcurrent protection
48
device
51 Abnormality of inverter current sensor
53 Power module protection activation
Inverter
54 Abnormality of inverter fin temperature
55 Inverter failure
Activation of outdoor unit fan controller
57 Outdoor Unit
protection
5A Abnormality of fan controller fin temperature
Fan
5b Activation of overcurrent protection
Controller
5C Abnormality of fan controller sensor
Content of Abnormality
.
Activation of float switch (High water level in drain pan, abnormality of drain
pipe, float switch or drain pan)
Activation of PSH (Pipe clogging, excessive refrigerant, inert gas mixing)
Incorrect wiring, loose terminals, disconnected wire, blowout of fuse, outdoor
unit power off
Inverter PCB - outdoor PCB transmission failure
(Loose connector, broken wire, blowout of fuse)
Fan controller - outdoor PCB transmission failure
(Loose connector, broken wire, blowout of fuse)
Incorrect power source, connected to reversed phase, open-phase
Outdoor voltage drop, insufficient power capacity
Excessive refrigerant charge, failure of thermistor, incorrect wiring, incorrect
piping connection, expansion valve locked in open position (loose connector)
Insufficient refrigerant charge, pipe clogging, failure of thermistor, incorrect
wiring, incorrect piping connection, expansion valve locked in closed position
(loose connector)
Incorrect wiring, broken wire, loose terminals
Duplication of address setting for outdoor units (slave units) in the same
refrigerant cycle
Two (or more) outdoor units set as "master unit" exist in the same refrigerant
cycle.
Incorrect wiring, disconnected wire, broken wire, short circuit
Fan motor overheat, locked
Incorrect wiring, disconnected wire, broken wire, short circuit
Incorrect capacity setting of combination, excessive or insufficient indoor unit
total capacity.
Duplication of indoor unit No. in the same refrigerant cycle
Indoor unit designed for R22(old models)
Failure of protection detecting device
(incorrect wiring of outdoor PCB)
Overcurrent, blowout of fuse, current sensor failure, instantaneous power
failure, voltage drop, abnormal power supply
Outdoor unit capacity > 54hp
Incorrect setting of master and slave unit(s) combination or voltage
Incorrect wiring, disconnected wire, broken wire, PCB failure
Bad compression (compressor
Overload at cooling, expansion valve locked (loose connector)
Overload operation (clogging, short-pass), pipe clogging, excessive
refrigerant, inert gas mixing
Insufficient refrigerant, refrigerant piping clogging, expansion valve locked in
closed position (loose connector)
Overload operation, compressor failure
Current sensor failure(inverter PCB)
Power module automatically stop (overcurrent, low voltage, short circuit)
Abnormal inverter fin thermister, abnormal outdoor fan
Inverter PCB failure
Abnormality of fan controller (overcurrent, low voltage, short circuit)
Fin thermistor failure, heat exchanger clogging, fan motor failure
Fan motor failure
Failure of current sensor (instantaneous overcurrent,
increase of fin temperature, low voltage, earth fault, step-out)
31
Leading Cause
,
inverter failure)