Hitachi HRNM/FSN(2)(M)(E) Installation And Operation Manual page 49

TROUBLESHOOTING
Code
Category
No.
11 Inlet Air Thermistor
12 Outlet Air Thermistor
Sensor on Indoor
13 Freeze Protection Thermistor
Unit
14 Gas Piping Thermistor
19 Tripping of Protection Device for Fan Motor
20 Compressor Thermistor
Sensor on
22 Outdoor Air Thermistor
Outdoor Unit
24 Evaporating Thermistor
31 Incorrect Setting of Outdoor and Indoor Unit
35 Incorrect Setting in Indoor Unit No.
System
38 Abnormality of Protective Circuit in Outdoor Unit
Overload Cooling
41
(Possibility of high pressure device activation)
Overload Heating
42 Pressure
(Possibility of high pressure device activation)
Activation of Low Pressure Decrease Protection
47
Device
48 Overcurrent Protection Activation
51 Abnormality of Current Sensor for Inverter
53 Protection Activation of IPM or PCB2
Inverter
54 Inverter Fin Temperature Increase
55 IPM or PCB2 Abnormality
57 Outdoor Fan Fan Motor Abnormality
Thermistor of Inverter Fin Abnormality (for Inverter Fin
59 Inverter
Temperature)
Indoor unit No.
b1 Incorrect unit No. Setting
setting
EE Compressor Compressor Protection Alarm
Content of Abnormality Leading Cause
Failure of Thermistor, Sensor, Connection.
Failure of Fan Motor
Failure of Thermistor, Sensor, Connection
Incorrect Setting of Capacity Code.
Duplication of Indoor Unit number
Failure of Indoor Unit PCB. Incorrect wiring. Connection to
PCB in Indoor Unit.
O.U. Pipe Thermistor Temp. is Higher than 55ºC and the
Comp. Top Temp. is Higher than 95ºC when O.U. Protection
Device is activated.
I.U. Freeze Protection Thermistor Temp. is Higher than 55ºC
and the Comp. Top Temp. is Higher than 95ºC when O.U.
Protection Device is activated.
Stoppage by Excessively Decrease of evaporating
Temperature (Te < -35ºC) is activated 3 times in one hour,
Locked Motor in Heating Operation.
Failure of IPM or PCB2, Clogging of Heat Exchanger, Locked
Compressor
Failure of Control PCB, IPM or PCB2
IPM or PCB2 Abnormality
Failure of Compressor, clogging of Heat Exchanger.
Abnormal Inverter Fin Thermistor.
Clogging of Heat Exchanger
Abnormal Outdoor Fan
Failure of IPM or PCB2
Disconnected wire of Incorrect wiring between Control PCB
and Inverter PCB.
Incorrect Wiring or Fan Motor Abnormality
Loose connector, Disconnnected wire short circuit
Over 64 indoor units, setting by No. or indoor unit address.
Failure of Compressor.
PMML0129A rev.4 - 02/2010
51