Technical Information

Troubleshooting
TCGB0079 rev.0 - 01/2013
151
Code
number
Category Abnormality Cause
41
Pressure
Cooling overload (possible activation of high
pressure device)
O.U. pipe thermistor temp. is higher than 55 ºC and the
compressor top temp. is higher than 95 ºC, O.U. protection
device is activated.
42
Heating overload (high-pressure device may
be activated)
If I.U. freeze protection thermistor temp. is higher than
55 ºC and compressor top temp. is higher than 95 ºC, O.U.
protection device is activated.
43
Activation of the safety device from com-
pression ratio decrease
Abnormal compress (Compressor, Inverter damage)
44
Activation of the safety device from exces-
sively high suction pressure
Overload during cooling, high temperature with heating,
loked expansion valve
45
Activation of the safety device from exces-
sively high discharge pressure
Overload (obstruction of HEX, short circuit) mixture of inert
gas
47
Activation of the safety device from exces-
sively low suction pressure (protection from
vacuum operation)
Shortage or leakage of refrigerant, piping clogging, expan-
sion valve close-locked, fan motor locked.
48
Inverter
Abnormality of current sensor for inverter
Failure of DIP-IPM, heat exchanger clogged, locked com-
pressor, EVI/EVO failure or overcharge.
51 Abnormality of Current Sensor for Inverter Failure of control PCB, inverter module.
53 Protection activation of inverter module
Inverter module abnormality.
Failure of compressor, clogging of heat exchanger.
54 Inverter n temperature increase
Abnormal inverter n thermistor, clogging of heat exchang-
er, abnormal outdoor fan.
55 Inverter Module abnormality Failure of inverter module.
57 Outdoor fan Fan Motor abnormality
Disconnected wire of incorrect wiring between control PCB
and inverter PCB.
Incorrect wiring or fan motor abnormality.
b1
Indoor unit
number setting
Incorrect setting of the unit and the refriger-
ant cycle number.
Over 64 indoor units setting by number or indoor unit ad-
dress.
b5
Incorrect indoor unit connection number
setting
There are more than 17 units not corresponding to H-Link
II connected to one system
EE Compressor Compressor protection Failure of compressor.
11
TCGB0079_rev0_11-2012.indb 151 29/01/2013 14:27:46