Daikin AKZ9 Series User Manual

40
Maintenance
Troubleshooting
Alarm
code
Alarm
level
Description Cause Corrective action
Th4: Inlet oil temperature
thermistor
Th2: Outlet oil temperature
thermistor
Inlet oil temperature is higher
than 60˚C.
FH 2
JH 2
If the exhaust air temperature is almost equal to the room
temperature regardless of the compressor operation, it is possible
that the refrigerant gas has leaked. Contact DAIKIN Contact Center.
Identify the thermistor that indicates the error in the monitor
mode on the operation panel (“-99.9” is displayed), and check
the sensor wiring.
<Emergency Operation>
1) Malfunction of inlet oil temperature thermistor:
Emergency operation is available when the operation mode
is 1, 5, 6, or 9.
2) Malfunction of outlet oil temperature thermistor:
Emergency operation is available when the operation mode
is 0, 3, 4 or 9.
(See page to change the operation mode.)
1) The oil temperature thermistor required
for control is disconnected or short-
circuited.
Discharge pipe temperature
thermistor error
EV valve outlet temperature
thermistor error
Condenser temperature
thermistor error
J3 2
J4 2
J6 2
Check the wiring of the relevant thermistor.
Check the wiring of the relevant thermistor.
Check the wiring of the relevant thermistor.
1)
The discharge pipe temperature thermistor
is disconnected or short-circuited.
1) The EV valve outlet temperature thermistor
is disconnected or short-circuited.
1) The condenser temperature thermistor is
disconnected or short-circuited.
INV-temperature control CPU
communication error
LC 2
Replace the control board, or improve the power supply
environment. (Take noise suppressing measures.)
1) Communication failure between the
temperature control microprocessor and
the inverter microprocessor.
Inverter/compressor error
Radiator fin temperature
thermistor error
L0 2
L4 2
Check the wiring of the relevant thermistor.
Replace the control board or compressor.
1) The radiator fin temperature thermistor is
disconnected or short-circuited.
1) The compressor or inverter has a fault.
5) The refrigerant gas has leaked.
Gas shortage
Power supply reverse-phase
connection
Low voltage (Power voltage)
Low voltage (DC voltage on
main Inverter circuit)
Other system communication error
(Slave communication error)
System failure
(EEPROM error)
Optional protection device is
activated. (OP2)
U0 2
U1 1
U2 2
U9 2
UH 2
UJ 1 or 2
Repair the refrigerant pipe, and refill refrigerant.
Exchange any phase of the power supply wiring.
Contact DAIKIN Contact Center.
Replace the control board.
Make sure that any phase is properly connected to the power
supply terminal block.
Check the condition detected with the relevant protection device.
Make sure that the slave communication line is properly connected.
(This error occurs only when the slave does not make response
in master-slave communication.)
1) An error occurred in communication with
a slave.
1) The parameter stored in the control board
is invalid.
1)
The optionally-connected protection device
(or factory-connected device, if it is
incorporated in the unit) has been activated.
1) The refrigerant piping is damaged by
excess vibration during transportation,
resulting in refrigerant gas leak.
1) The power supply is connected in reverse
phase.
2) Open phase
3)
The fuse in the noise filter board has blown.
Make sure that the power voltage is rated voltage.
4) The power voltage is under about 130V.
Turn OFF the power supply, and turn it ON again after two minutes or more.
Frequent turning ON/OFF of the power supply may cause failure of OILCON.
Ensure the power ON time and OFF time is for two minutes or more separately.
Check the insertion and breaking of the signal wire and engine
wire between the filter board and the inverter board.
Check the connection between DCL and connections parts
(DCL1, DCL2) on Inverter board.
1) Circuit protection for surge current restric-
tion is activated because of excess
ON/OFF switching of power supply.
2) Unconnection of DCL
3)
Decrease of the DC voltage of the main cir-
cuit due to breaking of wiring or disconnec-
tion of connector
Make sure that the power supply voltage conforms to the rating.
Check for instantaneous voltage drop at startup of peripheral
equipment.
4) Power voltage sag (interrupt) often occurs.
20-22
Air temperature thermistor
error
(Th5: Machine temperature
tuning thermistor)
(Th3: Room temperature
thermistor)
H1 2
1) The air temperature thermistor required
for control is disconnected or short-circuit-
ed.
Identify the thermistor that indicates the error in the monitor mode on the
operation panel (
“ -99.9 ” is displayed), and check the thermistor wiring.
<Emergency Operation>
1) Malfunction of machine temperature tuning thermistor:
Emergency operation is available when the operation mode is 0, 1, 3, 5, or 9.
2) Malfunction of room temperature tuning thermistor:
Emergency operation is available when the operation mode is 0, 1, 4, 6, or 9.
(See page to change the operation mode.)
20-22
PIM00318A_EN.fm Page 40 Tuesday, October 26, 2010 12:37 PM

Daikin AKZ9 Series Specifications

General

Brand	Daikin
Model	AKZ9 Series
Category	Air Conditioner
Language	English