LCD Contents of inferior phenomena
P~9 Malfunction outdoor unit Fb Malfunction indoor unit U~UP Malfunction outdoor unit
F3~F9 Malfunction outdoor unit
E0~E5 Remote controller transmitting error E6~EF Indoor/outdoor unit communication error
---- No error history FFFF No applied unit
See the table below for details of the LED display (LED , 2, 3) on the indoor controller board.
LED (microcomputer power supply) Lits when power is supplied.
LED2 (remote controller) Lits when power is supplied for wired remote controller.
The indoor unit should be connected to the outdoor unit with address "0" setting.
LED3 (indoor/outdoor communication) Blink when indoor and outdoor unit are communicating.
1. How To Proceed "Self-Diagnosis"
1-1. When a Problem Occurs During Operation
If a problem occurs in the air conditioner, the indoor and outdoor units will stop, and the problem is shown in the remote controller display.
[CHECK] and the refrigerant address are displayed on the temperature display, and the error code and unit number are displayed alternately as shown below.
(If the outdoor unit is malfunctioning, the unit number will be "00".) In the case of group control, for which one remote controller controls
multiple refrigerant systems, the refrigerant address and error code of the unit that first experienced trouble (i.e., the unit that transmitted the error code) will be displayed.
To clear the error code, press the ON/OFF button.
When using remote operation of remote/local combined control, clear the error code by pressing the button on remote controller after changing operation from remote to local. ON/OFF
During central control by a MELANS controller, clear the error code by pressing the button on MELANS
remote controller. ON/OFF
1-2. Self-Diagnosis During Maintenance or Service
Since each unit has a function that stores error codes, the latest check code can be recalled even if it is cancelled by the remote controller or power is shut off.
Check the error code history for each unit using the remote controller.
Switch to self-diagnosis mode.
Press the CHECK button twice within 3 seconds. The display content will change as shown below.
Set the unit number or refrigerant address you want to diagnose.
Press the [TEMP] buttons ( and ) to select the desired number or address. The number (address) changes between [01] and [50] or [00]
Display self-diagnosis results.
<When there is error code history>
(For the definition of each error code, refer to the indoor unit's installation manual or service handbook.)
Reset the error history.
Error code (2 or 4 digits)
(Alternating Display)
Address (3 digits) or unit number (2 digits)
The refrigerant address will begin to blink approximately 3 seconds after being
selected and the self-diagnosis process will begin.
Unit number or refrigerant address to be diagnosed
Error code (2 or 4 digits)
(Alternating Display)
Address (3 digits) or unit number (2 digits)
<When there is no error code history> <When there is no corresponding unit>
and [15].
* . Self-Diagnosis by the Remote Controller (for Mr.SLIM)
*. Self-DiagnosisbytheRemoteController(forMr.SLIM)
Transmission data from remote controller Transmission data on transmission path
When the number of data errors is "02":
Press the ON/OFF button twice within 3 seconds. The self-diagnosis address or refrigerant address will blink.
When the error history is reset, the display will look like the one shown below.
However, if you fail to reset the error history, the error content will be displayed again.
Cancel self-diagnosis.
Self-diagnosis can be cancelled by the following 2 methods.
Press the CHECK button twice within 3 seconds. Self-diagnosis will be cancelled and the screen will return to the previous state in effect before the start of self-diagnosis.
Press the ON/OFF button. Self-diagnosis will be cancelled and the indoor unit will stop.
1-3. Remote Controller Diagnosis
If the air conditioner cannot be operated from the remote controller, diagnose the remote controller as explained below.
First, check that the power-on indicator is lit.
If the correct voltage (DC12 V) is not supplied to the remote controller, the indicator will not light.
If this occurs, check the remote controller's wiring and the indoor unit.
Switch to the remote controller self-diagnosis mode.
Press the CHECK button for 5 seconds or more. The display content will change as shown below.
Press the FILTER button to start self-diagnosis.
Remote controller self-diagnosis result
[When the remote controller is functioning correctly]
Check for other possible causes, as there is no problem with the remote controller.
[When the remote controller malfunctions]
(Error display 1) "NG" blinks. ©The remote controller's transmitting-receiv- ing circuit is defective.
The remote controller must be replaced with a new one.
[Where the remote controller is not defective, but cannot be operated.]
(Error display 2) [E3], [6833] or [6832] blinks. © Transmission is not possible.
There might be noise or interference on the transmission path, or the indoor unit or other remote controllers are defective. Check the transmission path and other controllers.
(Error display 3) "ERC" and the number of data errors are displayed.
© Data error has occurred.
The number of data errors is the difference between the number of bits sent from the remote controller and the number actually transmitted through the transmis- sion path. If such a problem is occurring, the transmitted data is affected by noise, etc. Check the transmission path.
To cancel remote controller diagnosis
Press the CHECK button for 5 seconds or more. Remote controller diagnosis will be cancelled, "PLEASE WAIT" and operation lamp will blink. After approximately 30 seconds, the state in effect before the diagnosis will be restored.
Power on indicator
F3F5 F9 (EA) (Eb) (EC) E6 E7
(E8) (E9) E0 E3 E4 E5 EF
Ed
A0~A8 [Display]
(1)Normal condition
(2)Abnormal condition
Unit condition Outdoor controller board A-Control Service Tool
LED1 (Green) LED2 (Red) Error code
When the power is turned on When unit stops
When compressor is warming up When unit operates
Lighted Lighted
Lighted Lighted Lighted
Not lighted
Indication of the display Alternately blinking display
Operation mode Not lighted
Lighted
00, etc.
08, etc.
C5, H7 etc.
Indication Error
Error code 1
Outdoor controller board Contents Inspection method
LED1 (Green) LED2 (Red) 1 blinking 2 blinking
2 blinking 1 blinking
2 blinking
3 blinking
4 blinking
5 blinking
Connector(63L) is open.
Connector(63H) is open.
2 connectors are open.
Startup time over
Error code is not defined.
Miswiring of indoor/outdoor unit conne- cting wire, excessive number of indoor units (4 units or more)
Miswiring of indoor/outdoor unit co- nnecting wire (converse wiring or di- sconnection)
Indoor/outdoor unit communication error (signal receiving error) is detected by in- door unit.
Indoor/outdoor unit communication error (transmitting error) is detected by indoor unit.
Indoor/outdoor unit communication error (signal receiving error) is detected by outdoor unit.
Indoor/outdoor unit communication error (transmitting error) is detected by outdoor unit.
Remote controller signal receiving error is detected by remote controller.
Remote controller transmitting error is detected by remote controller.
Remote controller signal receiving error is detected by indoor unit.
Remote controller transmitting error is detected by indoor unit.
Serial communication error
<Communication between outdoor controller board and outdoor power board>
<Communication between outdoor controller board and M-NET P.C. board>
Communication error of M-NET system
1.Error code displayed on remote controller.Error codes given in ( ) are not displayed on remote controller.
Check if indoor/outdoor connecting wire is connected correctly.
Check if 4 or more indoor units are connected to outdoor unit.
Check if noise entered into indoor/outdoor connecting wire or power supply.
Re-check error by turning off power, and on again.
Check if connector (63L or 63H) on the outdoor controller board is not disconnected.
Check continuity of pressure switch (63L or 63H) by tester.
Check if connector (CN4) on outdoor controller board and outdoor power board is not disconnected.
Check if there is poor connection of connector on outdoor controller board(CNMNT and CNVMNT).
Check M-NET communication signal.
Check if remote controller is MA remote controller(PAR-21MAA).
Check if noise entered into transmission wire of remote controller.
Check if noise entered into indoor/outdoor connecting wire.
Re-check error by turning off power, and on again.
Check if connecting wire of indoor unit or remote controller is connected correctly.
Check if noise entered into transmission wire of remote controller.
Re-check error by turning off power, and on again.
Check if indoor/outdoor connecting wire is connected correctly.
Check if noise entered into indoor/outdoor connecting wire or power supply.
Check if noise entered into indoor/outdoor controller board.
Re-check error by turning off power, and on again.
<Display function of inspection for outdoor unit>
The blinking patterns of both LED(green) and LED2(red) indicate the types of abnormality when it occurs. Types of
abnormality can be indicated in details by connecting an optional part A-Control Service Tool (PAC-SK52ST) to connector CNM on outdoor controller board.
2.Error Code List (for Mr.SLIM)
Indication Error Outdoor controller board
Contents Error
codeW Inspection method
LED (Green) LED2 (Red)
3 blinking blinking Abnormality of shell thermistor (TH32)
and discharging temperature (TH4) U2 1Check if stop valves are open.
2Check if connectors (TH4, TH32, LEV-A and LEV-B) on outdoor controller board are not disconnected.
3Check if unit fills with specified amount of refrigeran 4Measure resistance values among terminals on indoor
valve and outdoor linear expansion valve with a tester.
Abnormality of superheat due to low dis-
charge temperature U7
2 blinking Abnormal high pressure (High pressure
switch 63H worked.) U 1Check if indoor/outdoor units have a short cycle on their air ducts.
2Check if connector (63H) on outdoor controller board is not disconnected.
3Check if heat exchanger and filter is not dirt .
4Measure resistance values among terminals on linear expansion valve with a tester.
3 blinking Abnormality of outdoor fan motor rotational
speed U8 1Check the outdoor fan motor.
Protection from overheat operation (TH3) Ud 4 blinking Compressor over current breaking (Start-up
locked) UF 1Check if stop valves are open.
2Check looseness, disconnection, and converse con- nection of compressor wiring.
3Measure resistance values among terminals on com- pressor with a tester.
4Check if outdoor unit has a short cycle on its air duct.
Compressor over current breaking UP Abnormality of current sensor (P.B.) UH
Abnormality of power module U6
5 blinking Open/short of discharge thermistor (TH4)
and shell thermistor (TH32) U3 1Check if connectors (TH3, TH4, TH7/6, TH32) on out- door controller board and connector (CN3) on outdoor power board are not disconnected.
2Measure resistance value of outdoor thermistors Open/short of outdoor thermistors
(TH3, TH6, TH7 and TH8) U4
6 blinking Abnormality of heatsink temperature U5 1Check if indoor/outdoor units have a short cycle on their air ducts.
2Measure resistance value of outdoor thermistor(TH8).
7 blinking Abnormality of voltage U9 1Check looseness, disconnection, and converse con- nection of compressor wiring.
2Measure resistance value among terminals on com- pressor using a tester.
3Check the continuity of contactor (52C).
4Check if power supply voltage decreases.
5Check the wiring of CN52C.
6Check the wiring of CNAF.
4 blinking blinking Abnormality of room temperature thermis-
tor (TH) P 1Check if connectors (CN20, CN2, CN29 and CN44)
on indoor controller board are not disconnected.
2Measure resistance value of indoor thermistors.
Abnormality of pipe temperature thermistor
/Liquid (TH2) P2
Abnormality of pipe temperature thermis-
tor/Condenser-Evaporator P9
2 blinking Abnormality of drain sensor (DS)
Float switch (FS) connector open P4 1Check if connector (CN3,CN4F) on indoor controller board is not disconnected.
2Measure resistance value of indoor thermistors.
3Measure resistance value among terminals on drain-up machine using a tester.
4Check if drain-up machine works.
5Check drain function.
Indoor drain overflow protectio P5
3 blinking Freezing (cooling)/overheating (heating)
protection P6 1Check if indoor unit has a short cycle on its air duct.
2Check if heat exchanger and filter is not dirt . 3Measure resistance value on indoor and outdoor fan
motors.
4Check if the inside of refrigerant piping is not clogged.
4 blinking Abnormality of pipe temperature P8 1Check if indoor thermistors (TH2 and TH5) are not disconnected from holder.
2Check if stop valve is open.
3Check converse connection of extension pipe. (on plural units connection)
4Check if indoor/outdoor connecting wire is connected correctly. (on plural units connection)
5 blinking Abnormality of Indoor controller board Fb 1Replace indoor controller board.
— — Abnormality of remote controller board E, E2 Replace the remote controller.
Turn on the [Monitoring the operation data]
(1) (2) (3)
(4)
(5)
(6) (7)
(1) Press the TEST button for 3 seconds so that [Maintenance mode] appears on the screen (at ).
(2) Press the CHECK button for 3 seconds to switch to [Maintenance monitor].
Note) It is not possible to switch to [Maintenance monitor] during data request in maintenance mode (i.e., while "- - - -" is blinking), since no buttons are operative.
Operating the service inspection monitor
- - - ] appears on the screen (at ) when [Maintenance monitor] is activated.
(The display (at ) now allows you to set a request code No.)
(3) Press the [TEMP] buttons ( and ) to select the desired refrigerant address.
[Screen ]
(4) Press the [CLOCK] buttons ( and ) to set the desired request code No.
(5) Press the FILTER button to perform data request.
(The requested data will be displayed at in the same way as in maintenance mode.) Data collected during operation of the remote controller will be displayed.
The collected data such as temperature data will not be updated automatically even if the data changes.
To display the updated data, carry out step (4) again.
Canceling the Monitoring the operation data
(6) While [Maintenance monitor] is displayed, press the CHECK button for 3 seconds to return to maintenance mode.
(7) To return to normal mode, press the ON/OFF button.
Example) Request code "004"
Discharge temperature 69°C Refrigerant address "00"
B: Refrigerant address C: Data display area D: Request code display area
[
( . Monitoring the Operation Data by the Remote Controller (for Mr. SLIM PUHZ series)
1.How to "Monitor the Operation Data"
(. MonitoringtheOperationDatabytheremoteController(forMr.SLIM)