Mitsumi electronic PLA-A36AA, PLA-A30AA Cause Countermeasure Pipe temperature thermistor

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Error Code

Abnormal point and detection method

Cause

Countermeasure

 

 

 

 

 

 

Pipe temperature thermistor /

1 Defective thermistor

13Check resistance value of thermistor.

 

Condenser-Evaporator (TH5)

characteristics

For characteristics, refer to (P1) above.

 

1 The unit is in 3-minute resume protec-

2 Contact failure of connector

2 Check contact failure of connector (CN29)

 

tion mode if short/open of thermistor is

(CN29) on the indoor controller

on the indoor controller board. Refer to 10-7.

 

detected. Abnormal if the unit does not

board (Insert failure)

Turn the power on and check restart after

 

get back to normal within 3 minutes.

3 Breaking of wire or contact

inserting connector again.

 

 

4 Operate in test run mode and check pipe

 

(The unit returns to normal operation, if

failure of thermistor wiring

 

<condenser / evaporator> temperature with

 

it has been reset normally.)

4 Temperature of thermistor is

 

outdoor controller circuit board. If pipe

 

 

2 Constantly detected during cooling, dry-

90:(194˚F) or more or -40:

 

 

<condenser / evaporator> temperature is

 

ing, and heating operation (except

(-40˚F) or less caused by

extremely low (in cooling mode) or high (in

 

defrosting)

defective refrigerant circuit.

heating mode), refrigerant circuit may have

 

Short: 90:(194˚F) or more

5 Defective indoor controller

defect.

 

P9

Open: -40:(-40˚F) or less

board

5 Operate in test run mode and check pipe

 

 

 

<condenser / evaporator> temperature with

 

 

 

outdoor control circuit board. If there is

 

 

 

exclusive difference with actual pipe

 

 

 

 

<condenser / evaporator> temperature

 

 

 

 

replace indoor controller board.

 

 

 

 

There is no abnormality if none of above

 

 

 

comes within the unit.

 

 

 

 

Turn the power off and on again to operate.

 

 

 

In case of checking pipe temperature

)

 

 

 

with outdoor controller circuit board,

 

 

 

be sure to connect A-control service

 

 

 

(tool (PAC-SK52ST).

 

Remote controller transmission

1 Contact failure at transmission

1 Check disconnection or looseness of indoor

 

error(E0)/signal receiving error(E4)

wire of remote controller

unit or transmission wire of remote controller.

 

1 Abnormal if main or sub remote con-

2 All remote controllers are set

2 Set one of the remote controllers “main”

 

troller cannot receive any transmission

as “sub” remote controller. In

if there is no problem with the action above.

 

normally from indoor unit of refrigerant

this case, E0 is displayed on

3 Check wiring of remote controller.

 

 

• Total wiring length: max. 500m

 

 

address “0” for 3 minutes.

remote controller, and E4 is

 

 

(Do not use cable o 3 or more)

 

 

(Error code : E0)

displayed at LED (LED1, LED2)

 

 

• The number of connecting indoor units:

 

2 Abnormal if sub-remote controller could

on the outdoor controller circuit

 

max. 16 units

 

 

not receive for any signal for 2 minutes.

board.

 

 

• The number of connecting remote con-

 

(Error code: E0)

3 Miswiring of remote controller

 

troller: max. 2 units

 

 

1 Abnormal if indoor controller board can

4 Defective transmitting receiving

 

 

E0

circuit of remote controller

When the above-mentioned problem 1~3 are not seen.

not receive any data from remote con-

5 Defective transmitting receiving

4 Diagnose remote controllers.

 

or

 

troller board or normally from other

circuit of indoor controller board

a) When “RC OK” is displayed,

 

E4

indoor controller board for 3 minutes.

of refrigerant address “0”

remote controllers have no problem.

 

 

Turn the power off, and on again to

 

 

(Error code: E4)

6 Noise has entered into the

 

 

check. If abnormality generates again,

 

2 Indoor controller board cannot receive

transmission wire of remote

 

replace indoor controller board.

 

 

any signal from remote controller for 2

controller.

 

 

b) When “RC NG” is displayed,

 

 

minutes. (Error code: E4)

 

replace remote controller.

 

 

 

 

c) When “RC E3” is displayed,

 

 

 

 

d) When “ERC 00-06” is displayed,

 

 

 

 

[ c),d)Noise may be causing abnormality. ]

 

 

 

If the unit is not normal after replacing

 

 

 

indoor controller board in group control,

 

 

 

the indoor controller board of address

 

 

 

“0” may be abnormal.

 

 

Remote controller transmission

1 2 remote controller are set as

1 Set a remote controller to main, and the

 

error(E3)/signal receiving error(E5)

“main.” (In case of 2 remote

other to sub.

 

 

1 Abnormal if remote controller could not

controllers)

 

 

 

find blank of transmission path for 6 sec-

2 Remote controller is connected

2 Remote controller is connected with only 1

 

onds and could not transmit.

with 2 indoor units or more.

indoor unit.

 

 

(Error code: E3)

 

 

3 Repetition of refrigerant

3 The address changes to a separate setting.

 

2 Remote controller receives transmitted

 

data at the same time, compares the

address

 

 

E3

data, and when detecting it, judges

4 Defective transmitting receiving

4~6 Diagnose remote controller.

 

different data to be abnormal 30

circuit of remote controller

a) When “RC OK” is displayed, remote con-

or

continuous times. (Error code: E3)

5 Defective transmitting receiving

trollers have no problem.

 

E5

1 Abnormal if indoor controller board could

circuit of indoor controller board

Turn the power off, and on again to check.

 

When becoming abnormal again, replace

 

6 Noise has entered into trans-

 

not find blank of transmission path.

indoor controller board.

 

 

mission wire of remote controller.

 

 

(Error code: E5)

b)When “RC NG” is displayed, replace

 

 

2 Indoor controller board receives trans-

 

remote controller.

 

 

mitted data at the same time, compares

 

c)When “RC E3” or “ERC 00-66” is displayed,

 

the data,and when detecting it, judges

 

noise may be causing abnormality.

 

 

different data to be abnormal 30

 

 

 

 

continuous times. (Error code: E5)

 

 

 

 

 

 

 

 

20

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Contents Contents Revised EDITION-BTechnical Data Book Technical ChangesReference Manual PLA-A12AA PLA-A18AA PLA-A24AA PLA-A30AA PLA-A36AA PLA-A42AASafety Precaution Always Observe for SafetyAdditional refrigerant charge Part Names and Functions Indoor UnitDisplay Section Wireless remote controller PLA-A24AA/ PLA-A24AA1Single phase,60Hz, 208/230V SpecificationsService Ref PLA-A42AA/ PLA-A42AA1Single phase,60Hz, 208/230V PLA-A30AA/ PLA-A30AA1Single phase,60Hz, 208/230VPLA-A36AA/ PLA-A36AA1Single phase,60Hz, 208/230V Noise Criterion Curves PLA-A12AAPLA-A12AA1 PLA-A36AAOutlines and Dimensions Unit inchmmWiring Diagram Please set the voltage usingRefrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingMALFUNCTION-DIAGNOSIS Method by Remote Controller Case of trouble during operationOutput pattern B Only A-CONTROL Please Wait SELF-DIAGNOSIS Action Table Working Pipe temperatureCause Countermeasure Freezing/overheating protection is Cause Countermeasure Pipe temperature thermistor Remote controller transmissionErrorE0/signal receiving errorE4 ErrorE3/signal receiving errorE5Error Signal receiving error Error Transmitting errorRemote controller control board Indoor controller boardTroubleshooting by Inferior Phenomena Phenomena Cause CountermeasureIs off Ply system4Receiver for wireless remote Is blinking3Upward/downward vane Performance failureEmergency Operation Fan motor MF Thermistor for lower temperature Test Point Diagram Indoor controller board Functions of DIP Switch and Jumper Wire SW2Disassembly Procedure Operating Procedure Photos & IllustrationsRemoving the fan motor Removing the drain pump and drain sensor Wiring Recom QtyPLA-A·AA Functional and Structural Parts PLA-A36AA98 PLA-A42AA 12, 18, 24 Symbol Qty MendedFunctional and Structural Parts PLA-A36AA PLA-A42AA 556RoHS Parts List 30/36/42AA1Wiring Symbol QtyFunctional and Structural Parts PLA-A18AA1 PLA-A24AA1PLA-A30AA1PLA-A36AA198 RoHS Parts No Parts Name Functional and Structural Parts PLA-A36AA1 PLA-A42AA1 RemarksPage Made in Japan

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