Mitsubishi Electronics PCA-A24GA service manual SELF-DIAGNOSIS Action Table

Page 15

10-2. SELF-DIAGNOSIS ACTION TABLE

Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E.

Error Code

Abnormal point and detection method

Cause

Countermeasure

 

 

 

 

 

Room temperature thermistor (TH1)

1 Defective thermistor

1–3Check resistance value of thermistor.

 

1 The unit is in 3-minute resume preven-

characteristics

0: (32˚F)• • • • • • • • • • • 15.0k"

 

tion mode if short/open of thermistor is

2 Contact failure of connector

10:(50˚F)• • • • • • • • • • • • • 9.6k"

 

detected. Abnormal if the unit does not

(CN20) on the indoor controller

20:(68˚F)• • • • • • • • • • • • • 6.3k"

 

reset normally after 3 minutes. (The

board (Insert failure)

30:(86˚F)• • • • • • • • • • • • • 4.3k"

 

unit returns to normal operation, if it

3 Breaking of wire or contact

40:(104˚F)• • • • • • • • • • • •3.0k"

 

has been reset normally.)

failure of thermistor wiring

If you put force on (draw or bend) the lead wire

 

2 Constantly detected during cooling,

4 Defective indoor controller

with measuring resistance value of thermistor

 

drying, and heating operation.

board

breaking of wire or contact failure can be detected.

P1

Short: 90:(194˚F) or more

 

2 Check contact failure of connector (CN20) on

 

Open: -40:(-40˚F) or less

 

the indoor controller board. Refer to 10-6.

 

 

 

Turn the power on again and check restart

 

 

 

after inserting connector again.

 

 

 

4 Check room temperature display on remote

 

 

 

controller.

 

 

 

Replace indoor controller board if there is abnor-

 

 

 

mal difference with actual room temperature.

 

 

 

Turn the power off, and on again to operate

 

 

 

after check.

 

Pipe temperature thermistor/Liquid

1 Defective thermistor

1–3Check resistance value of thermistor.

 

(TH2)

characteristics

For characteristics, refer to (P1) above.

 

1 The unit is in 3-minute resume

2 Contact failure of connector

2 Check contact failure of connector (CN21) on

 

prevention mode if short/open of

(CN21) on the indoor controller

the indoor controller board. Refer to 10-6.

 

thermistor is detected. Abnormal if the

board (Insert failure)

Turn the power on and check restart after

 

unit does not reset normally after 3 min-

3 Breaking of wire or contact

inserting connector again.

 

utes. (The unit returns to normal opera-

failure of thermistor wiring

4 Check pipe <liquid> temperature with remote

 

tion, if it has been reset normally.)

4 Defective refrigerant circuit is

controller in test run mode. If pipe <liquid>

P2

2 Constantly detected during cooling,

causing thermistor temperature

temperature is extremely low (in cooling

drying, and heating (except defrosting)

of 90:(194˚F) or more or

mode) or high (in heating mode), refrigerant

 

 

operation.

-40:(-40˚F) or less.

circuit may have defect.

 

Short: 90:(194˚F) or more

5 Defective indoor controller board

5 Check pipe <liquid> temperature with remote

 

Open: -40:(-40˚F) or less

 

controller in test run mode. If there is extreme

 

 

 

difference with actual pipe <liquid> temperature,

 

 

 

replace indoor controller board.

 

 

 

Turn the power off, and on again to operate

 

 

 

after check.

 

 

 

 

 

Drain sensor (DS)

1 Defective thermistor

1–3Check resistance value of thermistor.

 

1 Suspensive abnormality, if short/open of

characteristics

0: (32˚F)• • • • • • • • • • • • 6.0k"

 

thermistor is detected for 30 seconds

2 Contact failure of connector

10:(50˚F)• • • • • • • • • • • • 3.9k"

 

continuously.

(CN31) on the indoor controller

20:(68˚F)• • • • • • • • • • • • 2.6k"

 

Turn off compressor and indoor fan.

board (Insert failure)

30:(86˚F)• • • • • • • • • • • • 1.8k"

 

2 Short/open is detected for 30 seconds con-

 

3 Breaking of wire or contact

40:(104˚F)• • • • • • • • • • 1.3k"

 

tinuously during suspensive abnormality.

failure of drain sensor wiring

2 Check contact failure of connector (CN31) on

 

(The unit returns to normal operation, if

 

4 Defective indoor controller board

the indoor controller board. Refer to 10-6.

P4

it has been reset normally.)

 

Turn the power on again and check restart

3 Detect the following condition.

 

 

 

after inserting connector again.

 

• During cooling and drying operation

 

 

 

4 Replace indoor controller board if drain

 

• In case that pipe <liquid> temperature

 

 

- room temperature <-10deg

 

pump operates with the line of drain sensor

 

(Except defrosting)

 

connector CN31-1and 2 is short-circuited,

 

• When pipe <liquid> temperature or

 

and abnormality reappears.

 

room temperature is short/open tem-

 

Turn the power off, and on again to operate

 

perature.

 

 

 

after check.

 

• During drain pump operation

 

 

 

 

 

Malfunction of drain pump (DP)

1 Malfunction of drain pump

1 Check if drain pump works.

 

1 Suspensive abnormality, if thermistor

2 Defective drain

2 Check drain function.

 

of drain sensor heats itself and

Clogged drain pump

3 Check the setting of lead wire of drain sensor

 

temperature rises slightly. Turn off

Clogged drain pipe

and check clogs of the filter.

 

compressor and indoor fan.

3 Attached drop of water at the

4 Replace indoor controller board if drain

P5

2 Drain pump is abnormal if the condition

drain sensor

pump operates with the line of drain sensor

connector CN31-1and 2 is short-circuited

 

above is detected during suspensive

• Drops of drain trickles from

 

and abnormality reappears.

 

abnormality.

lead wire.

 

Refer to 10-6.

 

3 Constantly detected during drain pump

• Clogged filter is causing

 

 

 

operation.

wave of drain.

Turn the power off, and on again to operate

 

 

4 Defective indoor controller board

 

 

after check.

 

 

 

 

 

 

 

15

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Contents PCA-A30GA ContentsRevised EDITION-B PCA-A24GATechnical Data Book Technical ChangesReference Manual Always Observe for Safety Safety PrecautionAdditional refrigerant charge When charging directly from cylinderIndoor Unit Part Names and FunctionsDisplay Section Timer display Operation Mode displayMode Select button Temperature setting displayPCA-A36GA, PCA-A36GA1Single phase, 60Hz, 208/230V SpecificationsService Ref PCA-A30GA, PCA-A30GA1Single phase, 60Hz, 208/230VPCA-A36GA1 Noise Criterion CurvesPCA-A24GA1 PCA-A30GA1PCA-A24GA PCA-A24GA1 PCA-A30GA PCA-A30GA1 Outlines and DimensionsUnit inchmm PCA-A36GA PCA-A42GA PCA-A36GA1 PCA-A42GA1Indoor unit Installation Manual Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingSELF-DIAGNOSIS Action Table Pipe temperature Cause Countermeasure Freezing/overheating protection isWorking ErrorE3/signal receiving errorE5 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE0/signal receiving errorE4Indoor controller board Error Signal receiving errorError Transmitting error Remote controller control boardPly system Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure Is offPerformance failure 4Receiver for wireless remoteIs blinking 3Upward/downward vanePage Vane motor MV Test Point Diagram Between 1 to 3 12.6-13.7V DC Pin1 +Connect to the indoor controller board CN2D PCA-A36GA PCA-A36GA1 Models Functions of DIP Switch and Jumper WireRemoving the electrical box Disassembly ProcedureOperating Procedure Photos & Illustrations Removing the air intake grilleRemove the air intake grille Operating ProcedureRemoving the fan motor MF Removing the sirocco fanRemoving the Under panel Operating Procedure PhotosRemoving the vane motor MV Removing the Indoor coil thermistor TH2/TH5Removing the Auto vane Removing the drain panRemoving the guide vane Remove the intake grille. See the figureRemoving the heat exchanger R01 35J 130 Parts No Parts Name SpecificationsDrawing No R01 29J 130Structural Part PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Electrical Parts PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Parts No Parts Name SpecificationsRoHS RemarksStructural Part PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1 Wiring Recom Electrical Parts PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1RoHS Qty/ set

PCA-A24GA specifications

Mitsubishi Electronics has long been a pioneer in the field of industrial automation, and the PCA-A24GA is a notable addition to its line of high-performance programmable controllers. This compact yet powerful device is designed to optimize processes and increase efficiency across various applications, making it a preferred choice for industries ranging from manufacturing to building automation.

One of the standout features of the PCA-A24GA is its versatility. The controller offers a wide range of input/output (I/O) options, enabling seamless integration with various sensors and actuators. With 24 digital input channels and 16 relay output channels, the PCA-A24GA can handle complex control tasks while maintaining a compact footprint. This flexibility is further enhanced by its support for analog inputs and outputs, allowing for greater precision in monitoring and controlling processes.

The PCA-A24GA is built with cutting-edge technologies that ensure robust performance. It employs Mitsubishi's advanced processing algorithms, which enhance real-time data processing capabilities. This ensures responsive control, reducing lag and improving overall system performance. Additionally, the controller features an intuitive programming environment, making it accessible to both seasoned engineers and those new to automation programming.

Communications are another strong suit of the PCA-A24GA. It offers multiple communication protocols, including Ethernet and RS-232, which allow for easy connectivity to various devices and systems. This ensures that the PCA-A24GA can be integrated into existing networks without significant modifications, facilitating smoother transitions and upgrades.

In terms of reliability and durability, the PCA-A24GA excels. Designed to operate in demanding environments, it is built to withstand temperature fluctuations, vibrations, and dust, which is essential for industrial settings. The controller's long operational life reduces maintenance costs and downtime, contributing to improved productivity.

Energy efficiency is also a key characteristic of the PCA-A24GA. Mitsubishi Electronics has designed this controller with eco-friendly technologies, making it suitable for organizations looking to reduce their carbon footprint while maintaining high levels of productivity.

In summary, the Mitsubishi Electronics PCA-A24GA stands out with its versatile I/O options, advanced processing capabilities, comprehensive communication protocols, and robust build. These features make it an excellent choice for industries seeking reliable and efficient automation solutions, securing Mitsubishi's reputation as a leader in the field.
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