Mitsubishi Electronics PCA-A24GA service manual Cause Countermeasure Pipe temperature thermistor

Page 17

Error Code

Abnormal point and detection method

Cause

Countermeasure

 

 

 

 

 

 

Pipe temperature thermistor /

1 Defective thermistor

1–3Check 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 10-6.

 

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)

 

 

 

 

 

 

 

 

17

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Contents Revised EDITION-B ContentsPCA-A24GA PCA-A30GAReference Manual Technical Data BookTechnical Changes Always Observe for Safety Safety PrecautionAdditional refrigerant charge When charging directly from cylinderIndoor Unit Part Names and FunctionsDisplay Section Mode Select button Operation Mode displayTemperature setting display Timer displayService Ref SpecificationsPCA-A30GA, PCA-A30GA1Single phase, 60Hz, 208/230V PCA-A36GA, PCA-A36GA1Single phase, 60Hz, 208/230VPCA-A24GA1 Noise Criterion CurvesPCA-A30GA1 PCA-A36GA1PCA-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 Working Pipe temperatureCause Countermeasure Freezing/overheating protection is Remote controller transmission Cause Countermeasure Pipe temperature thermistorErrorE0/signal receiving errorE4 ErrorE3/signal receiving errorE5Error Transmitting error Error Signal receiving errorRemote controller control board Indoor controller boardPhenomena Cause Countermeasure Troubleshooting by Inferior PhenomenaIs off Ply systemIs blinking 4Receiver for wireless remote3Upward/downward vane Performance failurePage Vane motor MV Connect to the indoor controller board CN2D Test Point DiagramBetween 1 to 3 12.6-13.7V DC Pin1 + PCA-A36GA PCA-A36GA1 Models Functions of DIP Switch and Jumper WireOperating Procedure Photos & Illustrations Disassembly ProcedureRemoving the air intake grille Removing the electrical boxRemoving the fan motor MF Operating ProcedureRemoving the sirocco fan Remove the air intake grilleRemoving the vane motor MV Operating Procedure PhotosRemoving the Indoor coil thermistor TH2/TH5 Removing the Under panelRemoving the guide vane Removing the drain panRemove the intake grille. See the figure Removing the Auto vaneRemoving the heat exchanger Drawing No Parts No Parts Name SpecificationsR01 29J 130 R01 35J 130Structural Part PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA Electrical Parts PCA-A24GA PCA-A30GA PCA-A36GA PCA-A42GA RoHS Parts Name SpecificationsRemarks Parts NoStructural Part PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1 RoHS Qty/ set Wiring RecomElectrical Parts PCA-A24GA1PCA-A30GA1PCA-A36GA1PCA-A42GA1

PCA-A24GA specifications

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