Mitsubishi PUHZ-RP60VHA Service Manual download pdf (Page 52)

Error Code

Abnormal points and detection method

Judgment and action

(1300)

Low pressure

Abnormal if the following conditions are

detected for continuously 3 minutes after

compressor starts heating operating for 10

minutes.

1. Heating mode

Detection mode1

TH7-TH3[4: and

TH5-Indoor room temperature[2:

Detection mode2

TH7-TH3[2:and

TH5-Indoor room temperature[4: and

TH2-Indoor room temperature[4:

2.Cooling mode

TH6-TH7[2: and

TH3-TH7[2: and

Indoor room temperature - Indoor liquid

pipe temperature (TH2)[5:

Thermistor TH3:

Outdoor liquid pipe temperature

TH5:

Indoor cond./eva. temperature

TH7:Outdoor temperature

1 Stop valve of outdoor unit is

closed during operation.

2 Leakage or shortage of refriger-

ant

3 Malfunction of linear expansion

valve

4Clogging with foreign objects in

refrigerant circuit

wClogging occurs in the parts

which become below freezing

point when water enters in

refrigerant circuit.

1 Check stop valve.

2 Check intake superheat.

Check leakage of refrigerant.

Check additional refrigerant.

3 Check linear expansion valve.

Refer to 11-6.

4 After recovering refrigerant, remove water

from entire refrigerant circuit under vacuum

more than 1 hour.

Case

(5300)

Current sensor error

Abnormal if current sensor detects –1.5A to

1.5A during compressor operation. (This

error is ignored in case of test run mode.)

1 Disconnection of compressor

wiring

2 Defective circuit of current sen-

sor on outdoor power circuit

board

1 Correct the wiring (U

•V•W phase) to compres-

sor. Refer to 11-9 (Outdoor power circuit

board).

2 Replace outdoor power circuit board.

(4210)

Compressor overcurrent interruption

Abnormal if overcurrent DC bus or com-

pressor is detected after compressor starts

operating for 30 seconds.

1 Stop valve of outdoor unit is

closed.

2 Decrease of power supply volt-

age

3 Looseness, disconnection or

converse of compressor wiring

connection

4 Defective fan of indoor/outdoor

units

5 Short cycle of indoor/outdoor

units

6 Defective input circuit of out-

door controller board

7 Defective compressor

1Open stop valve.

2 Check facility of power supply.

3 Correct the wiring (U

•V•W phase) to com-

pressor. Refer to 11-9 (Outdoor power circuit

board).

4 Check indoor/outdoor fan.

5Solve short cycle.

6Replace outdoor controller circuit board.

7Check compressor. Refer to 11-6.

W Before the replacement of the outdoor controller cir-

cuit board, disconnect the wiring to compressor from

the outdoor power circuit board and check the out-

put voltage among phases, U, V, W, during test run.

No defect on board if voltage among phases (U-V,

V-W and W-U) is same. Make sure to perform the

voltage check with same performing frequency.

Remote controller transmission

error(E0)/signal receiving error(E4)

1 Abnormal if main or sub remote con-

troller cannot receive normally any trans-

mission from indoor unit of refrigerant

address “0” for 3 minutes.

(Error code : E0)

2 Abnormal if sub remote controller could

not receive any signal for 2 minutes.

(Error code: E0)

1 Abnormal if indoor controller board can

not receive normally any data from

remote controller board or from other

indoor controller board for 3 minutes.

(Error code: E4)

2 Indoor controller board cannot receive

any signal from remote controller for 2

minutes. (Error code: E4)

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.

2 Set one of the remote controllers “main” if

there is no problem with the action above.

3 Check wiring of remote controller.

• Total wiring length: max. 500m

(Do not use cable o 3 or more.)

• The number of connecting indoor units:

max. 16units

• The number of connecting remote con-

troller: max. 2units

When it is not the above-mentioned problem of

1~3

4 Diagnose remote controllers.

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

trollers have no problem. Turn the power

off, and on again to check. If abnormality

generates again, replace indoor controller

board.

b) When “RC NG” is displayed, replace

remote controller.

When “RC E3” or “ERC 00-66” is dis-

played, noise may be causing abnormality.

∗ If the unit is not normal after replacing indoor

controller board in group control, indoor con-

troller board of address “0” may be abnormal.

1 Contact failure at transmission

wire of remote controller

2 All remote controllers are set

as “sub” remote controller. In

this case, E0 is displayed on

remote controller, and E4 is

displayed at LED (LED1,

LED2) on the outdoor con-

troller circuit board.

3 Miswiring of remote controller

4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller

board of refrigerant address “0”

6 Noise has entered into the

transmission wire of remote

controller.

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Mitsubishi PUHZ-RP60VHA Service Manual Page 52

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