Error Code

 

Abnormal point and detection method

Case

 

 

Judgment and action

 

 

 

 

 

 

 

Open/short circuit of discharge

1 Disconnection or contact

 

 

1 Check connection of connector (TH4) on the

 

temperature thermistor (TH4)

failure of connector (TH4) on

 

outdoor controller circuit board.

 

Abnormal if open (3: [37˚F] or less) or

the outdoor controller circuit

 

Check breaking of the lead wire for

 

short (217: [422˚F] or more) is detected

board

 

 

thermistor (TH4). Refer to 10-9.

 

during compressor operation.

2 Defective thermistor

 

 

2 Check resistance value of thermistor (TH4) or

U3

(Detection is inoperative for 10 minutes of

3 Defective outdoor controller

 

temperature by microcomputer.

 

(Thermistor/TH4: Refer to 10-6.)

compressor starting process and for 10

circuit board

 

 

(5104)

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

minutes after and during defrosting.)

 

 

 

 

 

 

 

 

 

 

 

10.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3 Replace outdoor controller board.

 

 

 

 

 

Open/short of outdoor unit thermistors

1 Disconnection or contact failure

1 Check connection of connector (TH3,TH6/TH7)

 

(TH3, TH6, TH7, and TH8)

of connectors

 

)

on the outdoor controller circuit board.

 

Abnormal if open or short is detected

Outdoor controller circuit

 

Check connection of connector (CN3) on the

 

during compressor operation.

board: TH3,TH6/TH7

 

outdoor power circuit board.

 

Open detection of thermistors TH3 and

Outdoor power circuit board:

Check breaking of the lead wire for thermistor

 

TH6 is inoperative for 10 seconds to 10

(CN3

 

(TH3,TH6,TH7,TH8). Refer to 10-9.

 

minutes after compressor starting and 10

2 Defective thermistor

 

 

2 Check resistance value of thermistor

 

minutes after and during defrosting.

3 Defective outdoor controller

 

(TH3,TH6,TH7,TH8) or check temperature by

 

WCheck which unit has abnormality in its

circuit board

 

 

microcomputer.

 

 

 

 

thermistor by switching the mode of

 

 

 

(Thermistor / TH3, TH6, TH7, TH8 : Refer to 10-6.)

U4

 

SW2. (PAC-SK52ST)

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

 

(Refer to 10-10.)

 

 

 

 

10.)

 

 

 

(TH3:5105)

 

 

 

 

 

 

 

 

 

 

 

 

 

3 Replace outdoor controller circuit board.

 

 

 

 

 

 

 

(TH6:5107)

 

 

 

 

 

 

 

WEmergency operation is available in case of

(TH7:5106)

 

 

 

 

 

 

 

abnormalities of TH3, TH6 and TH7.

(TH8:5110)

 

 

 

 

 

 

 

Refer to 10-8.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thermistors

 

 

Open detection

 

Short detection

 

 

 

Symbol

 

Name

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TH3

 

Thermistor <Outdoor pipe>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH6

 

Thermistor <Outdoor 2-phase pipe>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH7

 

Thermistor <Outdoor>

– 40:[-40˚F] or below

 

90:[194˚F] or above

 

 

 

TH8

 

Thermistor <Heatsink>

– 27:[-17˚F] or below

 

102:[216˚F] or above

 

 

 

 

 

 

 

 

Temperature of heatsink

1 The outdoor fan motor is

 

 

12 Check outdoor fan.

 

Abnormal if heat sink thermistor(TH8)

locked.

 

 

 

 

 

 

 

detects temperature indicated below.

2 Failure of outdoor fan motor

 

3 Check airflow path for cooling.

 

A12, 18, 42N··············84:, 183˚F

3 Air flow path is clogged.

 

 

 

A24, 30, 36N··············81:, 177˚F

4 Rise of ambient temperature

 

4 Check if there is something which causes

 

 

 

 

 

5 Defective thermistor

 

 

temperature rise around outdoor unit.

 

 

 

 

 

6 Defective input circuit of

 

 

(Upper limit of ambient temperature is 46:

 

 

 

 

 

outdoor power circuit board

 

[114˚F].)

 

 

 

 

 

 

 

7 Failure of outdoor fan drive

 

Turn off power, and on again to check if U5

 

 

 

 

 

 

is displayed within 30 minutes.

U5

 

 

 

 

circuit

 

 

 

 

 

 

 

 

If U4 is displayed instead of U5, follow the

(4230)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

action to be taken for U4.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5 Check resistance value of thermistor (TH8)

 

 

 

 

 

 

 

 

or temperature by microcomputer.

 

 

 

 

 

 

 

 

(Thermistor/TH8: Refer to 10-6.)

 

 

 

 

 

 

 

 

(SW2 on A-Control Service Tool: Refer to 10-

 

 

 

 

 

 

 

 

10.)

 

 

 

 

 

 

 

 

 

 

 

6 Replace outdoor power circuit board.

 

 

 

 

 

 

 

 

7 Replace outdoor controller circuit board.

 

 

 

 

 

 

Power module

 

1 Outdoor stop valve is closed.

1 Open stop valve.

 

Check abnormality by driving power module

2 Decrease of power supply voltage

2 Check facility of power supply.

 

in case overcurrent is detected.

3 Looseness, disconnection or

 

3 Correct the wiring (U·V·W phase) to

U6

(UF or UP error condition)

converse of compressor wiring

compressor. Refer to 10-9 (Outdoor power

(4250)

 

 

 

 

connection

 

 

circuit board).

 

 

 

 

 

 

 

4 Defective compressor

 

 

4 Check compressor referring to 10-6.

5Defective outdoor power circuit 5 Replace outdoor power circuit board. board

38

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Image 38
Mitsubishi Electronics PUY-A18NHA2 Case Judgment and action Open/short circuit of discharge, Temperature thermistor TH4
Page 37 Page 39

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