128

 

 

Check code

 

 

 

 

 

 

 

 

 

 

Detected

Check code name

Status

Error detection condition

Check item (position)

Main

Outdoor 7-segment display

AI-NET

position

remote

 

 

central control

 

 

 

 

 

controller

Check code

Sub-code

remote controller

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H03

H03

01: Compressor 1 side

17

IPDU

Current detection

All stop

While header compressor

• Check cabling of current detection circuit system.

 

 

02: Compressor 2 side

 

 

circuit system error

 

stopped, current flowed more

• Check outdoor P.C. board (IPDU) error.

 

 

 

 

 

 

 

than the specified amount.

 

 

 

 

 

 

 

 

 

 

H04

H04

44

I/F

Compressor 1 case

All stop

Compressor 1 case thermostat

• Check compressor 1 case thermo circuit. (Connector, cable, P.C. board)

 

 

 

 

 

thermo operation

 

performed protective operation.

• Check full opening of service valve. (Gas and liquid side)

 

 

 

 

 

 

 

 

• Check outdoor PMV clogging. (PMV1, 2, 3)

 

 

 

 

 

 

 

 

• Check SV41 circuit leakage.

 

 

 

 

 

 

 

 

• Check miscabling/misinstallation of SV41 and SV42.

 

 

 

 

 

 

 

 

• Check valve open status of indoor PMV.

 

 

 

 

 

 

 

 

• Check 4-way valve error.

 

 

 

 

 

 

 

 

• Check refrigerant shortage.

 

 

 

 

 

 

 

 

• Check SV5 leak.

 

 

 

 

 

 

 

 

• Check SV11 circuit. (Wiring, OFF at one side only)

 

 

 

 

 

 

 

 

• Check mispiping of discharge gas/suction gas main pipe.

 

 

 

 

 

 

 

 

• Check Flow selector unit.

 

 

 

 

 

 

 

 

Check leakage of SVD valve and SVS valve.

 

 

 

 

 

 

 

 

(Check leakage of SVDD valve and SVSS.)

 

 

 

 

 

 

 

 

Check mispiping of FS unit connecting pipe (Suction gas/Discharge gas),

 

 

 

 

 

 

 

 

wiring between FS unit and indoor unit, and connection of connectors.

 

 

 

 

 

 

 

 

Check miswiring of SVS/SVD valves.

 

 

 

 

 

 

 

 

 

H06

H06

20

I/F

Low-pressure

All stop

Low-pressure Ps detected

• Check full opening of service valve.

 

 

 

 

 

protective operation

 

operation lower than 0.02MPa.

(Discharge gas, suction gas and liquid side)

 

 

 

 

 

 

 

 

• Check outdoor PMV clogging. (PMV1, 2)

 

 

 

 

 

 

 

 

• Check SV2 circuit and SV4 circuit error.

 

 

 

 

 

 

 

 

• Check low-pressure Ps sensor error.

 

 

 

 

 

 

 

 

• Check indoor air filter clogging.

 

 

 

 

 

 

 

 

• Check valve open of indoor PMV.

 

 

 

 

 

 

 

 

• Check refrigerant pipe clogging.

 

 

 

 

 

 

 

 

• Check outdoor fan operation.

 

 

 

 

 

 

 

 

(All heating, mainly heating, part cooling operation)

 

 

 

 

 

 

 

 

• Check refrigerant shortage.

 

 

 

 

 

 

 

 

• Check clogging of circuit at auxiliary heat exchanger side.

 

 

 

 

 

 

 

 

(PMV3, SV12, check valve)

 

 

 

 

 

 

 

 

• Check 4-way valve error. (Reversal error)

 

 

 

 

 

 

 

 

• Check mispiping of discharge gas/suction gas main pipe.

 

 

 

 

 

 

 

 

• Check Flow selector unit.

 

 

 

 

 

 

 

 

Check miswiring of discharge gas/suction gas pipe to FS unit.

 

 

 

 

 

 

 

 

Check wiring between FS unit and indoor unit.

 

 

 

 

 

 

 

 

Check miswiring of SVD/SVS valves, misinstallation of coil.

 

 

 

 

 

 

 

 

Check opened status of SVS valve.

 

 

 

 

 

 

 

 

 

Page 128
Image 128
Toshiba MMU-AP0091H service manual 128, Detected Check code name