NET communication error, Processor | Mitsubishi Electronics PUZ-A36NHA2-BS

Error Code

Abnormal point and detection method

Case

Judgment and action

Pipe temperature

1 Slight temperature difference

1~4 Check pipe <liquid or condenser /

between indoor room

evaporator> temperature with room

Detected as abnormal when the pipe tem-

temperature and pipe <liquid

temperature display on remote

perature is not in the cooling range 3 min-

or condenser / evaporator>

controller and outdoor controller circuit

utes after compressor start and 6 minutes

temperature thermistor

board.

after the liquid or condenser/evaporator pipe

• Shortage of refrigerant

Pipe <liquid or condenser / evaporator>

is out of cooling range.

• Disconnected holder of pipe

temperature display is indicated by

Note 1) It takes at least 9 min. to detect.

<liquid or condenser /

setting SW2 of outdoor controller circuit

Note 2) Abnormality P8 is not detected in

evaporator> thermistor

board as follows.

)

drying mode.

• Defective refrigerant circuit

Conduct temperature check with outdoor

Cooling range : Indoor pipe temperature

2 Converse connection of

controller circuit board after connecting

(TH2 or TH5) – intake temperature

extension pipe (on plural units

(‘A-Control Service Tool(PAC-SK52ST)’.

(TH1) [ -3 deg [-5.4˚F]

connection)

TH: Lower temperature between liquid pipe

3 Converse wiring of indoor/

Temperature display of indoor liquid pipe

Temperature display of indoor condenser/

temperature and condenser/

outdoor unit connecting wire

Indoor 1

evaporator pipe

Indoor 1

evaporator temperature

(on plural units connection)

4 Defective detection of indoor

OFF

room temperature and pipe

Temperature display of indoor liquid pipe

Temperature display of indoor condenser/

When 10 seconds have passed after the

Indoor 2

evaporator pipe

Indoor 2

compressor starts operation and the hot

temperature thermistor

adjustment mode has finished, the unit is

5 Stop valve is not opened

detected as abnormal when

completely.

OFF

condenser/evaporator pipe temperature is

A-Control Service Tool SW2 setting

not in heating range within 20 minutes.

23Check converse connection of extension

Note 3) It takes at least 27 minutes to

pipe or converse wiring of indoor/outdoor

detect abnormality.

unit connecting wire.

Note 4) It excludes the period of defrosting

(Detection restarts when defrosting

mode is over)

Heating range : 3 deg [5.4˚F] [ (Condenser/

Evaporator temperature(TH5) –

intake temperature(TH1))

<M-NET communication error>

(Note) “Indoor unit” in the text indicates M-NET board in outdoor unit.

Error Code

Abnormal point and detection method

Case

Judgment and action

Address duplicate definition

1 There are 2 or more same

Search the unit with same address as abnormality

This error is displayed when transmission

address of controller of out-

occurred. If the same address is found, turn off the

from the units of same address is detect-

door unit, indoor unit, FRESH

power supply of outdoor unit and indoor unit and

ed.

MASTER, or LOSSNAY.

FRESH MASTER or LOSSNAY at the same time

(6600)

Note) The address and attribute displayed

2 Noise has entered into trans-

for 2 minutes or more after the address is correct-

at remote controller indicate the con-

mission signal and signal was

ed, and turn the power on again.

Check transmission waveform or noise on trans-

troller that detected abnormality.

transformed.

mission wire.

Hardware error of transmission

1 Error is detected if waveform is

1 If the works of transmission wire is done with

processor

transformed when wiring works of

the power on, turn off the power supply of

Transmission processor intended to trans-

transmission wire of outdoor unit,

outdoor unit and indoor unit and FRESH

mit “0”, but “1” appeared on transmission

indoor unit, FRESH MASTER or

MASTER or LOSSNAY at the same time for

wire.

LOSSNAY are done, or polarity is

2 minutes or more, and turn the power on

Note) The address and attribute display at

changed with the power on and

again.

(6602)

remote controller indicate the con-

transmission data collide each other.

2 Defective transmitting receiving

2 Check transmission waveform or noise on

troller that detected abnormality.

circuit of transmission processor

transmission wire.

3 Transmission data is changed by

the noise on transmission.

BUS BUSY

1 Transmission processor could

1 Check if transmission wire of indoor unit,

1. Overtime error by collision damage

not transmit signal because short

FRESH MASTER, LOSSNAY, or remote con-

Abnormal if transmitting signal is not

cycle voltage of noise and the

troller is not connected to terminal block for

possible for 8-10 minutes continuously

like have entered into transmis-

central control (TB7) of outdoor unit.

because of collision of transmission.

sion wire continuously.

2 Check if transmission wire of indoor unit,

2. Data could not reach transmission wire

2 Transmission quantity has

FRESH MASTER or LOSSNAY is not con-

for 8-10 minutes continuously because

increased and transmission is

nected to terminal block for transmission

of noise or etc.

not possible because there was

wire of outdoor unit.

wiring mistake of terminal block

Note) The address and attribute displayed

for transmission wire (TB3) and

at remote controller indicate the con-

(6603)

terminal block for central control

troller that detected abnormality.

(TB7) in outdoor unit.

3 Transmission are mixed with

3 Check if terminal block for transmission wire

others and occupation rate on

(TB3) and terminal block for central control

transmission wire rose because

(TB7) are not connected.

of defective repeater (a function

4 Check transmission waveform or noise on

to connector or disconnect trans-

transmission wire.

mission of control and central

control system) of outdoor unit,

then abnormality is detected.