Mitsubishi P240 User Manual

[ 

IX  Troubleshooting ]

- 230 -

HWE09120

GB

"HO" display on the remote controller does not disappear, and no operation is performed even if the button is pressed.

Without using MELANS
1)   Outdoor unit address is set to "00"
2)   A wrong address is set.

ŒThe address of the indoor unit that is connected to the remote controller is incorrect. (It should equal the ME remote controller 

address plus 100.)

ŒA wrong address is set to the ME remote controller. (100 must be added to the address of the indoor unit.)

3)   Faulty wiring of the terminal block for transmission line (TB5) of the indoor unit in the same group with the remote controller.
4)   The centralized control switch (SW2-1) on the outdoor unit is set to ON.
5)   Disconnection or faulty wiring of indoor unit transmission line.
6)   Disconnection between the terminal block for M-NET line connection (TB5) of the indoor unit and the male connector (CN2M)
7)   The male power supply connectors on 2 or more outdoor units are connected to the female power supply switch connector 

(CN40) for the transmission line for centralized control.

8)   Outdoor unit control board failure
9)   Outdoor unit control board failure
10)  Remote controller failure

Interlocking control with MELANS
1)   No group registration is made using MELANS. (The indoor unit and the ME remote controller are not grouped.)
2)   Disconnected transmission line for centralized control (TB7) of the outdoor unit
3)   The male power supply connector is connected to CN40 on more than one outdoor unit, or the connector is connected to CN40 

on the outdoor unit in the system to which a power supply unit for transmission line is connected.

Using MELANS
1)    When MELANS is used, "HO" display on the remote controller will disappear when the indoor unit and the local remote con-

troller (ME remote controller) are grouped.
If "HO" does not disappear after the registration, check the causes (2) 1) - 3).

YES 

YES 

YES 

YES 

YES 

YES 

YES 

NO 

NO 

*1 

*1. When the indoor unit address is set to 1 - 50, the address will be forcibly set to 100. 

NO 

NO 

NO 

NO 

NO 

Without using MELANS 

Are all the units in the system  
experiencing the same problem? 

Check the address of 
 the outdoor unit. 

51 - 100? 

Check the centralized centralized 
switch (SW2-1) on the outdoor unit. 

ON? 

Indoor unit control board failure 

A wrong address is  
set to the outdoor unit. 

Wrong switch setting  
Change it from  
ON to OFF. 

A wrong address is 
set to the ME 
remote controller.

A wrong address is  
set to the indoor unit. 

Wrong wiring of the  
M-NET transmission  
line of the indoor unit 

Disconnected  
connector (CN2M) 

Correct  
the error. 

Disconnected? 

17 - 30V? 

ME remote controller

- 100?

Check the address of the  
indoor unit to be coupled. 

Indoor unit + 100? 

Check the address of the ME remote controller 
on which "HO" is displayed.

Check connection between indoor M-NET  
transmission terminal block (TB5) and the  
male connector (CN2M) 

Measure voltages of the terminal  
block for M-NET transmission line  
on the indoor unit. 

Indoor unit board or  
remote controller failure