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Ho" Does Not Go Off The Screen - Mitsubishi Electric PURY-HP72 Service Handbook

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[8-2 ME remote Controller Problems ]
8-2-3

"HO" Does Not Go Off the Screen.

1. Phenomena
"HO" display on the remote controller does not disappear, and no operation is performed even if the button is pressed.
2. Cause
Without using MELANS
1) Outdoor unit address is set to "00"
2) A wrong address is set.
The address of the indoor unit that is connected to the remote controller is incorrect. (It should equal the ME remote controller
address plus 100.)
A 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 (SW5-1) 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) Indoor 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 items 1) through 3) in the "Cause" column of the section on interlocked
control with MELANS.
3. Check method and remedy
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 (SW5-1) on the outdoor unit.
ON?
Indoor unit control board failure
*1. When the indoor unit address is set to 1 - 50, the address will be forcibly set to 100.
HWE13080
NO
YES
*1
NO
A wrong address is
set to the outdoor unit.
YES
YES
Wrong switch setting
Change it from
ON to OFF.
NO
Correct
the error.
- 257 -
Check the address of the ME remote controller
on which "HO" is displayed.
NO
A wrong address is
Indoor unit + 100?
set to the ME
remote controller.
YES
Check the address of the
indoor unit to be coupled.
NO
ME remote controller
A wrong address is
- 100?
set to the indoor unit.
YES
Measure voltages of the terminal
block for M-NET transmission line
on the indoor unit.
Wrong wiring of the
NO
M-NET transmission
17 - 30V?
line of the indoor unit
YES
Check connection between indoor M-NET
transmission terminal block (TB5) and the
male connector (CN2M)
YES
Disconnected
Disconnected?
connector (CN2M)
NO
Indoor unit board or
remote controller failure
GB

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