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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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Troubleshooting
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Do you have a question about the PURY-HP72 and is the answer not in the manual?
Questions and answers
what is the set up mode for recovery, and charging of sys?
Why can control my indoor unit with centralize control
You may not be able to control your Mitsubishi Electric PURY-HP72 indoor unit with centralized control for the following reasons:
1. The power jumper connector on the outdoor unit may not be correctly set. It should be connected to CN40 on only one outdoor unit.
2. The central control switch (SW5-1) on the control board of all outdoor units must be set to "ON."
3. Address settings may not be correctly configured. The main indoor unit should be assigned the smallest address (e.g., IC00), and correct port number settings are required.
4. If using a remote controller alone, an interlock setting from the remote controller is needed.
5. Both ME and MA remote controllers cannot be connected to the same indoor unit group.
6. System controller power issues may occur if the outdoor unit fan rotates due to external forces, causing the system controller to detect an error.
7. Improper wiring or incorrect voltage at TB7 may also prevent operation.
Check each of these conditions to ensure proper centralized control.
This answer is automatically generated
Why can’t control indoor unit with centralize control and stay the MA control set up can’t. Control the mode
The Mitsubishi Electric PURY-HP72 indoor unit cannot be controlled with centralized control and the mode control setup does not function due to the following reasons:
1. Central control is not possible if the indoor/outdoor transmission line is used, even if TB7 terminals are daisy-chained.
2. Shielded cables must be used, and the connection must only be made after confirming the voltage is below 20 VDC.
3. Improper connection of the transmission line for centralized control, such as not correctly daisy-chaining terminals M1 and M2 or not short-circuiting the earth and S terminals on TB7.
4. If a power supply unit is not connected to the centralized control line, the power jumper connector must be moved from CN41 to CN40 on one outdoor unit—if this is not done, mode control will not function.
5. Overlapped indoor unit addresses or noise interference on the remote controller lines can also prevent proper control.
6. Failure to set one MA remote controller to MAIN or exceeding its capacity can result in control failure.
All these factors must be correctly configured for centralized and mode control to function properly.
This answer is automatically generated