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[7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ]
7-9-3
Error Code [7102]
1. Error code definition
Wrong number of connected units
2. Error definition and error detection method
The number of connected indoor units is "0" or exceeds the allowable value.
3. Error source, cause, check method and remedy
Error source
Outdoor unit
(1)
Number of indoor units connected to the outdoor
terminal block (TB3) for indoor/ outdoor transmis-
sion lines exceeds limitations described below.
Number of units
Total number of indoor units
Number of BC controllers
Number of
Main BC controllers
Number of Sub BC controllers
Total number of LOSSNAY
units (During auto address
start-up only)
Total number of outdoor units
(2)
Disconnected transmission line from the outdoor
unit or BC controller
(3)
Short-circuited transmission line
When (2) and (3) apply, the following display will
appear.
(4)
The model selection switch (SW5-7) on the out-
door unit is set to OFF. (Normally set to ON)
(5)
Outdoor unit address setting error
The outdoor units in the same refrigerant circuit do
not have sequential address numbers.
(6)
GA- or HA-type BC controller is connected as a
main BC controller to a system HP192 or above.
HWE13080
Cause
Restriction on the number of units
1 - 18 : HP72 model
1 - 24 : HP96 model
1 - 36 : HP144 model
1 - 48 : HP192 model
(HP72- HP144 models only)
0 or 1
0,1 or 2
0 or 1
1 : HP72 - HP96 models
2 : HP144 - HP192 models
ME remote controller
Nothing appears on the remote controller be-
cause it is not powered.
MA remote controller
"HO" or "PLEASE WAIT" blinks.
Check method and remedy
1)
Check whether the number of units con-
nected to the outdoor terminal block
(TB3) for indoor/ outdoor transmission
lines does not exceed the limitation. (See
(1) and (2) on the left.)
2)
Check (2) - (3) on the left.
3)
Check whether the transmission line for
the terminal block for centralized control
(TB7) is not connected to the terminal
block for the indoor/outdoor transmission
line (TB3).
1
4)
Check the setting for the model selection
switch on the outdoor unit (Dipswitches
SW5-7 on the outdoor unit control board).
- 241 -
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