[ IX Troubleshooting ]
- 170 -
HWE1018A GB
In the case of MA remote controller
3. Phenomena
"HO" stays lit on the remote controller display, and the buttons do not work. (Normally, "HO" goes off approximately after 5
minutes of power on.)
(1) Cause
1) The power for the M-NET transmission line is not supplied from the outdoor unit.
2) Short-circuited transmission line
3) Incorrect wiring of the M-NET transmission line on the outdoor unit.
Disconnected wire for the MA remote controller or disconnected line to the terminal block.
The indoor transmission line is connected incorrectly to the transmission terminal block for centralized controller (TB7).
The male power supply connectors on the multiple outdoor units are connected to the female power supply switch connector
(CN40).
In the system to which the power supply unit for transmission lines is connected, the male power supply connector is connect-
ed to the female power supply switch connector (CN40) on the outdoor unit
4) Disconnected M-NET transmission line on the indoor unit.
5) Disconnected wire between the terminal block for M-NET line (TB5) of the indoor unit and the indoor unit board (CN2M) or
disconnected connector.
6) Incorrect wiring for the MA remote controller
Short-circuited wire for the MA remote controller
Disconnected wire for the MA remote controller (No.2) and disconnected line to the terminal block.
Reversed daisy-chain connection between groups
Incorrect wiring for the MA remote controller to the terminal block for transmission line connection (TB5) on the indoor unit
The M-NET transmission line is connected incorrectly to the terminal block (TB13) for the MA remote controller.
7) The sub/main setting of the MA remote controller is set to sub.
8) 2 or more main MA remote controllers are connected.
9) Indoor unit board failure (MA remote controller communication circuit)
10) Remote controller failure
11) Outdoor unit failure (Refer to IX [7] Troubleshooting Using the Outdoor Unit LED Error Display.)(page 203)
12) The outdoor unit address is set to an address other than "indoor unit address plus 50."
13) The indoor unit address is set to a number 51 or highe
(2) Check method and remedy
1) When 2) and 3) above apply, check code 7102 will be displayed on the self-diagnosis LED.
YES
YES
YES
NO
YES
YES
NO
NO
Check the self-diagnosis LED
Error found?
Error found?
Replace the M-NET remote
controller with the MA
remote controller
Check for 5), 6), 12) and 13).
17 - 30V?
Same symptom for all units in a
system with one outdoor unit?
Check (1).
Check
2) and 3).
Check 4).
Correct
the error.
Correct
the error.
Measure voltages of the
terminal block for transmission
line (TB5) on the indoor unit.
Refer to [4] - 7 - (2) "Troubleshooting transmission power
circuit of outdoor unit" for the check method.(page 199)
Is the error code 7102
displayed?
Indoor unit board or
MA remote controller failure
NO
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