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Error Code [6602] - Mitsubishi Electric PURY-HP72 Service Handbook

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[7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ]
7-8-5

Error Code [6602]

1. Error code definition
Transmission processor hardware error
2. Error definition and error detection method
Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line.
The address/attribute appeared on the display on the remote controller indicates the controller where an error oc-
curred.
3. Cause
1) When the wiring work of or the polarity of either the indoor or outdoor transmission line is performed or is changed while the
power is on, the transmitted data will collide, the wave shape will be changed, and an error will be detected.
2) Grounding fault of the transmission line
3) When grouping the indoor units that are connected to different outdoor units, the male power supply connectors on the multiple
outdoor units are connected to the female power supply switch connector (CN40).
4) When the power supply unit for transmission lines is used in the system connected with MELANS, the male power supply
connector is connected to the female power supply switch connector (CN40) on the outdoor unit.
5) Controller failure of the source of the error
6) When the transmission data is changed due to the noise on the transmission line
7) Voltage is not applied on the transmission line for centralized control (in case of grouped indoor units connected to different
outdoor units or in case of the system connected with MELANS)
4. Check method and remedy
HWE13080
Is the transmission line work
performed while the power is on?
NO
Check the power source of the indoor unit.
NO
188 / 253V?
YES
Check the transmission line work is performed
and the shielded wire is treated properly.
Grounding fault or does the shielded
wire contact with the transmission line?
NO
System ?
Single-outdoor-unit system
Multiple-outdoor-unit system
Confirm that the power supply
connector on the outdoor
unit is not plugged into CN40.
Is the male power supply connector
YES
connected to the female power supply
switch connector (CN40) on only one
of the outdoor unit?
NO
Tightly reconnect the male power
supply connector to the female
power supply switch connector (CN40).
Investigation into the
*For the investigation method, follow
transmission line noise
<Investigation method of transmission wave shape/noise>
YES
Investigation into the
Noise exist?
cause of the noise
NO
Controller failure of the
source of the error
YES
Turn off the power source of outdoor/indoor
units, and turn them on again.
Faulty power source work
YES
Improper transmission line work
System with the power supply
unit for transmission lines
Confirm that the power supply
connector on the outdoor
unit is not plugged into CN40.
Is the male power supply connector
NO
connected to the female power supply
switch connector (CN40) ?
YES
Disconnect the male
power supply on
CN40 and connect it to CN41
Correct the error.
- 225 -
GB

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