122
5.24
H5 Troubleshooting
Digital display output
Description
Abnormal power supply voltage.
All units stop running.
Error code is only displayed on main PCB and user interface.
Possible causes
Outdoor unit power supply voltage at or above 265V or drops below 170V or a phase is missing.
Loosened wiring within electric control box.
High voltage circuit error.
Main PCB damaged.
Procedure
For SCV-750EB and SCV-1400EB
H5
The grid power input voltage is too high
(>456V) or too low (<342V)
Yes
Provide normal power supply
No
Communication fault between the
compressor module board and the main
control board
Yes
Check the communication cable between
the compressor module board and the
main control board
No
High voltage circuit error has occurred,
such as the compressor has
malfunctioned
3
, the fan motor has
short-circuited
4
, or the inverter module has
short-circuited
5
Yes
Replace or repair the relevant parts
No
Replace compressor module board
Notes:
1.
The detected voltage is detected by the compressor module board and sent to the main control board, and the main control board judges according to the
voltage value sent by the compressor module board (report a fault if it is >456V or <342V).
2.
Refer to Part 4, 3 “Wiring diagram” and PCB components to make sure wire connection is firm.
3.
The normal resistances of the inverter compressor is 0.124Ω (at 20
℃
ambient temperature) among U V W and infinite between each of U V W and
ground. If any of the resistances differ from these specifications, the compressor has malfunctioned.
4.
The normal resistances of the fan motor coil among U V W are less than 15Ω. If a measured resistance is 0Ω, the fan motor has short-circuited.
5.
Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has
short-circuited. Refer to Part 4, 1 “Outdoor Unit Electric Control Box Layout”.
Summary of Contents for SCV-1400EB
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Page 46: ...44 1 Electric Control Box Layout For SCV 750EB For SCV 1400EB...
Page 61: ...59 3 Wiring diagram 3 1 Single unit For SCV 750EB and SCV 1400EB...
Page 62: ...60 For SCV 900EB...
Page 63: ...61 For SCV 1800EB...
Page 78: ...76 5 5 E3 E4 E5 E7 Eb Ed EE EF EP EU Fb Fd Troubleshooting Digital display output...
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