R410A DC Inverter VRF V4 Plus W Series 50Hz
MCAC-VTSM-2016-04
204 Troubleshooting
3.3 E8: Main unit address error
3.4 E9: Voltage error
Note:
1. How to check whether the compressor is short circuit
①
:
The normal resistance value of inverter compressor among U V W is 0.7~1.5
Ω, and infinity to earth. If the resistance value is out
of the range, the compressor is abnormal.
2. How to check whether the fan motor is short circuit
②
:
The normal value of DC fan motor coil among U V W is less than 10
Ω, and the value of AC fan motor coil is from a few ohm to
hundreds of ohm for different fan motor model. If the measured value is 0
Ω, the fan motor is short circuit.
3. How to check whether the inverter module is output error
③
:
Dial the multimeter to diode file, black pen on P and red pen respectively on U,V,W, if the multimeter displays 0.4~0.7 V, it is
normal; Red pen on N, black pen respectively on U,V,W, if the multimeter displays 0.4~0.7 V, it is normal. Satisfying the above
two conditions at the same time indicates that the inverter module has no problem.
E8: Main unit address error
The ODU's address is more than 3 or
be set repeatedly
The addresses should be set less
than 3 and differently
Outdoor main PCB is
damaged
Replace the outdoor
main PCB
No
Yes
The communication wires H1, H2 and
E are short circuit or disconnected. If
the resistance between H1, H2andE is
zero or very small, the reason is short
circuit; If using the multimeter testing
the communication wires don
’t have
belling
sound,
the
reason
is
disconnected.
Replace
or
reconnect
the
communication wires
Yes
No
Yes
E5: Voltage error
Voltage of power supply is too high or
too low (the normal voltage between A
and N (B and N, C and N) should be
198V~242V)
Provide normal power supply
Check the high voltage circuit. Whether
the compressor is short circuit
①
, fan
motor is short circuit
②
, inverter module
is output error
③
, etc.
Replace the inverter module
or repair related parts
No
No
Yes
Yes
Outdoor main PCB
is damaged
Replace the outdoor
main PCB