Midea VRF V4 Plus I Series User Manual

R410A DC Inverter V4 Plus 50Hz MCAC-VTSM-2014-04
100 Troubleshooting
5.5 H0/H1
H0: IR341 and MC9S08AC128 communication error (Display on faulty unit, all the ODU in standby)
H1: 0537 and MC9S08AC128 communication error (Display on faulty unit, all the ODU in standby)
IR341 chip: IR 341chip is used for inverter compressor drive.
0537 chip: 0537chip is used for control the communication between indoor unit and outdoor unit, and the
communication between outdoors
MC9S08AC128 chip: MC9S08AC128 chip is the main chip, it used for the whole system control.
Note:
1. How to check whether power supply for 16(CN35), 17(CN37) and 21(CN29) terminals are abnormal
①
The voltage input for 16(CN35) and 17(CN37) terminals are both 220V, the voltage input between “GND” and “+5V” terminals
of 21(CN29) port is 5V, and between “GND” and “+12V” terminals of 21(CN29) port is 12V.
2. How to check whether the transformer on Main board is disabled
②
The voltage input for 10(CN31) and 11(CN33) terminals are both 220V, the voltage output of 25(CN32) terminal is AC9V
(yellow-yellow) and AC13.5V (brown-brown); the voltage output of 26(CN34) terminal is AC14.5V (yellow-yellow) and AC
14.5V (blue-blue). If the voltage is out of the range, the transformer is disabled.
H0/H1
Power supply for 16(CN35), 17(CN37)
and 21(CN29) terminals are abnormal
①
The transformer on main board is
disabled
②
Remove the interference
MC9S08AC128 chip is disabled
Main board is disabled
Replace main board
No
Yes
No
No
No
Yes
There has electromagnetic interference
nearby the unit. Such as High-frequency
transmitter or other high strength radiation
device
Replace the transformer
Provide normal power supply
Yes
Yes
CN26: Power output for No.2
transformer
CN25
：
Power output for No.1
transformer

Midea VRF V4 Plus I Series Specifications

General

Brand	Midea
Model	VRF V4 Plus I Series
Category	Air Conditioner
Language	English