Midea MIV V4+ Mini Service Manual page 31

DM12-01.01.05en
③ Mode-confliction malfunction
In the below table, "Yes" indicates existing mode conflict, "No" indicates no mode conflict.
Cooling
Heating
Air-supply
OFF
When indoor unit receiving heating operation instruction, it will transmit the operation mode signal to outdoor
unit to conduct prior heating control, including:
In process of cooling and air-supply mode operation: After receiving the heating operation instruction,
outdoor unit stops cooling and supplying air, and transfers to heating mode three minutes later after the
shutdown of compressor; indoor unit required to conduct cooling and air-supply mode operation is on standby
mode and displays mode conflict fault.
In process of heating mode operation: Ignore cooling and air-supply mode operation instruction, outdoor
unit keeps on operating according to heating mode; Indoor unit with cooling and air-supply mode operation
displays mode conflict fault. If heating mode operation stops (except that indoor unit reaches setting
temperature because of heating), cooling and air-supply mode restarts up and conducts operation three
minutes later.
④
Water-level switch malfunction
Water-level switch malfunction
Water-level switch connecting wire
between switch and main board gets
loose
There is something wrong with the
water-level switch
Chip fault, or chip foot sheds off, or chip is inverted
(correct mode is semicircular bent alignment)
Mainboard error:
For example, getting
wet
Outdoor units
Cooling
No
Yes
No
No
Exist
OK
Exist
OK
OK
MIV V4+ Mini DC Inverter R410A (220V, 8 kW)
Heating
Yes
No
Yes
No
Reconnect and ensure that the
connection is reliable.
Replace switch
Error
Reinstall chip, or install other chip with
same model on the faulty unit, to check
whether there is something wrong with chip.
Replace
mainboard
Air-supply OFF
No No
Yes No
No No
No No
OK
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