Midea MFJ-24ARN1-QB8, Техническое и сервисное руководство

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Exploded view & spare-part
21
9 Trouble shooting
9.1 Protective Function
9.1.1 3-minute delay for the compressor start-up
At the beginning of energizing or after the stop of the compressor, 3-minute delay will be needed
to start the compressor.
When switching over between cooling/heating mode, the compressor stops automatically.
9.1.2 Evaporator protection against high temperature
9.1.2.1 Only available under heating mode.
9.1.2.2 The operation principle is as follows: (T2 = evaporator temperature)
Condition Outdoor fan Compressor
T2>56°C Off On
T2>62°C Off Off
T2<62°C On Off
T2<50°C On On
Note: During protection, the indoor fan continues operating at a set speed, while the anti-cold air
function of heating and the compressor will be 3 minute delayed to shut down for protection.
9.1.3 Evaporator Protection against low temperature
9.1.3.1 Only available under cooling and dehumidifying status.
9.1.3.2 Protection principle:
Condition Outdoor fan Compressor
T2<2°C
（
last 3 minute
）
Off Off
T2>8°C On On
9.1.3.3 The restart of the compressor shall execute the delay protection.
9.1.4 Condenser high temperature protection
9.1.4.1 Only available to cooling and dehumidifying mode.
9.1.4.2 Action condition
Condition Outdoor fan Compressor
Condenser temp.>62°C Off Off
Condenser temp.<48°C On On
9.1.4.3 Delay protection should be performed when the compressor restarts.
9.1.5 Outdoor protection
When outdoor protection signal is high level, outdoor unit will perform protection: the whole
machine will be shut down while the indoor unit will indicate the corresponding protection signal.
The A/C will recover if outdoor errors are eliminated after the outdoor protection occurs.
9.2 Self-diagnosis
Codes Contents
P4 Protection of temperature of indoor evaporator
P5 Protection of temperature of outdoor condenser
P9 Protection of defrosting or anti-cold wind
E1 Open-circuit and short-circuit of temperature sensors T1
E2 Temp. sensor T2 on indoor evaporator is open circuit or short circuit