ESIE16-02K
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Part 2. Troubleshooting
2.3. Symptom based troubleshooting
Page 46
31/05/21
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Version 1.1
RA R32 Split & multi split M-Series
2.3.6. Abnormal high pressure
In cooling mode
In heating mode
2.3.7. Abnormal low pressure
Abnormally low pressure level is mostly caused by the evaporator side. The following contents are provided based on field
checking of service engineer. Further, the number is listed in the order of degree of influence.
In cooling mode
Check the expansion valve.
If a passing sound is heard from the pressure reducing valve,
apply sound insulation sheets of putty to reduce the valve noise.
Check item
Detail
Does the outdoor unit fan run normally?
Visual inspection
Is the outdoor unit heat exchanger clogged?
Visual inspection
Is there clogging before or after the expansion valve (capillary)?
Check if there is a temperature difference before and after
expansion valve (capillary).
Check if the main valve unit of expansion valve operates (by
noise, vibration).
Is the High Pressure Switch normal?
Check continuity by using a tester.
Is the outdoor unit installed under such conditions that short cir-
cuit easily occurs?
Visual inspection
Is the piping length <5 m?
Visual inspection
Does air enter the refrigerant system?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Is the refrigerant overcharged?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Check item
Detail
Does the indoor unit fan run normally?
Visual inspection
Is the indoor unit heat exchanger clogged?
Visual inspection
Is the indoor unit installed under such conditions that short circuit
easily occurs?
Visual inspection
Is there clogging before or after the expansion valve (capillary)?
Check if there is a temperature difference before and after
expansion valve (capillary).
Check if the main valve unit of expansion valve operates (by
noise, vibration).
Is the High Presure Switch normal?
Check continuity by using a tester.
Is the minimum piping length respected?
Visual inspection
Does air enter the refrigerant system?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Is the refrigerant overcharged?
Conduct refrigerant collection and vacuum drying, and then add
proper amount refrigerant.
Check item
Detail
Does the indoor unit fan run normally?
Visual inspection
Is the indoor unit heat exchanger clogged?
Visual inspection
Is the indoor unit installed under such conditions that short circuit
easily occurs?
Visual inspection
Check
Detail