Daikin R410A Technical Manual page 38

Diagnostic Guidelines
By means of pressure reading :
Data
Circuit
High side
Low side
High side
●
Low side
High side ●
Low side ●
High side
Low side
High side
Low side
Pressure
● 1. Overcharged with refrigerant.
● 2. Non-condensable gases in refrigerant circuit (e.g. air)
3. Obstructed air-intake / discharge.
4. Hot air short circuiting in outdoor unit.
1. Poor compression / no compression (compressor
● defective)
2. Reversing valve leaking.
1. Undercharged with refrigerant.
2. Refrigerant leakage.
3. Air filter clogged / dirty (indoor unit).
4. Indoor fan locked / seized.
● 1. Outdoor fan blocked (cooling).
● 2. Outdoor coil dirty (cooling).
3. Non-condensable gases in refrigerant circuit (e.g. air)
● 1. Air intake temperature of indoor unit too high.
●
Probable cause
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