Haier MRV 5 Series Troubleshooting Manual page 45

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Troubleshooting
Items
1. Check the wire connection between
high pressure switch and PCB
2. Check if the high pressure switch wire
is conductive
3. Check if the stop valve is open
4. Check if the EEV is open
5. In heating mode, check if the air duct
length is too long
6. Check if the condenser or evaporate
is dirty;
7. Check if outdoor or indoor fan motor
operates normally
8. Check if the ambient temperature
exceeds the working range.
9.Check the pressure at the stop valve
42

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