E7: Discharge Sensor Malfunction - Midea Mini VRF Technical & Service Manual

MCAC-VTSM-2016-02

4.7 E7: Discharge Sensor Malfunction

System faulty that T3 pipe temperature exceeds 27
degrees for more than 5 minutes under heating mode.
Whether the outdoor ambient temperature is higher than
the unit's operating condition under heating mode.
Check whether the refrigerant volume of the system is
added according to the requirement and check if the
refrigerant leaks.
Check whether the condenser is
blocked?
Check whether the resistance of condenser
4.8 Eb malfunction
Eb will display if E6 faulty happens twice in 10 minutes continuously.
Troubleshooting
LED displays E7/EA
NO
NO
NO
temperature sensor is correct.
NO
Replace main PCB
R410A All DC Inverter Mini VRF
YES
Connect the pipe again,
check leakage, insure the
YES
YES
Rectify the pipe system.
YES
Replace temperature sensor
Belongs to system
normal protection
pressure & add the
refrigerant.
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