MCAC-VTSM-2016-02 R410A All DC Inverter Mini VRF
Troubleshooting 69
4.7 E7: Discharge Sensor Malfunction
4.8 Eb malfunction
Eb will display if E6 faulty happens twice in 10 minutes continuously.
LED displays E7/EA
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.
YES
Belongs to system
normal protection
NO
Check whether the refrigerant volume of the system is
added according to the requirement and check if the
refrigerant leaks.
YES
Connect the pipe again,
check leakage, insure the
pressure & add the
refrigerant.
NO
Check whether the condenser is
blocked?
YES
Rectify the pipe system.
Replace main PCB
NO
Check whether the resistance of condenser
temperature sensor is correct.
Replace temperature sensor
NO
YES
