Midea MGA-D10/N1

R410A Mini Split Chiller 50Hz MCAC-ATSM-2014-01
48
P3: Discharge temperature protection
Refer to the E9 to solve the problem
P4: Inlet–outlet water temperature difference protection
P5: Condenser high temperature protection
LED indicates P4
Check whether inlet–outlet water temperature-sensor
kits gets faulty.
Yes
Replace the temperature-sensor kits.
Check whether the sequence of the four
temperature-sensor kits in the water pump is wrong
connected.
No
Yes
Fix it well.
Check whether outdoor ambient temperature is too
high. Compressor motor gets faulty.
Add sunshade facilities.
Check if there are sundries blocking the
ventilation and clear them to make good
ventilation.
Clean the condenser.
Check whether the water flow is too small
(Q<0.6×Q
rated
).
No
Yes
Adjust the water flow.
No
Check whether the outdoor condenser coil pipe gets
dirty.
No
Yes
Yes
Yes
Check whether the outdoor unit’s ventilation is bad.