Midea MGA-D10/N1 Manual page 42

MCAC-UTSM-2008-11
P3: Discharge air temperature protection
Refer to the E9 to solve the problem
P4: Inlet–outlet water temperature difference protection
Judge 1: Check whether inlet–outlet water
temperature-sensitive kits gets faulty.
Judge 2: Check whether the sequence of the four
temperature-sensitive kits in the water pump is wrong
connected.
Judge 3: Check whether the water flow is too small
(Q<0.6×Q ).
rated
P5: Condenser high temperature protection
Judge 1: Check whether outdoor ambient
temperature is too high. compressor motor gets
Judge 2: Check whether the outdoor unit's ventilation
Judge 3: Check whether the outdoor condenser coil
Outdoor Unit
LED indicates P4
No
No
faulty.
No
is bad.
No
pipe gets dirty.
Yes
Replace the temperature-sensitive kits
Yes
Yes
Adjust the water flow
Yes
Add sunshade facilities.
Yes
Check if there are sundries blocking the
ventilation and clear them to make good
Yes
Clean the condenser.
Troubleshooting
Fix it well
ventilation
41