Midea MGA-D10/N1 Manual page 44

MCAC-UTSM-2008-11
Pb: System anti-frozen protection
Judge 1: Check whether the circulation water is
Judge 2: Check whether the plate heat exchanger
temperature sensor is abnormal
Judge 4: Check whether the ambient temperature is
too low (in cooling mode).
P8: Inlet temperature protection (three times in one hour and system should be powered on again) At this
time, the wired controller displays P4
-----Refer to the P4 to solve the problem
Outdoor Unit
LED indicates Pb
insufficient:
(Q<0.6×Q ).
rated
No
No
Yes
Check the water system and make
Yes
Replace the temperature sensor.
Adjust outdoor fan and increase the outdoor
Yes
Troubleshooting
adjustment.
air flow.
43