Midea MGC-F14W/SN1 - Troubleshooting: Water Flow Error Er20

Specification MCAC-TSM-2008-02
60 Installation
9. Error code Er20:
Values display indication Er20
Refer to the instruction manual: Water flow protection.
Judge 1: Check whether the differential
pressure switch is close.
Close the differential
pressure switch
No
Yes
Judge 2: Check whether the pump is
setting high.
No
Setting the pump in high.
Yes
Judge 3: Check whether the air is in
water circuit,
Vent the air
Judge 4: Check whether the filter is
air-logged.
Clean the impurity.
Yes
No
Yes
Judge 5: Check whether the plate heat
exchanger is air-logged.
No
Clean the impurity.
Yes
Judge 6: PCB is malfunction
No
Replace PCB