Midea MPM1-10CEN1-BB6 Technical & Service Manual page 19

8.4.4 Water full protection.
There are four switches on the base-pan water tank. S1, S2, S3, S4.
As you see the below graph.
If the water level exceed WL1, S1 activity, the Pump 1 that in charge of shower system start to
work. The fan motor maintains the origin state. After 1 hour, if the water level still exceed WL1,
but not exceed WL2. The outer fan motor will turn to low fan. If the water level drop below the
WL1, the pump 1 will have 2 minutes delay to shut down.
If the water level continues rise and reaching WL2, S2 activity, the outer fan turn to the low fan,
after 20 minutes later, the pump 2 that in charge of drain water out start to work, drain the
water to the auxiliary tank. If the water level drops below WL1, the pump 2 stop and the outer
fan motor maintain the low fan.
At the above 2 steps, if the unit turn from cooling mode to heating and dry mode, the pump 1
and pump 2 stop immediately.
Auxiliary tank
Base pan
If the water level meets to the WL4, S4 activity, the display will show the P1 protect. All of the
loads will into the status of sleep, the unit will back to the origin setting mode unless the water
level drops down. The TURBO button is available at P1 protection.
If the water level meets to the WL3, S3 activity, the display will show the P2 protect, at this
status, the unit will shut-down. After re-power and drain out water by base-pan drainage hose,
the unit could be back to the origin status.
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WL3
WL4
WL2
WL1
Electronic function