A.1/4~1/2

B.>1

C.1/3~1

D.0~14

A.Electric heater

B.Air filter

C.Humidifier

D.Differential pressure sensor

A.16

B.64

C.8

D.32

A.False

B.True

A.Remove and clean the water supply valve.

B.Disconnect the cables of the water supply valve and the water drain valve.

C.Replace the hose that has become rigid and fragile and thoroughly clean

D.Remove the components of the water drain trough and valve