1, The thermostat should not be set on too high position. Operating constantly on strong position will cause too low temperature in the fridge storage compartment and ice may be formed there.
2, Frost or ice bead formed sometimes and melt other times on the back board of the fridge storage compartment It is mainly because the air in the fridge storage compartment is of high humidity. When the refrigerator is operating, the surface of the evaporator on the inner wall of the fridge storage compartment is of very low temperature and some moisture will condense on the back board of it and then freeze or frost. When the refrigerator stops operating, the temperature in the compartment will rise, and the ice bead or frost will melt into water and flow out from the discharge outlet. So it is a normal phenomenon. In summer, as the air is of high temperature and humidity, this phenomenon may become more apparent.
3, The water discharge outlet is blocked
4, Ice formed on the back wall