Repair heater

Readjust the heater

Replace heater and bimetal thermo

Reuse the heater and over load protector

Non condensable gases

Moisture and wax from oil

Solid particles

Over charging of refrigerant

Under charge of refrigerant

Over charge of refrigerant

Defective fan motor

Defective timer

Defective fan motor

Open door switch

High watt Cabinet bulb

Defective timer

No system pressure equalising

Inexpensive and has no moving parts

Expensive and more moving parts

Periodical servicing is required