Occur generally. Remedy

Maintenance Service and Trouble Shooting

avometer. If short circuit occurs or the resistance of a certain phase is low, this means that short circuit does exist in the windings and/or between turns, and insulation layers have been burned or deteriorated. A megameter can be used in this inspection, too. I f the insulation resistance is lower than 2 MΩ, this means that the insulation layer is already breakdown. If the motor has been burned, repair it or replaced it with a new one.

b)Fault of control relay Analysis of Trouble

Overheat, burnout or wear of control relay contacts may occur generally.

All these will cause poor contact in electricity.

Remedy

Dismantle it to repair, or replace it with a new one.

c)Poor electric contactor in thermostat Analysis of Trouble

Burnout of contactor and leakage of temperature sensing agent may

Replace the old with a new one.

d)Check the terminals for loose connection and electric circuits for other abnormal phenomena.

5) Mechanical faults of compressor

a)Seizing of shaft

This phenomenon is caused mostly by poor lubrication, such ad insufficient quantity of lubricant, clogging in the lubricant oil line, or intermittent lubricant oil supply. Dirt and other impurities in the lubricant oil will increase its viscosity and cause the shaft to be seized. Copper plating may also result in seizing of shaft.

b)Seizing of piston

This is caused by too small fit clearance between the piston and cylinder or expansion due to heat.

Judgement of seizing shaft and piston: After the refrigerator has been powered on, the compressor will not start and run, but a slight hum sound can be heard, and several seconds later, thermal protective relay will actuate and make the contacts open; this process will occur repeatedly, but the compressor cannot be started.

E. Compressor won’t stop

Sometimes, the compressor will run continuously(for several hours or run without end), If the food placed in the refrigerator is not too much, there may be the following two situations: i) the refrigerator very low, this means that the control system is probably out of order; ii) the control system works normally, and there are troubles in the refrigerating system or other parts.

1) Temperature is set improperly

a)The temperature control knob is set to the “coldest” position. This

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