Friedrich PTAC - R410A service manual Keep the air tightness well. Try not to use the electic

A/C on. No cooling (or heating)

Refrigerant is insuffi cient or leaking

Refrigeration system is blocked

Too much refrigerant

The effi ciency of the compressor is low

Condenser can’t discharge smoothly

At the time of heating, the electric heater

can’t run

Outdoor temperature is too high

Check leakage, carry out vacuum-pumping after repairing leakage and charge refrigerant according to requirements

Check whether the system is blocked by observing the condensation of the evaporator and the pressure value of the high pressure manometer, and then take measures to deal with the system.

Release the redundant refrigerant in system

Replace the compressor

Get rid of the obstacle

1.the wire is loosened; 2. thermal fuse is broken;

3.temperature limiter is damaged; 4. electric heater is damaged; 5. controller is broken. correct the wore correctly or replace those parts which has malfunction.

You can install the rain-proof and sun-proof board. If the

cooling air is still insuffi cient, you are suggested

to replace the A/C

Whether the cooling (heating) load is suitable
	Check the preset cooling (heating) load
The air tightness in room is not good. People
	Keep the air tightness well. Try not to use the electic
come in and go out frequently. There are
	appliances with a large quantity of heat
heating devices in the room when A/C is cooling

Call for fan

motor but fan motor will not come on

Supply voltage is unstable

Wrong wire connection

The fan’s capacitor is broken

The motor winding is of broken circuit or short circuit or the built in temperature limiter device in open circuit due to overheat.

The controller has malfunction

The compressor capacitor is broken; wrong wire

connection

Check the reason and correct it.

Check the circuit and connect the wire correctly

according to the electic circuit diagram

Replace fan’s capacitor with the same

mode and specifi cation

Replace those parts which has malfunction

Replace the controller

Replace capacitor; connect the wire correctly

according to the electric circuit diagram

Compressor isn’t running (controller is with output)

The compressor’s motor is burned out

The compressor is jammed or blocked

Check with a multimeter if the enclosed motor windings of compressor is with short or broken circuit or earthing. If so, it is needed to replace it with the same type and specifi cations.

Knock the compressor housing with a rubber bar or with a hammer padding with a wood, the compressor might be shocked and run. If not, change the compressor.

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