You trip when it's cold.

First, there are generally two main reasons for air conditioning tripping: thermal protection of the press or poor temperature resistance of the internal pipe. If the printing machine has stopped and the fan has not stopped, this is the thermal protection of the printing machine.

1. The fuse of air-conditioning special circuit is blown, or the power switch is in poor contact, or the power supply is out of phase. Many families only use one power supply, which will cause abnormal power supply because other electrical appliances are not working properly.

2. The power supply for air conditioning is too low. When the voltage is lower than 10% of the single-phase normal voltage of 220v, that is, 198v or less, it is difficult to start the refrigeration compressor in the air conditioner.

3. If the dial button on the thermostat is not set in a proper position, if it is set in a higher position, when the power is turned on, the temperature in the air-conditioning room has not reached the upper limit of the set temperature, and the compressor cannot be started.

4, high voltage relay action, such as condensation pressure is too high, make the high voltage relay action, stop the operation of the compressor.

5, low-voltage relay action, such as insufficient refrigerant in the refrigeration system, compressor suction pressure is too low, make the low-voltage relay action, stop the operation of the compressor.

6, compressor, fan motor current is too large, make the overload protection relay action and cut off the power supply.

Second, the air conditioning tripping solution

1, first check the cause of fuse blowing inside and outside the air conditioner, and take measures to prevent it from blowing again, and adjust the maintenance in time. It is suggested that families with air conditioning should set up special power supply to basically prevent air conditioning from tripping.

2. If the local power supply voltage is often in a low state, a reliable power supply should be used. At the same time, it is suggested that families with more household appliances use special power supply.

3. Turn the dial button on the thermostat to the required position, that is, adjust it according to the required temperature of the air-conditioned room.

4, check the reason of the condensation pressure is too high, and eliminate, make its condensation pressure back to normal pressure.

5, check the reason of insufficient refrigerant in the refrigeration system, and eliminate, make its suction pressure back to normal pressure.

6, check the compressor motor, fan motor overload reason, and eliminate. Heat pump assisted electric heating air conditioner uses both electric heating and heat pump assisted heating. The heating efficiency is high, and the power consumption is between heat pump type and electric heating type.

The disadvantage of heat pump cold and hot air conditioning is that the four-way electromagnetic reversing valve used in it fails, resulting in machine failure, and the four-way electromagnetic reversing valve of famous brand products has good working reliability.

Extended data:

Common current, voltage and phase sequence protection functions and troubleshooting of air conditioners;

First, the compressor current overload protection

When the voltage is normal and the system is stable, the working current of the air-conditioning compressor is 85% of the rated current. When any one of the voltage, wire and air conditioning systems fails, its working current will change. When the changing current exceeds the limited range, the electronic control system will forcibly stop or change the working state and display the fault.

The current detection circuit of the air conditioner senses the current generated by alternating current passing through the current transformer, and transmits the sensed sampled current value to the CPU, and the CPU calculates the actual current value through comparison to judge whether the current exceeds the limit.

Problems related to compressor overcurrent;

(1), power supply problem (too high or too low voltage, narrow power line diameter, insufficient switching ability);

(2), compressor overcurrent (compressor turn-to-turn short circuit, shaft locking, stuck, insufficient refrigeration oil);

(3) The external machine is heavily loaded (poor heat dissipation, blocked dirty surface of condenser, sun exposure, etc.). );

(4) The high-pressure side of the system is blocked or semi-blocked;

(5) Excessive refrigerant;

(6), the main control board current transformer short circuit or current detection circuit failure;

Second, phase sequence protection

Air conditioners using three-phase power supply are equipped with phase sequence protection and phase-missing protection to prevent the compressor from being damaged due to wrong phase sequence or phase-missing operation of power supply. The principle of phase sequence detection circuit is to detect the input power supply according to the characteristic that there is a phase difference of 120 between the phases of three-phase electricity. When the power supply is out of order or out of phase, it will stop and fail.

The related problems that lead to compressor phase sequence error and lack of phase protection are:

(1), whether the input power supply is normal;

(2) Whether the phase sequence fault-tolerant components are normal (phase sequence fault-tolerant board, AC contactor);

Third, the protection of too high or too low voltage.

The purpose of the voltage protection circuit is to monitor the input voltage of the commercial power in real time to prevent the components from being damaged due to the voltage exceeding the range.

The reasons for the high or low voltage alarm are:

(1), the mains supply input is beyond the normal operation range of the air conditioner (220v 20% for single-phase electricity and 380v 20% for three-phase electricity);

(2), outdoor main control board voltage detection circuit failure: