What is the reason for the high pressure protection of Gree air conditioning compressor

1.Temperature-induced protection: (1) Insufficient refrigerant or expansion valve opening is too small, and the return air temperature is too high, resulting in the exhaust temperature exceeding the protection temperature, temperature protection (accompanied by low pressure).

2) The reflow temperature is too high. This leads to an increase in the temperature of the exhaust gases, resulting in temperature protection (accompanied by low pressure). (3) The high-temperature package of the expansion valve is too close to the compressor.

The temperature detected by the temperature sensor is larger than the actual temperature, causing the expansion valve to open too widely, the refrigerant to evaporate incompletely, and part of it enters the compressor in a liquid state, causing liquid hammer. (4) The working conditions of the condenser are relatively poor, the surface of the condenser is dirty (dust or oil) resulting in abnormal heat exchange, and the high ambient temperature of the condenser leads to abnormal heat exchange, resulting in an increase in condensation temperature, a decrease in condensation, and an increase in pressure from the exhaust to the condenser pipe section, resulting in high compressor discharge pressure and temperature (temperature protection). (5) The compressor lacks oil or the motor bearing is damaged, the motor heats up, and the heat cannot be dissipated in time, resulting in temperature protection.

6) Incorrect refrigerant charging type (different refrigerants, matching of oil, heat exchanger, expansion valve and refrigerant charging volume). 2.Pressure-induced protection:

1) Too much refrigerant. In the event of liquid hammer, the compressor compression is difficult, and the load exceeds the standard, resulting in high-pressure protection (the pressure does not necessarily rise during temperature protection, but the temperature rise must be accompanied by high-pressure protection, because the motor heats up). (2) The pipeline is dirty and blocked.

Such as filter blockage, capillary blockage, etc. , resulting in an increase in exhaust pressure, which provides high-pressure protection. (3) There is air in the pipes.

Compression is difficult, resulting in high pressure protection. (4) The low pressure is too low. Reason:

1) The refrigeration system has too little refrigerant, (2) the indoor heat exchanger or filter is blocked, (3) the opening of the electronic expansion valve is too small, (4) the fan speed of the evaporation part is low or stopped, (5) the refrigeration system is semi-blocked, dirty, ice or oil.

The external condenser is too cold and needs to work in reverse, that is, the external condenser is heated to increase the temperature of the condenser.

Solution: Determine if the ambient temperature is too low. First determine whether it is a control fault or a system fault, you can first short connect the LPP plug on the main control board and the neutral line N on the motherboard, the indoor unit is running normally, you can determine that the main board or display board of the indoor unit is fine, and the fault appears on the indoor and outdoor unit connection wires, plug joints or low-voltage switches of the outdoor unit.

Judging the interior. External unit connection wire and plug, adjust the multimeter to the ohm block, connect one meter pen to the unplugged LPP protection wire on the motherboard, and connect the other meter pen to the neutral line N, if the resistance value is 0, it means that the fault is on the low-voltage switch, otherwise it is a line problem. Use the pressure gauge to determine whether the system is leaking or clogged.

1. Protection caused by temperature:

1) Lack of refrigerant or expansion valve opening is too small, the return air temperature is too high, resulting in the exhaust temperature exceeding the protection temperature, temperature protection (accompanied by low pressure).

2) The return temperature is too high. This leads to an increase in the exhaust temperature, which leads to temperature protection (accompanied by low pressure).

3) The expansion valve high temperature package is positioned too close to the compressor. The temperature detected by the temperature sensor is larger than the actual one, so that the expansion valve is opened too large, the refrigerant evaporates incompletely, and part of it enters the compressor in a liquid state, resulting in liquid shock.

4) The working condition of the condenser is relatively bad, the surface of the condenser is dirty (dust or oil) resulting in the inability to exchange heat normally, the ambient temperature of the condenser is too high and the heat cannot be exchanged, and the condensation temperature increases, the condensation decreases, and the pressure from the exhaust to the condenser pipe section increases, resulting in the compressor discharge pressure and temperature being too high (temperature protection).

5) The compressor lacks oil or the motor bearing is damaged, the motor heat increases, and the heat cannot be dissipated in time, resulting in temperature protection.

6) The type of refrigerant charging is wrong (different refrigerants, oil, heat exchanger matching, expansion valve matching, refrigerant charging volume, etc.).

2. Protection caused by pressure:

1) Too much refrigerant. Liquid shock, compressor compression difficulties, and excessive load, resulting in high-pressure protection (the pressure does not necessarily increase during temperature protection, but the temperature must increase during high-pressure protection, because the heat generation of the motor increases).

2) The pipeline is dirty and blocked. Such as filter blockage, capillary blockage, etc., resulting in an increase in exhaust pressure, thus high pressure protection.

3) There is air in the tubing. Compression is difficult, resulting in high pressure protection.

4) The low pressure pressure is too low. Causes: (1) too little refrigerant in the refrigeration system, (2) blockage of the indoor heat exchanger or filter, (3) too small opening of the electronic expansion valve, (4) low speed or stop of the fan in the evaporation part, (5) semi-blockage of the refrigeration system (dirty blockage, ice blockage, oil blockage).

The high-pressure protection of the outdoor unit compressor is nothing more than the following reasons:

If the refrigerant is excessive, connect the pressure gauge to discharge the excess refrigerant.

If the condenser of the outdoor unit is dirty, clean the condenser of the outdoor unit and improve the heat dissipation conditions of the condenser.

Outdoor fan (cooling tower) capacitance attenuation, the speed is too low, you can replace the capacitor of the fan.

The pressure switch itself fails and can be replaced.

The high pressure alarm is because the discharge pressure of the compressor is too high, and if the high pressure warning value is not set properly, it needs to be readjusted, and if the high pressure protector fails, it needs to be replaced with a new one. 1. The evaporator is dirty and blocked. The most common reason for the high voltage protection of the air conditioner is because the air conditioner does not dissipate heat well, of course, the air conditioner evaporator may be due to the poor heat dissipation of the air conditioner.

Dirty blockage, these things are related to each other. Solution: Clean the evaporator of the air conditioner regularly to ensure that the evaporator will not be dirty.

2. The fan of the external unit is broken. If the fan of the air conditioner is rusted or stuck due to rainwater, the fan speed will slow down, and in serious cases, the fan will be damaged, which will cause the air conditioner to be protected by high pressure. Workaround:

Clean up the rusty iron of the air conditioning fan bearing in time, which can better ensure that the fan rotates more smoothly and faster, and the problem of high pressure protection of the air conditioner will be solved. How to maintain the air conditioner? First of all, you need to turn on the air conditioner, and under the condition of ensuring ventilation, clean the air conditioner and clean the shell of the air conditioner.

Then open the shell, take the filter under the water pipe to rinse, do not clean with chemicals, so as not to affect the use of the filter. If the water flow can't clean the dust of the filter, you can use a dry rag or a small brush to wipe it gently, don't put the filter under the sun to expose it, you can find a cool place to dry it naturally.

Compressor overload protection will trip, indicating that the system is too high-pressure, the pressure is too high, or the overheating current is too high. Causes and exclusions of high pressure, high pressure, and overheating: 1. Refrigerant.

Plethora. Reduce the refrigeration dose appropriately.

2. Poor heat dissipation. Check the condenser pipe for dirt and dirt and clean the condenser.

3. The pipeline system is blocked. Refer to the pressure gauge.

Judgment, exclusion, and re-systematic processing.

4. Dust and fouling of the evaporator or filter screen. The airflow becomes smaller, the system pressure and temperature are unstable, and the evaporator or filter is cleaned.

5. Fluoride deficiency is also possible.

When there is a lack of fluorine, the exhaust temperature of the compressor will be overheated, which will make the overheated negative permeation load protection switch trip. The electrical problem is:

1. Control circuit board failure.

2. The temperature sensor is overloaded and the information is wrong.

3. The power supply plexus is late and the wiring is loose and the contact is poor.

4. The starting capacitor or compressor starting coil is burned out.

1. Dirty blockage of the evaporator: The most common reason for the high-voltage protection of the air conditioner is because the air conditioner does not dissipate heat well, of course, the poor heat dissipation of the air conditioner is caused by the dirty blockage of the air conditioner evaporator, these things are related to each other, and the solution is to clean the air conditioner evaporator regularly to ensure that the evaporator will not be dirty and blocked.

2. The fan of the air conditioner is broken: the fan of the air conditioner will be rusted or stuck due to rain, which will slow down the wind speed of the fan, and the fan will be damaged in serious cases, which will cause the high-voltage protection of the air conditioner, and the solution is to clean up the foreign matter of the air conditioner fan bearing in time, and it is best to drip some lubricant on the fan shaft, so as to better ensure that the fan rotates more smoothly and faster, and the high-pressure protection of the air conditioner will be solved.

3. Air conditioning outdoor unit blockage: Some users place sundries around the air conditioner outdoor unit, so that the air conditioning outdoor unit is covered by things, so that the heat dissipation of the air conditioner outdoor unit will be abnormal and cause the air conditioner to appear high-voltage protection, the solution is to remember that the air conditioner outdoor unit is forbidden to place sundries around the outdoor unit, and it is forbidden to cover the air conditioning outdoor unit with things, although covering the air conditioning outdoor unit can effectively prevent the air conditioner from being blown by the wind, sun, and rain, but it will affect the heat dissipation of the air conditioner, which will lead to high-voltage protection of the air conditioner.

4. Too much refrigerant: too much refrigerant in the air conditioning pipeline will also lead to high pressure protection of the air conditioner, and the solution is to release the excess refrigerant.

5. High outdoor temperature: when the weather reaches 43 degrees Celsius, the air conditioning refrigeration process, there will be heat dissipation difficulties, and it is easier to have high pressure protection, this situation is only for the external environment temperature exceeds the standard situation will occur under the change of attitude, the solution is that when the outdoor temperature is too high, the air conditioner will be protected and shut down, we can temporarily turn off the air conditioner, wait for a period of time and then turn on the air conditioner.

<> main reasons are:

The air filter is cloggedIf the air filter is not cleaned for a long time, dust and miscellaneous particles will accumulate inside the indoor unit, resulting in reduced cooling efficiency and high-pressure protection of the compressor. At this point, the air filter needs to be cleaned or replaced.

Insufficient refrigerant:That is, the amount of refrigerant (refrigerant) in the air conditioning system is insufficient, resulting in the air cannot be fully cooled. At this time, the compressor needs to run at high speed to make up for the lack of refrigerant, but at the same time, it will also cause the compressor to start with high-pressure protection.

At this time, it is necessary to add an appropriate amount of refrigerant.

Condenser failure:The condenser in an air conditioner is one of the main devices that transfer heat to the outdoors, and if the condenser fails, it can also cause the high-voltage protection to kick in. At this time, it is necessary to check whether the condenser is damaged, and replace or repair it in time if necessary.

The fan is not working:Gree air conditioner needs to dissipate heat through a fan, if the fan of the outdoor unit or indoor unit is not working, it will cause the high-voltage protection to start, which needs to be checked and repaired.

There may be several reasons for the triggering of the high-pressure protection of the Gree air conditioner compressor:

Insufficient refrigerant: When there is not enough refrigerant in the air conditioning system, this can cause high pressure protection to be triggered because the compressor needs to operate at a higher pressure. This is a relatively common reason and often requires adequate refrigerant replenishment and ensuring that the charge and pressure meet the manufacturer's or installer's requirements.

Poor filter cleaning: The air conditioner filter can also accumulate dirt clogging while absorbing dust and stains in the air, which will lead to a reduced air flow rate and poor air cooling effect, which may lead to the triggering of compressor high pressure protection. The filter should be cleaned regularly, and it is recommended that the filter be cleaned or replaced every 3 to 6 months.

Condenser source obstruction: The condenser in a wall-mounted air conditioner is usually located outdoors, and if the surrounding or top is blocked by obstacles to form a heat sink, the temperature will rise when the air conditioner is running, and the air flow resistance will increase, which may also cause the compressor's high-pressure protection to be triggered. Obstructions around the condenser can be cleared in order to increase air flow.

Compressor failure or aging: The compressor in a wall-mounted air conditioner is one of the common damaged components of the cracked town, which can cause the high pressure protection to be triggered if the compressor is damaged or aged internally. In this case, it is necessary to disassemble the air outlet to check the status of the parts including the circuit, refrigeration medium, electronic control, motor and compressor, and repair or replace it accordingly.

It is advisable to contact a qualified aircon professional when experiencing high-voltage protection triggering issues, who will inspect and deal with it on a case-by-case basis to ensure the safe operation of your aircon system.

Generally speaking, it is enough to clean the filter and heat sink, and the heat sink can be cleaned with water to let him fully dissipate heat.

2. Check the condenser inlet filter to see if the filter is blocked;

3. If the machine has been running for a long time, it is considered that the copper pipe is scaled or dirty, and the copper pipe needs to be cleaned;

4. The signal line is faulty, and the wrong signal is sent back, resulting in an alarm;

5. Other special reasons;

Hello! E1 is the fault signal, E1: Compressor high pressure protection. If the compressor current is too large, the compressor is overheated, the exhaust temperature is high, and the module is protected, the overload protector should be checked for disconnection and whether the compressor temperature bag is short-circuited.

Gree E1 exclusion method.

First of all, determine whether the air conditioner has failed after running for a period of time or has failed when it is turned on, so as to distinguish whether it is a system failure or a circuit failure, and the main considerations in the system are:

1 Empty and clean new installation.

2 Excessive flushing repaired.

3 Outside the machine. High temperature and poor ventilation? Dirty? Harsh environment?

Circuit: short circuit the internal machine motherboard OVC and the zero line, if the failure continues, the motherboard is badly replaced, repaired, if there is no failure, check whether the high-voltage switch is turned on under normal pressure The switch should be turned on, such as on, check the high-voltage switch and the OVC connection, if not, repair the high-voltage switch

First of all, determine whether the air conditioner has failed after running for a period of time or has failed when it is turned on, so as to distinguish whether it is a system failure or a circuit failure, the main considerations in the system are: 1 Empty and clean new installation 2 Excessive flushing Repair 3 External machine High temperature Poor ventilation? Dirty?

Harsh environment? Circuit: short circuit the internal machine motherboard OVC and the zero line, if the failure continues, the motherboard is badly replaced, repaired, if there is no failure, check whether the high-voltage switch is turned on under normal pressure The switch should be turned on, such as on, check the high-voltage switch and the OVC connection, if not, repair the high-voltage switch