Haier air conditioner shows what fault E7 is

- Is the air conditioner malfunctioning? With my 8 years of experience in repairing air conditioners, I will tell you how to solve these faults, which should save you a lot of detours.

When encountering a failure of the air conditioner, we must strictly follow the scientific procedures, and do not act blindly and disassemble at will when the situation is unclear, the fault is unclear, and there are countless in the heart. The consequence of this often amplifies existing faults, increases operating costs, shortens the normal service life of equipment, and leads to early scrapping of equipment.

The press does not start, there is no problem with the temperature setting, but there is no response when the power is on? If the press does not turn the fan, you must look at the capacitor first.

The capacitor bulge needs to be replaced, and the capacitor is checked for power supply.

If there is a power supply, the overload protection of the press checker is the key.

If there is no power supply in the house, first check the connecting wires.

Secondly, it is best to look at the temperature control and replace the temperature control.

The relay is a key point, and the front drive should be judged.

If all of the above are normal, the following things will be easy to do.

Motherboard repair or replacement is subject to the user's decision.

The air conditioner is not refrigerated well or not refrigerated].

This problem is most common, and the lack of fluorine in air conditioners is the key.

When the machine is turned on, first touch the trachea and judge it by the temperature.

If it is cold, the speed of the fan may be low.

The inner tube scales and dust are cleaned or replaced.

If the inner tube is not considered cool, the thick tube may be flattened.

The return air temperature is not cool, and then touch the intake air to judge.

The air intake is cold and frosty, and fluoride is added to try again.

If the frost slowly disperses, it is a good decision to lack fluoride.

It is not difficult to see the aging of the press, and the lack of exhaust is the key.

Four-way gas is also commonly judged by fluoride collection.

High-pressure scales must be seen to be dirty, and they will be slow to refrigerate.

- Finally, I wish the work to go well, fix the air conditioner earlier, live a happy life——— please give an answer if you think it is good, give a good review, and wish you a better life———

E7 is a fault**, which may be due to a communication failure between the indoor and outdoor boards. Poor indoor heat absorption resistor, poor indoor circuit board. Outdoor low voltage protection. communication failures between the panel and the motherboard, etc.

Thank you for asking questions.

Hello, E7 is a communication failure, this problem is likely to be in the installation of the connection of the indoor and outdoor machine of the line sequence connection error, it is recommended to find after-sales personnel to come to detect, there should be no other problems.

You are welcome to ask the company questions again.

There are several reasons why e7 is displayed:

Communication failure between internal and external machines. If it is a new machine, it is likely that the connection cable is wrong.

If it has been used for a period of time, there is a problem with the communication circuit of the internal or external computer board.

Haier's home air conditioner displays e7, indicating that there is a communication failure between the indoor unit and the outdoor unit. In this case, it is recommended to turn off the power supply of the air conditioner for three minutes and then restart it; If e7 is still displayed, you can contact Haier customer service.

Summary. Hello! E7 Haier air conditioner failure** is a communication failure, the order of connection cable connection may be wrong, it is recommended to find after-sales personnel to investigate.

Haier Air Conditioner Fault** Meaning E1 Room temperature sensor faulty e2 Indoor coil sensor faulty e3 Outdoor ring temperature sensor faulty e4 Outdoor coil sensor faulty e5 Overcurrent protection e6 Pipeline pressure protection e7 Outdoor low voltage protection e8 Panel communication with the motherboard faulty e9 Indoor. There is a fault in external communication.

Hello! E7 Haier air conditioner failure** is a communication failure, the order of the code accompanying the cable connection may be wrong, it is recommended to find after-sales personnel to investigate. Haier Air Conditioner Fault**Meaning: E1 Room temperature sensor is faultyE2 Indoor coil sensor is faultyE3 Outdoor ring temperature sensor is faultyE4 Outdoor coil sensor is faulty E5 Overcurrent protection E6 Pipeline pressure protection E7 Outdoor low voltage protection E8 Panel and motherboard, communication hall mold chain faulty e9 Indoor.

There is a fault in external communication.

6Haier air conditioner E7** should be a communication failure, maybe the indoor unit and the outdoor unit communication line contact is not good, check it. Other brands may be low-voltage protection, check the voltage, or turn off the power and wait for ten minutes to try again. If you can't figure it out, call 4006-999-999 to find after-sales. Intellectual.

Haier air conditioner shows E7 fault**, indicating that it is overcurrent or phase sequence protection external feedback fault.

According to the description, there is no problem after 3 minutes of booting, and e7 appears after 3 minutes, which can be preliminarily judged to be the cause of the failure of the control circuit of the entire indoor and outdoor unit of the air conditioner, including the connection line (the line contact point is not firm, and the failure occurs due to loosening after a long time of booting).

Reasons why Haier air conditioner shows e7:

1. Communication failure of the external machine.

2. Outdoor Zen Removal Frost Sensor Failure.

3. Protection from low power supply voltage.

4. Over-temperature and over-pressure protection of the press.

Haier air conditioner displays e7, which generally indicates that the temperature sensor of the indoor unit is faulty or the line connection is faulty. There are several reasons for this:

1.Temperature sensor failure: The temperature sensor failure in Haier's air conditioner may be caused by aging, damage, deformation, loosening, etc.

2.External ambient temperature changes: Sometimes, the indoor unit displays an E7 error which may be related to the external environment, and the temperature is low or too high may affect the use of the air conditioner, resulting in an error.

How to solve with volts:

1.Check the temperature sensor: Check whether the temperature sensor of the Haier air conditioner is damaged or poorly connected, and if so, you can reconnect or replace the temperature sensor.

2.Replace the control board: If the control board fails, the control board needs to be replaced to correct the error.

3.Replace the line: If the connection line is aging, damaged, etc., the line connection needs to be replaced.

If the above methods do not solve the problem, please unplug and wait for a while before turning the power back on. If the question persists, it is recommended to contact the original after-sales service or professional air conditioner maintenance personnel for maintenance.

The communication between the indoor unit and the outdoor unit is faulty, and the Haier air conditioner has E7, which means that the communication between the indoor unit and the outdoor unit is faulty. The reasons for its occurrence are: failure of the motherboard tank, poor inspiration thermistor of the room return machine, outdoor low voltage protection, etc.

Haier frequency conversion displays E7 fault, and uses the wrench quick check applet to query the fault code.

Fault description: The communication between the indoor unit and the outdoor unit is faulty.

Quick check of the maintenance process given by the wrench.

1. Check the connection cables of indoor and outdoor machines.

Common Causes of Failure:

1.The signal line of the indoor and outdoor machine connection is broken;

2.The terminal crimping of the signal line of the indoor and outdoor machine is not firm and the contact is poor.

3.Poor insulation and leakage between the connecting signal lines;

4.The signal cable is connected incorrectly;

5.The terminal strip of the outdoor unit is seriously aged and corroded.

Diagnosis method: the r*1 European file of the multimeter to detect the connection, use a screwdriver to check whether the line is loose, rusty, poor contact, leakage and other problems, note: for the aging line such as leakage, directly replace the new line.

Diagnostic criteria: check the connection joints, each joint is required to be free of rust and moisture, the joint can not be loose, and there is no poor contact.

Maintenance measures:1Use a multimeter to detect the signal line of the indoor and outdoor unit is broken (the connector is disconnected after the signal line is extended), and the reconnection is firm;

2.The connection between the internal and external machine signal cable is not in good contact and is firmly reconnected.

3.The leakage shed between the signal line joints is poorly insulated, and the reconnection is firmly reconnected or the connecting cable is replaced;

4.The wiring at one end of the black and white wires of the signal line of the indoor and outdoor machine connection is reversed (it should be correctly connected according to the color of the wire and the color of the terminal block).

5.Replace the terminal block.

E7 fault** is a communication failure of indoor and outdoor units. Workaround:

It is recommended to power off the power for 10-15 minutes and then power it on again.

Check whether the wiring of the air conditioner power socket is correct, the live wire, the neutral wire, and the grounding wire are connected according to the specified requirements, and the grounding wire is connected to the grounding body correctly and well.