Changsha Gree Air Conditioning Citywide Maintenance 0731--8476^1131
Services Furong District, Yuhua District, Tianxin District, Kaifu District, Yuelu District, Changsha County, and Wangcheng District,
Changsha Gree air conditioner maintenance manufacturer repair point 0731-8476-1131
Gree after-sales maintenance; does not start, does not turn on, indicator light does not light up, does not cool, leakage, move the machine, recharge Fluorine, automatic shutdown, no heating, fault code E1, FH Cleaning and maintenance, 0731--8476--1131
Basic faults of air conditioner:
1: Air conditioner repair and startup. , (Neither cooling nor starting, the power indicator light does not light up)
2: Air conditioning maintenance power indicator light lights up (no cooling, the remote control does not work)
3: Air conditioning maintenance button It doesn’t work (the buttons don’t respond, some buttons don’t work)
4? The sound of air conditioning maintenance is abnormal (the sound of the indoor unit is loud, the sound of the outdoor unit is loud, etc.)
5: Air conditioning maintenance Automatically protects and shuts down when it is turned on (no cooling, indoor unit has wind)
6: Air conditioner maintenance The compressor does not start when it is turned on (no cooling, but the internal and external fans work normally)
7: Air conditioner Irregular automatic shutdown during maintenance (automatically shuts down when the temperature is not reached soon after starting up)
8: There is an abnormal sound in the machine after the air conditioner is turned on (there is a squeaking sound inside the machine)
9 : There is an abnormal sound inside the machine after the air conditioner is turned on (there is a squeaking sound inside the machine)
10: The air conditioner cannot be repaired remotely (the remote control does not work or the sensitivity is not high)
11: Air-conditioning maintenance, the compressor is running normally, but it is not cooling (fluorine deficiency, ammonia leakage)
12: Air-conditioning maintenance, the indoor unit is frosted (the cooling effect is poor, or it is not cooling)
13: Air conditioning maintenance does not defrost (frost cannot be automated, air conditioner internal unit leaks)
What are the specific implementation methods for charging the refrigerant of the air conditioner:?
Fault phenomenon: shutdown Finally, the indoor fan rotates slowly and makes a harsh noise after it is turned on.
Cause analysis: Based on user feedback and phenomenon analysis, it was initially determined that the power supply of the indoor motor was faulty. Check the power supply voltage of the indoor fan. There is 100V voltage on the motor in the shutdown state. After the shutdown, the indoor motor still runs slowly and continuously. The heating of the motor causes the plastic motor frame to deform due to heat, and the position of the plastic-sealed motor shifts. This causes the cross-flow fan blades to collide with the chassis, causing an unpleasant noise and a burning smell. It was determined that the fan control thyristor was damaged.
Solution: Replace the main control board.
Experience summary: The fan speed of the split-mounted indoor unit is controlled by the thyristor. When the power supply voltage is low or the fluctuation is large, it will cause the thyristor single-phase breakdown and the indoor unit will be shut down. The fan still has voltage and the motor will still rotate slowly. Since the thyristor has a single-phase breakdown, the motor power supply has a non-sinusoidal waveform, and the motor will not run smoothly and make a lot of noise.
Case 2: The indoor fan does not stop after shutting down and runs before the fan is turned on
Fault phenomenon: After shutting down, the indoor fan does not stop and runs before the fan is turned on.
Cause analysis: According to the fault phenomenon reported by the user, it was found that the indoor fan was running when the power was turned on. It was turned off after turning it on with the remote control. The indoor fan was still running. It was initially judged that the indoor motor power supply was faulty. Check the power supply voltage of the indoor fan and turn on the power. There is a 158V voltage output on the motor in the state or shutdown state, so the indoor motor runs after power is turned on, so it is determined that the fan control thyristor is damaged.
Solution: After replacing the controller with the same model, the test machine is normal.
Experience summary: The fan speed of the split-mounted indoor unit is controlled by the thyristor. When the power supply voltage is low or the fluctuation is large, it will cause the thyristor single-phase breakdown, shutdown or shutdown. When the indoor fan still has voltage, the indoor fan cannot be turned off.
Case 3. The remote control receiver is broken
Fault phenomenon: The remote control does not turn on
Cause analysis: Check the remote control and point it at the ordinary radio. Press any button on the remote control and the radio will respond, indicating that the remote control is normal and the fault lies in the main control board of the indoor unit or the remote control receiver.
Open the outer cover of the indoor unit and check that the 220-volt input power supply and 12-volt and 5-volt voltages are normal. Start the air conditioner manually. If the air conditioner can start and operate normally, it means that there is no problem with the main control board. The fault location is on the remote control receiver component. After inspection, it was found that the reason was that the insulation resistance of the ceramic capacitor (103Z/50v) on the controller's receiving circuit was too small, only a few kΩ. A good quality ceramic capacitor should be above 10000MΩ. The leakage current was too large, which caused the remote control to not receive.
Solution: After cutting off the 103 capacitor or replacing the display panel, the air conditioner has been running normally.
Experience summary: There are many reasons for failure to receive remote control signals. In addition to the above-mentioned capacitor leakage, soldering of missing parts can also cause failure to receive. In addition, the air conditioner usage environment has a great impact on remote control reception. When the ambient humidity is high, Sometimes, condensation water condenses on the welding points on the back of the remote control display board. The circuit board becomes moldy, the insulation performance decreases, and there is leakage between the solder joints, causing the remote control to not turn on or the remote control malfunctions. Clean the circuit board and dry it with a hair dryer. A layer of glass glue is welded to the back of the remote control display panel, and the remote control can be received normally. Use the AM mode of the radio to detect whether the remote control is transmitting signals. If the air conditioner runs normally after being turned on manually, the main control board fault can be ruled out. From this, it can be determined that the problem lies in the receiver. Parts cannot be simply replaced during maintenance, especially if it is repeated in a short period of time. During maintenance, the cause of damage to accessories should be carefully analyzed.
Case 4: Temperature sensor failure in air conditioner
Fault phenomenon: The heating effect of the air conditioner is poor and the wind speed is always very low.
Cause analysis: Come on-site for inspection, turn on the heating, the wind speed is very low, and the air outlet is very hot. Switch to the air conditioning mode. In the cooling and air supply modes, the wind speed can be adjusted to high or low, and the high and low wind speeds are obvious. It proves that the fan motor is normal, and it is suspected that the characteristics of the indoor pipe temperature sensor have changed.
Solution: After replacing the indoor pipe temperature sensor, everything went normal during the test run.
Experience: When air conditioning is heating, due to the anti-cold wind function, the indoor fan in the indoor heat exchanger of the indoor temperature sensor operates at a gentle breeze when the temperature reaches above 25 degrees Celsius, and the wind speed is set when the temperature reaches above 38 degrees Celsius. Work. The above fault was first observed and found that the wind speed was low and the outlet temperature was high, so the fan was checked to see if it was normal. After determining that the wind speed was normal, it was analyzed that the temperature detected by the sensor may be incorrect, causing the indoor fan to not operate at the set wind speed, so the sensor was replaced.
Temperature sensor faults account for a relatively large proportion of air-conditioning faults. To make an accurate judgment, you must first understand its function. The air-conditioning control part is equipped with three temperature sensors:
1. Room temperature sensor: Mainly detects the indoor temperature. When the indoor temperature reaches the set requirement, it controls the operation of the indoor and outdoor units. During cooling, the outdoor unit stops and the indoor unit continues to run. During heating, the indoor unit blows out residual heat and then stops.
2. Indoor tube temperature sensor: It mainly detects the coil temperature of the indoor evaporator and plays the role of cold wind protection, overheating protection and automatic temperature control during heating. If the coil temperature does not reach 25 degrees Celsius just after startup, the indoor fan will not run. When it reaches above 25 degrees Celsius and below 38 degrees Celsius, the indoor fan will work with breeze. When the temperature reaches above 38 degrees Celsius, it will work at the set wind speed. When the indoor coil temperature reaches 57 degrees Celsius, When the temperature continues for 10 seconds, the outdoor fan will stop running. When the temperature exceeds 62 degrees Celsius for 10 seconds, the compressor will also stop running. The outdoor unit will not be put into operation until the temperature drops to 52 degrees Celsius. Therefore, when the coil resistance is larger than the normal value , the indoor unit may not start or may always run at a low wind speed. When the coil resistance is too small, the outdoor unit frequently shuts down and the indoor unit blows cool air. It plays the role of anti-freezing protection during cooling. When the indoor coil temperature is lower than -2 degrees Celsius for 2 consecutive minutes, the outdoor unit stops running. When the indoor tube temperature rises to 7 degrees Celsius or the compressor stops working for more than 6 minutes, the outdoor unit Continue to run, so when the coil resistance is too high, the outdoor unit may stop running, and the indoor unit will blow natural wind, causing no cooling failure.
3. Outdoor defrost temperature sensor: mainly detects the temperature of the outdoor condenser coil.
When the outdoor coil temperature is lower than -6 degrees Celsius for 2 consecutive minutes, the indoor unit switches to In defrost state, when the resistance value of the outdoor coil sensor is too high, the indoor unit cannot work normally.
Case 5. Air conditioner not cooling, communication failure
Fault phenomenon: The indoor unit "Run" light flashes (the other lights are off), and the indoor and outdoor units do not work
Cause analysis: According to the user's feedback, the power on works normally, and there is no situation reported by the user. However, about 30 minutes later, the indoor and outdoor units stop working, the operating light on the control panel flashes, and the air conditioner does not respond when pressing any button. Unplug the power and restart. After a test run, the machine worked normally, but the same fault occurred 30 minutes later. Since the air conditioning was normal before shutdown, there was no problem with the system. It was initially judged to be an external signal problem, which can also be concluded from the fault display code provided by the company. It is a communication failure. The signal connection line between the internal and external units is normal, so there is interference from external signals.
Solution: Connect a 103 ceramic capacitor in parallel between the signal lines of the computer board, or replace the anti-interference C3Y computer board produced by Huafa and the fault will be eliminated.
Experience summary: During maintenance, be good at observing the indication status of the panel when a fault occurs, and quickly find the cause of the fault according to the fault code provided by the company. If the outdoor pipe temperature sensor fails or the signal connection line of the indoor and outdoor unit is disconnected, the "timing indicator light" without digital display function will flash once/second. If it has digital display function, the E2 code will be displayed, and the three-phase A series "temperature light" will flash. , all other indicator lights are off.
?Hope my answer can help,