Fifty questions about maintenance of common faults of Mitsubishi Heavy Industries air conditioners!

Fifty questions about maintenance of common faults of Mitsubishi Heavy Industries air conditioners! Fifty-questions-about-maintenance-of-common-faults-of-mitsubishi-heavy-Industries-air-conditioners Mitsubishi Heavy Industries air conditioning common fault maintenance information 1. Small air output and poor cooling effect? There are many reasons: A. The temperature of the outside environment is high, and there are more indoor staff working at full load. B. The power supply voltage is too low, which makes it difficult to start the air conditioner, it will stop after the start or the fuse is blown. It is recommended that the user install a power regulator. C. The air volume of the air outlet that is opened in the room where the temperature of the cold block is unable to drop is not large. This is because the air filter has too much dust. Clean the filter. D. Improper adjustment of the thermostat. E. Poor installation of air conditioner will cause uneven indoor temperature or poor cooling effect. 2. Whether the shutdown of inverter air conditioner is normal: When the user uses the air conditioner, the thermal insulation of the environment is very good, the temperature of the room is very close to the set temperature, and the inverter air conditioner will be shut down at this time. Because even if the inverter air conditioner runs at the lowest frequency, it will produce a certain amount of cooling, but at this time the room has no energy loss. According to the law of conservation of energy, the air conditioner will be shut down at this time. 3. The user inquires that the air conditioner is set at 17 degrees, but when the air conditioner drops to 25 degrees, it will not drop again. Is the air conditioner cooling abnormal? The user set 17 degrees is a temperature that the user expects to reach. The user's air conditioning environment and the outside world always exchange heat and cold. When the cooling starts, the room temperature can quickly drop due to the small difference between the indoor and outdoor temperatures, but the temperature drops to At a certain temperature, when the amount of cold generated by the air conditioner is exactly equal to the energy loss of the room and the outside, the temperature of the room will not drop any more. At this time, the amount of cold generated by the air conditioning cooling is only sufficient to maintain the energy loss of the room. Users need to improve the cooling effect, it is best to recommend that users improve the sealing performance of the room to avoid excessive energy loss in the room and the outside world. 4. The user responded that it was used normally last year, but when it is used this year, there is often a shortage of voltage. Is it easy for the air conditioner to age after one year of use? Ask the user if the power supply voltage is abnormal. If the power supply voltage is abnormal, you can tell the user that the power supply voltage in the residential area where the user lives has not changed, but there are more and more users using air conditioners, and the power supply will be abnormal. Phenomenon, this is not the case of air conditioning aging after one year of use. 5. Why doesn't the remote control display? A. Check whether the battery is installed correctly and whether there is electricity. B. Check whether the contact is bad. If this is the case, the user can adjust the contact piece. C. If it still doesn't work, please visit our outlets for overhaul. 6. Air conditioner leakage (indoor unit) Cause Analysis: A The drain pipe is blocked, falling off or damaged; B The installation is not level; C. Displacement of the drip tray after handling and collision; D The outdoor water receiving container is filled with water, and the outlet pipe is blocked by water (actually, the atmospheric pressure outside presses the water in the pipe). Just pour out the water. E When the indoor air humidity is high, there is a layer of water droplets on the air outlet frame of the indoor unit, on the wind swing blade or on the surface of the connecting pipe, which is normal. Solution: The first, second, and third types require on-site repair service, and the fourth and fifth types require explanation. 7. How to choose the correct air conditioner model and corresponding installation location? When selecting the air conditioner, users should fully consider the heat dissipation conditions such as the size of the room, the structure of the door and window of the room, the orientation, the top floor, the wall, and the sealing conditions; whether the outdoor unit is installed in a sun-proof, dust-proof, and smooth exhaust, etc. Generally speaking: ordinary room: 150-170 (W/m2), living room small office: 160-200 (W/m2), restaurant: 220-350 (W/m2), entertainment place: 200-300 ( W/m2), top floor: 220-280 (W/m2). Mitsubishi Heavy Industries air conditioning common fault maintenance information Daquan 8. There is no response when the machine is powered on, and it will not start First, please check whether the socket has power (you can plug in simple equipment such as fans and lights to try). If not, please check the power supply of your home; if the outlet has power and the air conditioner power cord is not damaged, it is a problem with the power supply circuit inside the air conditioner. Contact the local outlet to repair it. 9. The user's voltage is low and the air conditioner cannot be started, but other brand air conditioners can work normally under the same conditions. How to explain to the user? If the voltage is too high, too low, and the air conditioner is used under such conditions for a long time, it is likely to cause damage to electrical components such as compressors. Mitsubishi Heavy Industries Co., Ltd. sets a stricter voltage requirement from the user's perspective and protects the electrical components inside the air conditioner. Therefore, The air conditioner should work normally. At the same time, in order to reduce the damage of electrical components, it is recommended not to use the air conditioner often under too high or too low voltage. It is best to buy a regulated power supply whose power should be 3-8 times the rated power of the air conditioner. 10. The air conditioner is normal and the room temperature can't drop. How to solve it? Whether the room temperature can be lowered is not only related to the quality of the air conditioning and cooling, but also depends on the quality of the user's room insulation, the degree of sealing, the window area, the orientation, the floor position, the number of door openings, the number of people, and other electrical appliances and heat sources. It can measure the temperature difference between the air inlet and the outlet. If the temperature difference is within the range of 10-13 degrees, there is no problem with the air conditioner. If the user does not accept such an explanation, the user can be advised to install the air conditioner in a room that is slightly smaller or to replace the price difference with a larger model. 11. Why are cabinets above 2P (including 2P) not equipped with power plugs? Because the instantaneous current when the cabinet above 2P (including 2P) is started is very high, which is 2-3 times the running current, the maximum current that a general air-conditioning plug bears is about 15A, and the general plug cannot withstand such a high Current, this will cause the power plug to scorch for a long time, and more serious will cause a fire. To avoid such accidents, the National Security Agency does not allow air conditioner manufacturers to equip the power plug and must use an air switch or a knife 12. After the air conditioner is installed, because the user's power supply is far away, when the user's request to distribute the power cord is rejected by the installer and the user is dissatisfied? The power supply line of the cable puller needs to be done by a professional electrician. The installer is not a professional electrician. For the safety of your electricity, please ask the electrician to come. After the power supply line is completed, a test machine will be given to let you use it with confidence. 13. Why is there water in the nut of the air conditioner outside the machine, is it leaking fluorine? It is not fluorine leakage, please use it with confidence. This is not the reason for the leakage of fluorine in the air conditioner, but a physical phenomenon, because the temperature here is very low, when it encounters condensation formed with the water vaporizer in the hot air, the water drops down or attaches to the copper cap surface The above is similar to the following: when a bottle of mineral water is taken out from the freezer, it will be the same as the water flowing down the wall of the bottle for a while 14. Why does the air conditioner start and stop frequently at noon or in the evening, or the external unit cannot be started? This situation is generally caused by the instability of the user's power supply. You can ask the user about the voltage in the area where you live. Pay attention to whether there are frequent user complaints in this place. Explain to the user: these two periods are used for electricity During the peak period, there is insufficient power, and the air conditioner is a relatively high-power electrical appliance, so it is difficult to start. It is recommended that users buy a regulator and so on. 15. If the air conditioner is not turned on, the running light will blink. Is this an air conditioner malfunction? No, this is the standby display state, which can be turned on at any time, and there is also a reminder function, that is, many users forget to unplug the socket when the air conditioner is not used for a long time, and the light flashes to remind the user. 16. The wind speed of the internal unit is fast and slow, and the wind is loud, why? Check with the user first if they haven't cleaned the filter for a long time. If not, give the user instructions on how to clean it, because the filter will affect the air intake after being dirty, resulting in uneven wind speed. If it still doesn't work after cleaning, you need to send maintenance personnel to check. 17. What should I do if there is no response when pressing the remote control? First check whether the air conditioner is energized (such as whether the running light is on), if the running light is not on, first check whether the next socket has power, or change a mobile socket to test whether the internal unit will supply air; if the running light is on , It is recommended to replace a new battery; if it is not possible to send maintenance personnel to your door. 18. Why does the newly installed machine make a noise when the wind swings? Because the newly installed pendulum shaft has just been too wrinkled, it needs to be run in for a period of time, and it can be dripped with a little lubricating oil. 19. What are the sounds of the indoor unit when the air conditioner is normal? When the air conditioner is working normally, there are the following sounds: A, the wind sound of the air conditioner is running, at this time, the corresponding wind sound can be improved by adjusting the corresponding wind speed B, the heat barrier of the air conditioner plastic parts shrinks, and this sound cannot be completely avoided, only By adjusting the tightness or position of the shell to make corresponding improvements, the sound of refrigerant rapidly vaporizing and liquefying in the pipeline. 20. The air conditioner always shuts down when setting the timer function? Some new remote controllers only have a timer button to set the timing function. During operation, the first function is'timed on', and the transmission signal only has a delay time of 2 seconds, so it is likely that there is no setting during operation. When the timing function is set, the "timing on" signal is transmitted, causing misoperation. At this time, you can first block a hand in the transmitter position of the remote control, and then move the hand away after the corresponding function is set and then transmit signal. 21. Why is there a strange smell when I just turn on the air conditioner? The air conditioner itself is generally free of odor, and the odor may be caused by the following reasons when it is turned on: Odor in the room: When the air is not circulating, it is difficult to smell the odor. When the air conditioner is running, the odor is concentrated to the narrow air outlet, which strengthens the odor that is not usually detected. This can be improved by improving the indoor environment. 22. The temperature displayed on the remote control of the air conditioner does not match the temperature displayed on the air conditioner. The temperature displayed on the air conditioner is the temperature of the air outlet, and the actual temperature in the room is displayed on the remote control. 23. Noise from indoor unit A. There is debris in the machine. B. The mounting plate is not hung properly. C. There is friction between the wind wheel and the motor cover. 24. Stop after the air conditioner starts A. Voltage problem. B. The internal control board problem. C. Problem with external unit capacitance. D. The LCD display of the switch board is incomplete. E. Thermal protection of external unit (such as: long sunshine time and dirty condenser). 25. Why does the newly installed external unit of the air conditioner drip while cooling, but the one I bought last year does not drip? The new installation drip because: A. It may be caused by the leakage of the internal machine-the internal machine water is introduced into the water pipe through the sink and flows to the outside. B. Condensate generated at the copper valve of the external unit. The air conditioner I bought the year before lasted a long time. There was dust on the copper valve and the putty played a role of heat insulation, so it did not drip. 26. Why is the red light on when the air conditioner is in operation, and it doesn't work if you press any key? The voltage requirement during operation of the air conditioner is 195V-245V. When the red light is on, the voltage may be unstable. Unplug the plug for 3 minutes to reset the air conditioner, and then plug it in again. If you are unstable for a long time, it is recommended that the user equip a voltage stabilizer. 27. Why does the air conditioner make a sound of "card, card" after it is turned off? This phenomenon is not only caused after shutdown, but may also occur during operation, mainly caused by thermal expansion and contraction of plastic parts. 28. Why does the wind guide blade of the hook sometimes drip? When the air humidity is relatively high, if the temperature during cooling is relatively low, and condensed water will form at the wind guide blades during the low wind state, this can be eliminated by increasing the cooling temperature and setting it to a high wind state. 29. Why does the running light flash sometimes and sometimes not after the air conditioner is turned off? This is related to the power condition detected by the air conditioner (such as power failure after power off or large power fluctuations), which is normal. 30. Why doesn't the inverter air conditioner stop when cooling? Inverter air conditioner works like this: when the indoor temperature set temperature and the difference are large, the air conditioner runs at high frequency (high power), when the indoor temperature is close to the set temperature, it runs at low frequency (low power), and the indoor unit does not stop , The outdoor unit will only stop when the indoor temperature is below 2 degrees below the set temperature. 31. Why does the air conditioner not cool as soon as it is installed? There are multiple possibilities: (1), leakage of fluorine at the connection pipe joint; (2), leakage point of the connection pipe; (3), incorrect wiring; (4), fuse burning; (5), compressor failure ; 32. The reason for air-conditioning leakage? There are many possibilities: (1), the drain hole of the indoor unit's water receiving tray is blocked; (2), the drain pipe is bent or flattened; (3), the direction of the drain pipe is wrong; (4), the drain pipe joint part is not strict; 33. The reason why the air conditioner starts and stops frequently? There are many possibilities: (1), the power supply voltage is abnormal; (2) poor heat dissipation of the outdoor unit; (3) excessive refrigerant; 34. When the air conditioner is running, it makes a sound Plastic expansion and contraction caused. 35. The users report that the mouse bite the wire when they get into the external machine, especially in the entertainment and dining areas. Is the external machine not well designed? The air conditioner external unit is not designed. 36. Why does the light flash when the air conditioner is plugged in but not turned on? There is a model design that is caused by this or the voltage is too low. 37. How to choose the power cord after purchasing the air conditioner. For air conditioners with an operating current of less than 12A, φ2.5mm2 copper core wire is required and a dedicated line connection is required. The ground wire is clear and should comply with the relevant requirements of GB4706.32. For air conditioners with an operating current of more than 12A, use φ4mm2 or more copper core wire . 38. No condensation water flows out of the external unit? When the air conditioner is cooling, there is condensed water flowing out. If there is no and the effect is good, there is no water leakage in the internal unit, which is generally caused by dry weather or indoor drying. 39. The air conditioner starts and stops frequently and the cooling effect is not good The general reason is that the press starts frequently due to the low voltage. It is recommended to adjust the power supply. The other situation is caused by the high temperature setting. It is recommended that the user set the temperature lower. 40. Why does the indoor unit stop sending hot air for about 10 minutes after the air conditioner heats up for a period of time? Is there something wrong? This is because the outdoor unit needs to be defrosted once after running for about 1 hour. This is normal and will not affect the use of air conditioners. 41. Why does the odor blow out after using the air conditioner for a long time? The air conditioner itself does not produce odor. Generally, the filter and dust screen of the indoor unit are not cleaned for a long time; the surface of the indoor evaporator is not cleaned and maintained easily, which causes mold and spoilage, and blows out odors during startup. 42. The air conditioner starts and stops frequently, and the cooling (heating) effect is poor. In this case, the power supply voltage is low, the capacity is insufficient, and the wire diameter does not meet the requirements. During the peak period of power consumption, the compressor is often started frequently, which prevents the air conditioner from working properly. Just replace the power cord or apply for expansion to solve the problem. 43. The air conditioner remote control fails at night and can only be controlled with a manual switch. The electromagnetic wave radiation of many electrical devices can interfere with the remote control of the air conditioner, and maintenance personnel can be called on to carry out shielding and anti-interference treatment. 44. What is the reason for spraying water outward from the air outlet of the indoor unit? If the water baffle is deformed, falls off, or becomes loose, condensate will drip onto the wind wheel and be thrown into the room by the wind wheel. It can be handled by adjusting or replacing the water baffle. On the other hand, if the cleaning and maintenance are not timely, it will cause dirty blockage. Condensate will overflow from the auxiliary water tank, drip on the wind wheel, and spray water droplets from the air outlet. This failure can be solved by cleaning. 45. The sent wind smells This is due to the smoke and other odors sucked back into the room by the air conditioner and sent out again, not a malfunction

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