Trouble shooting skills for non heating electric a

2022-08-02
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Troubleshooting skills for air conditioners without heating appliances

1. A Changhong kfr-25gw/h heat pump split air conditioner does not heat. The remote controller is used to test the machine, and there is no hot air in the room. Turn to the cooling state inspection, and the cooling is normal. Open the shell of the indoor unit and touch the reversing valve without heat. Use a multimeter to measure whether the outgoing line of the four-way valve has 220V voltage. When measuring the heating lead terminal, if it is found that the connecting wire is open, connect the open circuit and seal it with plastic insulating tape. Then, power on the test machine and remove the fault

2. One Chunlan kfr-32gw split air conditioner does not heat. Power on and test the machine. There is no hot air in the room. Turn to the refrigeration state and the refrigeration is normal. Open the indoor unit shell and measure that there is 220V voltage input on the lead of the four-way valve. Unplug the two terminal wires of the four-way valve and detect that the coil of the four-way valve is open. Therefore, the air conditioner cannot be switched to the heating state. Change a coil of the same model, power on and test the machine, and the air conditioner restores heating

3. One lg-ls-bo750ht split air conditioner does not heat. Power on and test the machine. There is no hot air in the room. Turn to the refrigeration state and the refrigeration is normal. The coil resistance of the four-way valve measured with a multimeter is good. Open the indoor unit shell, measure that the voltage of ic80 pin of the electric control board is 5V normal, and the voltage of 16 pin is ov normal. Measure that the relay circuit ry-4way of the four-way valve has been damaged. Change an electric control board of the same model, power on the machine for test, and the air conditioner restores heating

4. One Hualing kfr-25gw/jnv split air conditioner does not heat. Start the machine with the remote control, the indoor fan does not operate, and the outdoor compressor operates. Open the indoor unit shell, measure the safety tube on the electric control board, the varistor is good, the transformer output is normal, all connectors are firm, and the resistance of the motor coil is good. The capacitance of the fan is damaged during impulse free discharge. Change a capacitor of the same model and power on the machine for test. Restore heating

5. One Dongbao rf-12w cabinet air conditioner without heating. Power on to set the heating state of the touch switch LCD controller. After the cabinet runs for 30 minutes, the fault indicator lights up and the air conditioner automatically stops for protection. Check that the fuse tube of the main control board is in good condition, and all connectors are firm, and no fault point is found. After continuous inspection, it was found that the LCD control board was faulty, and the RF-1 2W air conditioner of the same model was tested, which proved that the display control board was damaged. Here, the author would like to remind the maintenance personnel that it is only allowed to test the control panel with suspected fault to the air conditioner of the same model. Prevent the air conditioner from joint failure and damage the good control board. Because Dongbao accurately fulfills the national standard that the rf-12w and rf-7w control boards of air conditioners are common, replace an rf-7w LCD control board, power on the machine for test, and the air conditioner restores heating

6. A Beijing electric kfr-18gw split air conditioner does not heat up, and the remote controller is used for commissioning when powered on. There is no hot air in the room. It is turned to refrigeration and the refrigeration is normal. Open the shell of the indoor unit and check that all the plug-ins of the control board are in good condition, and the fuse tube and varistor are in good condition. No fault point can be found at that time. Open the shell of the outdoor unit, measure that the resistance value of the electromagnetic reversing coil is good. When the control terminal is repaired, it is found that the heating control line 21s4 is burned. Deal with the burned part, connect the 21s4 control line, power on the unit for test, and the air conditioner restores heating

7. One Gree KFR-20GW split air conditioner does not heat. Power on and test the machine. The indoor unit has power supply indication. When the remote controller is set to the heating working state, suddenly, the indoor unit displays nothing. Open the shell of the indoor unit, measure the safety tube of the electric control panel, and the varistor is in good condition. Continue the inspection in sequence, and it is found that the connectors at the power input end are not inserted in place, and only the plastic outer sleeve is connected with the plug-in. Obvious signs of ignition and corrosion were found. Clean the insert with emery cloth, and then clean it with alcohol. After 10 minutes, fix the insert again. Power on the test machine and restore the heating of the air conditioner

8. A kcr-30 window air conditioner produced by Shanghai air conditioner factory does not heat. Axial flow fan and compressor do not operate. Use a multimeter to measure the power socket, with 220V output. Open the window machine panel and remove the control switch screws. It is found that there is a dead mouse in the selector switch, which is stuck on the main control contact, causing a short circuit in the internal contact of the switch. The specific test steps are as follows:. Disassemble the control switch, repair the internal control contact, power on the test machine, and restore the heating of the air conditioner

9. One Dongbao kfr-80lw/md831 floor type air conditioner without heating. The operation indicator light on the indoor display panel and the red signal light on the outdoor compressor control panel flash. Because the scroll compressor (model 300dh-47c2) of Guangzhou Wanbao factory is used as the compressor of Dongbao 98 new air conditioner. There is no phase sequence protection on the circuit, and the compressor cannot be reversed. Replace any two phases of the three-phase power supply in sequence, this fault is eliminated, and the air conditioner restores heating. The above 8 cases are a bit of experience in the maintenance of air conditioners without heating, electrical troubleshooting skills and safety precautions. Although the air conditioner and electrical control are complex, the fault is not impossible to solve. 3. For the experiments that need to be done in high temperature environment. As long as you are diligent in writing during maintenance and accumulate maintenance experience of different faults, troubleshooting is not a problem. When you first contact a new air conditioner fault, it is best to trace the circuit diagram and draw a schematic diagram. Because the electrical fault is complex and has strong current, it is better not to conduct live test and maintenance easily without understanding the schematic diagram, so as to prevent personal contact and damage to components. This is the author's experience in electrical maintenance for 20 years. I hope it can benefit you

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