The air compressor starts and loads normally, and the frequency is also normal, but the pressure and power don't increase. How can we solve this problem?
First, remove the air filter and observe whether the intake valve can suck in air normally during loading. Only when the intake valve opens normally can air enter the main unit for compression. If the intake valve cannot open normally, air cannot enter the main unit for compression, resulting in no air production. Next, measure whether the 220-volt transformer has output to determine if the transformer is working properly. Then, check the fuse. Set the multimeter to the continuity test mode to check if the fuse is working properly. Next, check if the solenoid valve has a 220-volt power supply during loading. Disconnect the solenoid valve's connector and measure if there is 220 volts of electricity. If there is, the solenoid valve may be faulty and needs to be replaced. It could also be that the intake valve assembly is stuck or the solenoid valve core is blocked; you can disassemble and clean it.
In addition, some users operate their air compressors in harsh environments with a lot of dust, causing the air compressor's door panel filter or air filter element to become clogged, preventing air from entering the intake valve, which also leads to the air compressor not producing air. If the air filter is clean, the solenoid valve has power, and the intake valve opens normally, then it can basically be determined that the problem is with the compressor head. If the rotor is rusty or has friction marks, it will cause internal leakage in the compressor head, resulting in no air production. Of course, severe shaft misalignment in the air compressor head will also result in no air production.