Why does the Gree air conditioner not start and displays H5? Hangzhou air conditioning maintenance

H5 displayed on Gree air conditioner indicates module protection, which means the air conditioner may have poor heat dissipation from the power module. Check the operating current of the compressor, the speed of the outdoor fan, whether the heat dissipation of the outdoor unit is good, and whether the heat dissipation paste between the module and the heat sink is evenly applied, etc. You can use the troubleshooting method to test, disconnect the compressor and turn it on to see if the U, V, and W output AC voltages are balanced. After running for a while, see if it is still displayed. If it is displayed, it should be the mainboard. If it is not displayed, it should be poor heat dissipation of the outdoor unit. Other reasons and solutions: 1. The outdoor unit of the air conditioner does not dissipate heat well. Many users barely know how to maintain their air conditioners when using them. The fins of the outdoor unit condenser are covered with a thick layer of dust, causing poor heat dissipation of the outdoor unit and causing the module protection to display the H5 code. 2. The power supply voltage is too low. H5 module protection will also occur when the voltage at home is lower than 220v. Maintenance personnel have encountered many situations where H5 is displayed when the voltage is low. 3. The heat-conducting silica gel under the outdoor unit module of the air conditioner is uneven. High-power transistors and modules rely on heat sinks to dissipate heat. In order to achieve better heat dissipation effects, a layer of thermally conductive silica gel is directly applied to the modules and heat sinks. If this layer of thermally conductive silica gel is not applied evenly when it leaves the factory, it will take a long time. If the module is too long, there will be a gap between the module and the heat sink, resulting in poor heat dissipation of the module.