First, close the power supply, the computer board is not bright? Answer: 1. Check if the insurance is burned out (the GW401D computer board comes with a fuse on the back, now 35 baking, 50 baking) 2. Electric heating dryer to check whether the thermostat is turned on 3.12, 16, 20, 100 bake check whether the transformer is in good condition Second, start the drum does not turn? Answer: 1. Check if the contactor is closed. 2. Check if the insurance is burned 3. Check if the thermal protection is working normally. 4. Check if the belt is too loose 5. Check if the motor is burnt 6. Check if the power supply is out of phase Third, the drying temperature does not rise? Answer: (1) Check if the inlet valve is open (2) Check if the solenoid valve is in good condition (3) Check if the computer board has output (4) Check if the trap is in good condition (5) Check if the fan is turning (6) Whether the fluff inside the machine is unclear (7) Whether the external exhaust chimney of the dryer is not smooth (8) Does the heater upper protection net remain unclear for a long time? Fourth, the fan does not turn? Answer: 1. Check if the contactor is closed. 2. Check if the insurance is burned 3. Check if the thermal protection is working normally. 4. Check if the motor is burnt 5. Check if the power supply is out of phase