The heating function fails, what should be done?
1) Check whether the temperature switch is faulty. If yes, replace it.
2) Check whether the airflow loss switch is properly connected and whether the electrical heater circuit breaker works normally. If not, repair or replace them.
3) Disconnect the power supply and check whether the electrical heater is damaged by checking the electrical heater resistance properties with an ohmmeter. If yes, please replace the heater.