The invention provides a control method for a variable frequency air conditioner. The variable frequency air conditioner comprises an indoor evaporator, an indoor unit air inlet temperature sensor, an indoor unit evaporator coil temperature sensor, a four-way reversing valve, an outdoor condenser, an outdoor unit air inlet temperature sensor, an outdoor unit condenser coil temperature sensor, an electronic expansion valve, an outdoor unit exhaust temperature sensor, a compressor and an outdoor unit air return temperature sensor. When some of the temperature sensors are broken down, the influence of the broken-down temperature sensors on an air conditioner system is analyzed, and on the premise that the safety and the reliability of the air conditioner system are ensured, the operation frequency of the air conditioner, the open degree of the electronic expansion valve and the like are appropriately adjusted to ensure continuous operation of the variable frequency air conditioner; and meanwhile, corresponding fault codes are displayed to remind a user to repair. According to the provided control method for the variable frequency air conditioner, when some of the temperature sensors are broken down, the variable frequency air conditioner can still operate continuously on the premise of ensuring the safety and the reliability, the user can use the broken-down air conditioner to the greatest extent, and the trouble brought to the user by the air conditioner fault is reduced.