The central air conditioner has been on for a long time without heating.

1. The air-conditioning filter screen needs to be replaced: excessive dust and impurities accumulated in the air-conditioning filter screen will reduce the air circulation and lead to poor heating effect.

2. Temperature sensor failure: The temperature sensor is used to measure the indoor temperature. If the sensor is damaged or fails, the central air conditioner cannot start the heating mode correctly.

3. condenser failure: the condenser is a key component in the heating process, and its failure causes the central air conditioner to fail to heat.

4. Circuit failure: If the circuit control system of the central air conditioner fails, such as short circuit of the circuit board or loose wires, the heating function will be affected.

5. Insufficient refrigerant: Refrigerant is very important for heating and cooling of central air conditioning, and insufficient refrigerant will affect the heating effect.

6. setting the wind speed too low: lowering the wind speed will slow down the heating speed, and increasing the wind speed appropriately will help speed up the heating.

7. outdoor temperature is too low: when the outdoor temperature is too low, the heating effect of the central air conditioner will be affected, because the heating efficiency will be reduced in a low temperature environment.