When the air conditioner is heating, the doorman has the sound of boiling water and there is no hot air. What happened?

If you hear the sound of water boiling in the process of air conditioning heating, it means that the air conditioner is still working, but there is no hot air, so it is likely that the original heating is broken. If you hear the sound of water boiling in the process of air conditioning heating, it means that the air conditioner is still working, but there is no hot air, so it is likely that the original heating is broken. If you hear the sound of water boiling in the process of air conditioning heating, it means that the air conditioner is still working, but there is no hot air, so it is likely that the original heating is broken. If you hear the sound of water boiling in the process of air conditioning heating, it means that the air conditioner is still working, but there is no hot air, so it is likely that the original heating is broken. If you hear the sound of water boiling in the process of air conditioning heating, it means that the air conditioner is still working, but there is no hot air, so it is likely that the original heating is broken.