There are two main places where the heat pump not producing condensate: one is the surface cooler of the outdoor main unit, and the other is the terminal of the indoor air conditioner (such as a fan coil unit).

Of course, there are always imperfections in the installation, and sometimes the installation does not meet the requirements, which will lead to leakage.

The leakage of air-conditioning condensate involves two aspects:

  1. Leakage of condensate water from the outdoor unit
  2. Leakage of condensate water from the indoor unit


The main engine is generally installed outdoors on flat ground or on the roof of a building. The drainage requirements in such places are generally not high, but condensate leakage may also occur. This mainly occurs in units installed on the roof without waterproofing on the roof. In cold places, if the condensed water is not discharged in a timely manner, the floor will be easily damaged by freezing over a long period of time, resulting in water seepage on the floor.


  1. Do a good job of waterproofing the floor before construction
  2. Centralized discharge of condensed water


Indoor unit condensate leaks mostly occur in the following places:

A Condenser Water Pan
  1. The water accumulation tray is installed unevenly, causing the accumulation of water to flow backwards.

When installing heat pump, the air conditioner has not been installed with a certain slope according to the instructions (ie, the front is high and the rear is low by about 3-5 degrees, or the left side is high and the right is low by about 3-5 degrees, and the drain is at the right rear corner). Just adjust it to normal.

  1. The drain of the water storage tray is blocked.

Because there are dust and other water-insoluble debris in the air, these debris are easy to accumulate during long-term operation of the air conditioner. In severe cases, the drain outlet will be blocked. The easiest way is to find the drain outlet, and then unplug the drain pipe directly from the interface. Use a small screwdriver or other sticks to pierce the debris in the drain outlet, and then rinse the indoor unit evaporator (water pan) with clean water several times to slowly remove the blockage from the water pan. If not, ask a professional to clean it .

  1. Poor installation of the condensate pipe leads to poor drainage and water overflows from the water pan.

-1 Condensate pipe installation without slope

-2 The condensate pipe support interval is too long to cause the pipe to sag

-3 The condensate pipe has no vent holes, which leads to air pockets in the pipeline

-4 Hedge the condensate pipes in pairs

-5 There is no trap in the condensate pipe, resulting in backflow of stagnant water

B Condenser Water Outlet Pipe (Including The Connecting Pipe Of Internal And External Units)
  1. If the leakage is caused by the damage of the drain pipe, the drain pipe should be replaced. Pay attention to choose the drain pipe of the same material, because it is troublesome to replace it, it is recommended to find a professional to deal with it. Reconnect the water pipe, pour clean water into the evaporator (water tray) immediately, check that there is no leakage in the new water pipe, and then wrap the insulation cotton.
  2. If the thermal insulation cotton of the drain pipe is damaged or not properly wrapped, condensed water leaks. In this case, it is enough to repair the damaged part, but it must be sealed well.
  3. The quality of the insulation material is poor, the coldness of the pipeline is transmitted to the surface, and the room through which the pipeline passes, such as the bathroom or the kitchen, has relatively high humidity, and a large amount of condensed water is generated on the surface of the pipeline.
C Air Outlet
  1. The evaporator of the air conditioner is too dirty, so that the condensed water of the heat pump does not flow smoothly, and the accumulated water is carried out by the fan impeller; or because the air humidity is particularly high and the wind speed of the indoor unit of the air conditioner is also high at this time, it is easy to cause the condensed water to flow from the air outlet If it falls indoors, the solution is: A. clean the indoor evaporator, and B. reduce the indoor fan speed.
  2. There is too much water in the water storage tray, and the accumulated water is brought out by the wind blades. For the specific reasons, refer to the first point.

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