why is my pool heat pump not working


Author: Poolking - Swimming Pool Equipment Manufacturer

Why Is My Pool Heat Pump Not Working?

A dip in the pool on a hot summer day is an unbeatable experience. However, nothing can ruin that experience more effectively than a malfunctioning pool heat pump. A pool heat pump that stops working can be an incredibly frustrating and discouraging experience. But don’t worry. This article will help you diagnose the issue and provide effective solutions.

Understanding Your Pool Heat Pump

The first step to solving this issue is understanding your pool heat pump system. A pool heat pump is a mechanical device that works by taking heat from the air and using it to heat the water in your swimming pool. The heat pump relies on electricity to power the circulation pump which brings water through the heat exchanger. Once the water is warmed, it flows back into the pool.

If the heat pump suddenly stops working, the temperature of your pool water will also drop. This is an indication that there is a problem that needs to be addressed. Here are some of the reasons your pool heat pump may not be working:

1. Insufficient water flow

2. Poor air flow

3. Low refrigerant levels

4. Electrical problems

5. Dirty or clogged filters

Now let’s look at these issues in more detail.

Insufficient Water Flow

One of the most common reasons why a pool heat pump stops working is due to insufficient water flow. The water in your pool needs to move through the heat exchanger for the heat pump to work correctly. If it does not, the pump will eventually shut down to avoid damage.

To check for insufficient water flow, make sure your pool pump’s basket and skimmer are clean and free of debris. If they are, there may be a blockage in the pool’s plumbing system or a restricted return line. In such cases, it is best to call a pool professional to help you out.

Poor Air Flow

Similar to for insufficient water flow, poor air flow can cause a heat pump to shut down. If air cannot flow freely across the heat exchanger, the system can overheat or the compressor may shut down. The compressor cannot run if it senses the system is freezing up or overheating.

If you suspect poor air flow, check the air filters. Over time, the air filter can become clogged with debris, limiting the air flow. Clean or replace the air filter regularly to prevent this problem.

Low Refrigerant Levels

Another reason your pool heat pump may stop working is due to low refrigerant levels. The refrigerant transfers heat from the air to the water. When it is low, the heat pump cannot transfer as much heat, and therefore the water will not heat up efficiently. Low refrigerant levels may be due to a leak in the system.

If you suspect a leak, call a pool professional immediately. Do not try to fix it yourself as this could be dangerous.

Electrical Problems

Electrical problems can also cause pool heat pumps to stop working. Check to see if the breaker has tripped. If this has happened, simply reset the breaker.

However, if the breaker keeps tripping, it could be due to a wiring issue. Electrical issues should be handled by a professional, and you should never try to fix these problems yourself.

Dirty or Clogged Filters

Finally, dirty or clogged filters can cause your pool heat pump to stop functioning correctly. A clogged filter will reduce the flow of water through the heat pump and put undue strain on the system. Over time, this strain can cause the system to shut down.

Regular filter maintenance must be carried out to prevent this problem. Clean or replace the filters regularly, depending on the manufacturer’s recommendations.


In conclusion, a pool heat pump that isn’t working can be frustrating, but the solutions are not complicated. Check for insufficient water flow, poor air flow, low refrigerant levels, electrical problems, and dirty or clogged filters. Regular maintenance, proper use, and professional service when needed will ensure your pool heat pump runs smoothly all year round.


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