Why Does My Pool Heater Keep Shutting Off?

Pool heaters are often one of the first things to go when it starts to get cold outside.  Pool heaters work by using electricity to heat water and turn it on and off as needed. When the pool heater is turned off, the water in the pool does not have a temperature gradient which means it will not warm up as quickly. This can cause a number of problems, including algae blooms, high salt levels, and freezing over.

In this post, we’ll show you why your pool heater keeps shutting off and how to diagnose the problem.

Top 5 Pool Heater Problems 

There are several reasons why your heater will shut itself off. The most common reasons include:

1. Heater Comes On Then Goes Off

If your pool heater comes on and then goes off, it might be because of a problem with the wiring. If the heater won’t stay on, it might be because of a problem with the heat exchanger or the thermostat. If the pool heater only comes on intermittently, it might be because of a problem with the timer. You may read also the guide on How to Level Ground for Easy Set Pool

2. Heater not reaching the desired temperature

If your pool heater does not reach the desired temperature, there may be a problem with the heater. The first thing to do is to check to see if the temperature has been set properly. If it has not, adjust the thermostat setting. If that does not work, then the heater itself may be defective and should be replaced.

3. Cycling

One of the most common issues with pool heaters is cycling. Pool heaters use gas to generate heat and when the pool is not being used, the gas can escape and cause the heater to work constantly. This continuous burning of fuel can create a lot of heat and often results in the heater failing.

4. Leaking

Pool heaters can be a hassle to keep working, especially if they leak. There are a few things you can do to prevent it. First, make sure the heater is properly installed and that the seals around the pump and heating unit are intact. Next, check for any damage or leaks around the heater itself. Finally, inspect the pool area for possible sources of water infiltration, such as broken tile or leaking pipes. You may read also How To Keep Pool Cover From Sagging

5. The pilot does not light up

If your pool heater does not light up, there could be a few things wrong. The pilot light might be out, the gas valve might be turned off, or there might be a problem with the electrical system. If you can’t find the problem and the pool is still cold, it might be time to call a technician.


In conclusion, there are several reasons why your pool heater may be shutting off. It could be a problem with the thermostat, the gas valve, or the pilot light. It’s important to troubleshoot the problem so that you can get your pool heater up and running again. If you’re not comfortable doing it yourself, call a professional to help you out.