Pool Heater Running But Water Not Getting Warm (Solved) - Refresh Outdoors (2024)

When a pool heater is running, it is supposed to warm the water.

This is what you are going to assume is supposed to happen but sometimes that won’t be the case. You will dip your toes into the water and will realize it is still cold.

What does this mean?

This means the pool heater is running but the water is not getting warm.

If the pool heater is running but the water is not getting warm, this means the thermostat is malfunctioning or the filter needs to be cleaned. It’s also possible the pool heater is damaged and has to be replaced. To fix the issue, change the filter and then reset the pool heater.

Resetting the pool heater is a good way to test whether or not there is another issue to think about. Sometimes, the pool heater will need to be reset the right way to get it to work properly.

You do not want to overlook this when it comes to pool safety and making sure the temperature is in your control.

This article is going to show you how to fix a pool heater that is running but the water is not getting warm.

How To Fix Pool Heater Running But Water Not Getting Warm

1. Clean The Filter

You will want to clean the filter.

It’s important to think about how the filter is set up and how clean it is. Sometimes, there will be debris in the filter and this is going to create serious issues about how the pool heater is going to perform.

When the water is not getting through as required, this is going to impact at various levels. It is not just about the contaminants in the water because it will also impact the pool heater’s performance.

You can do two things here.

The first is to simply replace the pool water filter. This is a good way to know it is brand-new and ready to go.

Another option is to clean the filter and remove the debris inside. This will take longer but can work depending on how much debris you are dealing with.

2. Check The Thermostat

The thermostat may be malfunctioning.

This means the temperature that has been set is not what you are getting with the pool water. You will want to make sure the temperature setting is accurate and in line with what you want for the water.

If the set temperature is accurate, it’s time to look at whether or not the thermostat is working properly.

it’s possible the thermostat is not relaying this message to the heater and getting it to warm the water as needed. You should take the time to check the thermostat and make sure it’s in good working condition.

3. Check For Damage To The Pool Heater

Is the pool heater fine?

It is possible the pool heater has been damaged and it needs to be repaired or replaced. You will want to address this to make sure the damage does not worsen.

This is something a person might fret about as a pool owner.

Focus on checking for damage to the pool heater and ensure you are not taking a risk with how it is being managed.

If the pool heater is damaged, this is not a good sign and it means you are going to have to swap out the pool heater.

4. Reset The Pool Heater

The last step is to reset the pool heater.

Resetting the pool heater is a good option because you will get it to start again.

This is going to let you see whether or not something happened that caused one of the internal components to malfunction.

This does happen more often than you think.

Just unplug the pool heater and let it sit for a while. Once you are done, you can then connect it again and that will reset the pool heater.

Try running in the same way and see if it works as you want it to.

Final Thoughts

It’s best to see these details when the pool heater is running but the water is not getting warm.

If the pool heater is running but the water is not getting warm, it might be due to excess debris in the pool filter. Clean the filter the right way. Additional reasons can include damage to the pool heater or a malfunctioning thermostat. It’s also possible the best option is to reset the pool heater by unplugging it.

This will help get the pool heater to work the right way.

A pool heater that does not work is not going to heat the water. This is why you have to be diligent about how you are working on this part of the pool to get it working again.