Understanding And Fixing Rheem Pool Heater Water Sw Open Error - SquidAppliances (2024)

I’ve had my fair share of pool heater issues, but one error that always seems to throw me off is the dreaded ‘Water SW Open’ error on my Rheem pool heater. It’s frustrating to see this message pop up on the control panel, especially when I’m looking forward to a nice swim.

To help others facing the same problem, I’ve put together this article to provide a detailed understanding of what causes this error and how to fix it.

So if you’re tired of seeing that irritating error message on your Rheem pool heater, join me as we unravel the mystery behind the ‘Water SW Open’ error and get your pool back up and running in no time.

How can you understand and fix the Rheem pool heater water SW open error?

Understanding and fixing the Rheem pool heater’s ‘Water SW Open’ error involves troubleshooting sensor connections, checking water flow, and possibly replacing faulty sensors. This common issue, often caused by sensor or pump problems, can be resolved without replacing parts by owners with basic knowledge and tools.

Key Takeaways

  • Water SW Open errors are a common issue on Rheem pool heaters.
  • The error occurs due to problems with the sensor that detects the water flow switch status.
  • Troubleshooting steps include checking for loose connections or damaged wiring, inspecting water flow for obstructions, testing and replacing the water pressure switch, and checking and repairing sensor connections.
  • Other measures to fix the error include ensuring consistent and adequate water flow, checking and replacing faulty sensors, recalibrating settings, and inspecting filters, valves, and pumps for blockages or restrictions.

Common Causes of the ‘Water SW Open’ Error

Are you wondering what could be causing the ‘Water SW Open’ error on your Rheem pool heater? This error usually occurs when there is an issue with the sensor that detects if the water flow switch is open or closed.

To diagnose this error, it’s important to understand the functionality of the sensor and how it works in relation to the water flow in your pool heater.

Let’s dive into understanding and fixing this common error.

Troubleshooting Steps for the ‘Water SW Open’ Error

Explore the steps you can take to address the ‘Water SW Open’ issue with your Rheem pool heater. When facing this error, there are several troubleshooting tips and techniques you can employ.

First, check for any loose connections or damaged wiring in the water pressure switch circuit.

Make sure there isn’t any debris or a closed valve obstructing the water flow by checking it next.

Lastly, consider testing and replacing the water pressure switch if necessary.

How to Check and Repair Sensor Connections

To check and repair sensor connections, you can follow these simple steps.

First, make sure the sensors are properly installed according to the manufacturer’s instructions.

Check for any loose or damaged wiring connections.

Next, inspect the sensor wires for any signs of wear or corrosion.

If necessary, clean and tighten the connections.

Additionally, ensure there is consistent and adequate water flow to the heater to prevent any further issues with the ‘Water SW Open’ error.

Checking and Replacing Faulty Sensors

Checking and replacing faulty sensors can be a frustrating task, but it’s essential to ensure the smooth operation of your pool heater. To fix the Rheem pool heater water sw open error, follow these steps:

  • Disconnect the power to the heater.
  • Remove the sensor cover and inspect for any physical damage or corrosion.
  • Replace any damaged sensors with new ones.
  • Reconnect the sensor wires securely.

After installation, re-calibrate the temperature settings and adjust the water flow rate as per the manufacturer’s instructions.

Resetting the Pool Heater and Testing for Success

Resetting the pool heater and testing for success is a crucial step in ensuring optimal performance, so let’s see how to do it.

To reset the temperature settings, turn off the power supply to the pool heater. Wait for a few minutes before turning it back on.

Check if the error message has disappeared and if the heater is functioning properly.

Additionally, check for proper water flow by inspecting the filters, valves, and pump for any blockages or restrictions.

Frequently Asked Questions

Can the ‘Water SW Open’ error be caused by a problem with the pool pump?

Yes, a pool pump malfunction can cause the ‘water sw open’ error on a Rheem pool heater. Troubleshooting the pool heater involves checking the pump’s functionality and ensuring proper water flow for optimal performance.

Is it possible for the ‘Water SW Open’ error to occur due to a problem with the pool filter?

Yes, it is possible for the ‘water sw open’ error to occur due to a problem with the pool filter. Common causes of pool heater errors include issues with the pool filter, such as clogs or low water flow. Pool filter troubleshooting is important in resolving this error.

Are there any common external factors that can trigger the ‘Water SW Open’ error?

Common causes of the ‘water sw open’ error in Rheem pool heaters include low water flow, dirty filters, and faulty pressure switches. Troubleshooting steps to fix this error involve checking water flow, cleaning filters, and replacing or adjusting the pressure switch if necessary.

Can the ‘Water SW Open’ error be resolved without replacing any parts?

To resolve the ‘water sw open’ error in Rheem pool heaters without replacing any parts, troubleshooting techniques can be used. Steps to prevent this error include checking for water flow issues, inspecting the switch, and ensuring proper installation.

Is it necessary to hire a professional technician to fix the ‘Water SW Open’ error, or can it be fixed by a pool owner with basic knowledge and tools?

A professional technician may not be necessary to fix the ‘water sw open’ error in Rheem pool heaters. Pool owners with basic knowledge and tools can try DIY troubleshooting steps to resolve the issue. Understanding the role of the water flow switch is crucial in addressing this error.


In conclusion, understanding and fixing the ‘Water SW Open’ error in a Rheem pool heater is crucial for maintaining optimal performance. By troubleshooting the common causes and checking and repairing sensor connections, you can resolve this issue effectively. If necessary, replace the faulty sensors. Additionally, reset the pool heater and test it for success to ensure that it’s functioning as intended.

Understanding And Fixing Rheem Pool Heater Water Sw Open Error - SquidAppliances (2024)


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