How to fix water SW open on pool heater?

What is the water SW open error?

The water SW open error on a pool heater indicates that the water flow switch is not detecting water flowing through the heater. This safety feature prevents the heater from firing up if there is not enough water flowing through it, which could damage the heater.

What are the possible causes?

The most common causes of the water SW open error include:

  • A clogged filter or pump basket
  • A closed valve
  • A faulty water pressure switch
  • A leak in the heater or its connections
  • A problem with the pool pump

Why is it important to fix this error?

It is important to fix the water SW open error as soon as possible to prevent the heater from overheating and damaging itself. If the heater overheats, it can be expensive or even impossible to repair. Additionally, a heater that is not working properly will not be able to heat your pool, which can be frustrating, especially if you live in a colder climate.

How to fix the water SW open error?

To fix the water SW open error, you can follow these troubleshooting steps:

  1. Check the filter and pump basket. If the filter or pump basket is clogged, it can restrict water flow to the heater, causing it to shut down. Clean the filter and pump basket according to the manufacturer’s instructions.
  2. Check all valves. Make sure that all valves leading to and from the heater are open.
  3. Check for leaks. Inspect the heater and all of its connections for any leaks. If you find a leak, repair it immediately.
  4. Check the water pressure switch. The water pressure switch is a safety device that prevents the heater from firing up if there is not enough water flowing through it. If the water pressure switch is faulty, it may need to be replaced.
  5. Adjust the water pressure switch. If the water pressure switch is not adjusted correctly, it may not be closing properly, even if there is enough water flowing through the heater. To adjust the water pressure switch, consult the owner’s manual for your specific heater model.
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If you have tried all of the above and the water SW open error is still persisting, it is best to contact a professional pool technician for assistance.

Tips for preventing the water SW open error

To help prevent the water SW open error, you can follow these tips:

  • Regularly clean the filter and pump basket.
  • Make sure that all valves leading to and from the heater are open.
  • Inspect the heater and all of its connections for any leaks on a regular basis.
  • Have the heater inspected and serviced by a professional pool technician at least once a year.

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