Question about Raypak Rp2100 Digital 336k Btu Propane Heater

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On my raypak pool heater i get a message that Water Sw is open. What does that mean?

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  • Raypak Master
  • 8,673 Answers

Pressure switch either dirty filters or bad switch or loose wires

Posted on Nov 05, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: pool heater wont fire up

Its just after 1 am here as well, Ontario Canada. Yes, you have to remove the front lower panel by raising it then pulling out at the bottom. Then compare the valve you have with the 2 in the picture on pg 5. If it is easier, you can have your husband call me while doing this and I can talk him through it. My contact information is located on the main page of my company website


Posted on Jun 23, 2009

  • 139 Answers

SOURCE: Raypak pool heater RP2100 error message CLK

you are in fireman switch mode,which means pool timer is ready to shut down pump. clk shuts down heater approx 15 minutes before pump shuts down. this lets heater cool down before pump shuts off.

Posted on Jul 23, 2009

  • 139 Answers

SOURCE: Service light comes on our Raypak RP 2100 pool heater.

this usually indicates a high limit must first ascertain if you have a component failure or a true high tempature condition.your model has 2 limit controls and they are both located in side panel on water in/out header

Posted on Sep 19, 2009

  • 990 Answers

SOURCE: I have a Raypak model 153 pool heater. The heater

For some reason your heater is not recognising the flame when it goes on. The biggest reason for this will be small spider webs in the burner orfaces. These are on the main gas manifold where it connects to the burners. You can get a small wire and bend it to go in these orfaces but the first time you do this it will probally be easer to pull the tray and remove the orfaces from the gas line. Good luck, I hope this helps.

Posted on Nov 28, 2009

  • 1378 Answers

SOURCE: raypak heater. fault cde says (ROL)

Thank you for posting your question here on

Replacing the roll out switch is an easy do-it-yourself repair. Fixing the problem causing the roll out of the burner flames in the first place is a bit more of a pro job. Something is causing to much heat to roll out the the combustion chamber into the control area causing the switch to fail. You will continue to burn the link until the underlying problem is fixed.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


Posted on Jun 01, 2010

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1 Answer

I have a code that says Water Sw Open...Just turned on the gas line from the winter going to start the heater and see this message.

ahh its a pool heater .
cant find a user manual for it
if not sure dont light it up ..till you know its safe

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sw open means open switch check pressure switch to see if voltage both sides if ok check hi limits

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Either keep replacing the switch or find out what is causing the switch to fail. The "plumber friend" should know.

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What does water sw closed mean on my heater display panel ?

showing that pressure switch is closed see if voltage on both sides then check the safety circuit if ok check ignitor

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