Question about Jandy Laars Lt 400,000 Btu Heater

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Heater is off and code says prs

Want to turn on heater for spa

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  • marshtcat May 07, 2009

    Raypak heater won't ignite and says to clean filters which we did and the codePRS displays

  • jmc68 May 11, 2010

    where is pressure switch located on jandy laars lx pool heater? says it is bad

  • ifixpools May 11, 2010

    This is a lack of water flow or the switch not sensing flow when you actually have it.



    What is the application? Gas heater or above ground spa?

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Assuming you have water flow, the pressure switch is bad. It is not sensing flow.

Posted on Jan 01, 2009

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1 Answer

I received a notice that the filter needs cleaning. How do I do that?


THis is a PRS code (clean filter/strainer) correct?
This simply means that either there is no water flowing through the pool heater (possibly due to a dirty filter)
If you know you have good water flow, then your pressure switch has failed. Replace the pressure switch.

May 31, 2011 | Rheem M406A 399K BTU Cupro Nickel Pool or...

1 Answer

Upon start heater comes on for about 5 seconds and shuts down. Then starts again and stops again, and so on. "PRS" appears


PRS means the pressure switch is opening and shutting off the heater as you describe. Either your filter and/or inlet baskets need a good cleaning or the pressure switch in the heater is failing. Try a thorough cleaning first and then replace the pressure switch if necessary.

John

Oct 25, 2010 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

Prs error code, clean strainer


Your not getting enough pressure to run the heater. So you need to clean the strainers and clean the filter. If you have a DE filter you may want to break it down and clean it. While your at this you should check your pressure switch and your by-pass valve.

Sep 06, 2010 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

Raypak 2100 pool heater won't heat, PRS and HL2 error codes.


Well, I replaced the pressure switch with no joy. I tried all 5 levels of pressure 1-5 and every wiring combination. Finally, I returned the new $70 pressure switch and took the 2 wires and tied them together (jumped them). Here's the only downside...If you run your pump in backwash, recirc, waste, or any mode that would cause water to bypass the heater it MUST BE OFF. Otherwise, let it ride. It's working great and I hope to go into October weather permitting.

May 11, 2010 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

RP2100 - screen error code shows RP5 what does


Their should be no RP5 but their is a PR5 or rather a PRS only on the desplay the S looks like a 5. this means low pressure and will usually be a dirty basket on the pump or a dirty filter. It could also be a problem in the pressure switch on the heater but more often than not it will be a clloged basket or filter.

Nov 23, 2009 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

1 Answer

I have a Raypac 2100 digital pool heater and it's reading PRS. Is there someone out there that can tell me where this pressure switch is? According to the guide, PRS means "pressure switch open". If I...


On the side of the heater where the pipes are connected; under the top cover. It is a round disk threaded into the header. It is likely that your filter needs a good cleaning if your heater has always worked reliably in the past. If you have a cartridge filter, it may be time for a new element if you can no longer get it clean enough to get the heater to work.

Sep 26, 2009 | Raypak Rp2100 Pool & Spa Heater Lonox 407k...

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