Question about Raypak Rp2100 Pool & Spa Heater Lonox 407k Btu Natural Gas Polymer Header Digital Rp407aenc

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My raypack pool heater rp 2100 starts to heat and than stops, if you let it set for a few min and do it again the burners kick on than go out after a min or so?

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Check your water pressure switch. There could be a clog or it could be defective. I think Id remove it, turn on your filter pump and blow out some water then replace it. You can check the switch with an ohm meter. Remove the leads from the switch. With the pump on, the switch sould read "short". With the pump off, the switch should read "open".

For your heater to work, you must have fuel (gas or what ever) and you must have water pressure (your circulator pump operating).

Posted on Sep 07, 2009

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  • jigs1 Aug 18, 2011

    How to remove the pressure switch !? Just turn it counter clockwise. And when you say the switch, you mean the "whole black switch with round circular turn wheel below it and mounted to a cylindrical shape" which then goes into the inlet pipes.

    Thanks

  • A Miller Aug 18, 2011

    Pressure switch looks just like a oil pressure switch on a car ... standard pipe thread goes into the heater somewhere ... two wires attached to it on the top or side ... . To prove or disprove, short the wires out - you heater should run. If you are CERTAIN you have water flow of sufficient pressure and it runs when you short the wires together, replace the switch.

  • jigs1 Aug 19, 2011

    Thank you Milleraba, so how do you remove the switch ? With hand, just twist it counter-clockwise or use a wrench or something !? And I presume with the pump not running, right. I am not a handy person and hence being extra cautious about not messing something else.

    Yes, when I short the two wires OR hold the pressure switch down (press it down - makes a click noise), the heater starts working.

  • A Miller Aug 19, 2011

    Yes ... with the pump off ... It should come out with channel lock pliers ... lefty - loosey - rightie tightie ... Get a new switch at your pool place. You will need a little teflon tape - wind it on the threads to help seat the threads. You dont have to kill it when you put it in. Just snug it up so it doesn't leak.

    My pleasure to give you some assistance.

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