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

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Have a Raypak RP2100. When I turn it on the pilot lights fine but after a few minutes (~30 minutes) the heater turns off and PLT is indicated on the control panel. If I recycle the power it lights fine and repeats after about 30 minutes. It is about 10 degrees below the set point. I had some work done in the house (had to shut gas off at main and replace a line) about two weeks ago. I am wondering if there might be air in that line and it needs bleeding?

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If your Raypack (mine is a 2100 but most have the same electronic ignition pilot) lights and runs for about 2-5 minutes an then shuts off, you need to clean the pilot sensor. The pilot sensor tells the unit the Burners are running. If the pilot sensor becomes corroded, carbon, etc. the unit will light but will shut off after a few minutes as it thinks the unit is not operating properly. The unit will try to re light, but fail, and then PLT will show on the main programming screen. To fix the probelm, shut off the unit power. Remove the pilot assembly which is located at the bottom right of the unit. There is one screw holding the pilot assembly in place. Gently remove the pilot assembly. There is a fork like probe sensor (not the one with ignition and gas feed) that needs to be cleaned. Take some rough sand paper and clean it thoroughly. Re insert pilot assembly and fire the unit. If this fails, clean the sensor again. Problem solved!

Posted on Sep 25, 2010

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Is there a power reset button?


You may want to make certain that the pump is running ( moving water into the heater ) in order to activate the heater. The heater will not try to fire without water moving through it. PLT code means that the Pilot is trying to ignite. If you see nothing on the display, you may want to verify voltage.They are typically wired on the same circuit. Therefore if one has correct power ( activated ) than so should the other.

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spk I think means spark for ignition and plt means pilot so i assume the heater tried to light but the pilot light is not staying on. could be dirtly contact on the ignition spark plug or dirty pilot flame need to be cleaned and the unit serviced.


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Plt means pilot light failure. the heater has failed to ignite. either the ignition unit needs cleaning or replacement or the pilot light valve where the flame is, has got dirty and needs a service.

recoment you get a heating service engineer to have a look at it.


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Probably no need to replace pilot. Just clean it. If your Raypack (mine is a 2100 but most have the same electronic ignition pilot) lights and runs for about 2-5 minutes an then shuts off, you need to clean the pilot sensor. The pilot sensor tells the unit the Burners are running. If the pilot sensor becomes corroded, carbon, etc. the unit will light but will shut off after a few minutes as it thinks the unit is not operating properly. The unit will try to re light, but fail, and then PLT will show on the main programming screen. To fix the probelm, shut off the unit power. Remove the pilot assembly which is located at the bottom right of the unit. There is one screw holding the pilot assembly in place. Gently remove the pilot assembly. There is a fork like probe sensor (not the one with ignition and gas feed) that needs to be cleaned. Take some rough sand paper and clean it thoroughly. Re insert pilot assembly and fire the unit. If this fails, clean the sensor again. Problem solved!

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1 Answer

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Well your right it is your ignighter the spk is spark the plt piolet light this pc is about 200 .

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