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Re: Where is the pressure switch on a 130000 btu raypac...
It should be just inside the door, maybe up behind the thermostat. It is connected to a 1/8" copper tube on one side and has two wires coming out the other side.
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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.
I would agree with you. The pilot generator has probably degraded over the years and is only proving enough millivolts to power the pilot but not enough to run the gas valve for your main burners.
Replacing the pilot generator, preferably the entire pilot assembly, will fix the problem.
Sounds like a limit switch, although it might mot be bad. If the filter is cleaned, and you have a good return from the pool jets, then you may have a problem with the flow valve in the heater. I would try to bypass the limit switches and see if that stops it, but it is dangerous. If you feel capable enough to try, only do so if there is a pressure relief valve on the header (does not come with heater, but if it was installed correctly then the installer would have to have put one on).
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