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

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Raypak 2100 Heater wont fire unless the pressure switch is jumped. Replaced pressure switch and still same issue. Whats next?

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Usually when these are plumbed in there is a bypass valve allowing you to run your filter and system withouth the heater. There would be a valve before and after the heater (which should be open) and a valve connecting the inlet and outlets ( this valve should be closed) Make sure you're not "bypassing: most of the water flow. If this isn't the problem then try the following: This switch is designed to prove flow. If you don't have enough flow to cause enough back pressure to make switch, then it assumes you dont' have flow. First make sure your filter is clean, and your skimmer and pump baskets are clean so you're pumping maximum volume of water. If these are clean have an assistant or two hold their hands on your discharge ports in the pool. If this backpressure cause the switch to close then you might try slightly smaller return jets to your pool. You can not the pressure on your filter and compare it to the pressure setting on the switch.

Posted on Jul 04, 2010

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More likly you have a dirty filter. Or a plug in a line. Test this by jumping your pressure switch. You can also check thr roll out switch the wire that rung along the fire wall just above the burners. It will have a black cover about two inches long on it that has a switch that is cased in wax if the fire rolls out the front of the cabnet the wax melts and shuts the heater down. Check this by jumping also. I hope this helps.

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You didn't indicate what model heater you have, but here are some of the fault codes you might see. Could it have been GVO? You can download a manual for your exact model at www.raypak.com
BD1 Board failure
EEP Microprocessor error
FAN Blower pressure failure
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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.

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you may have a bad pressure switch.if you are getting flow thru the heater and this code is comeing on there are only two reasons.No flow or bad switch.

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