Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas
I'm getting an error message: Ext sw 1 So what is wrong?
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Posted on Jan 02, 2017
I had this problem with ours last year. I replaced the water pressure switch and it began working fine. We later had a symptom that the blower would start but it would not ignite. The ignitor rod was corroded so I took it out and sanded it with some sandpaper---worked fine...until I dropped it trying to reinstall and it broke. Bought a new one and it works fine now.
Today's problem is related to the blower now.... it is always something, isn't it?!?
Posted on May 30, 2009
I believe you may have a draft restriction and this may stop the start up diagnostics. The draft detection switch is sometimes restricted or weak. Common problem. Tap the gas valve to see if the winter has caused the valve to seat heavily and stick.
Posted on Apr 25, 2010
Thank you for posting your question here on Fixya.com.
Hi limit switched are embedded in the header and trip when the water temperature is too high. Most of the time the cause is either a faulty sensor or poor flow thru the heater causing the exchanger to overheat. If you have a bypass plumbed into the water lines at the heater close it and see if the problem goes away. If not, you'll need to check the limit switches to see if they are faulty or if a condition exists causing them to trip.
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Posted on Jun 13, 2010
This isn't a solution, but a question after having the same problem and doing some troubleshooting. I removed the water pressure switch in the heater and turned on the pump and water flows nicely out of the copper tube for the water pressure switch. Next I replaced the pressure switch and removed the two wires and shorted them together, being as a switch is either on or off, shorted or open. I confirmed that the short is seen at the connector going into the control panel. I still have the low pressure light blinking. What now?
Posted on Jul 24, 2010
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