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Jandy Pool Heater model AT550 - what is error D4?

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Posted on Jan 02, 2017

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SOURCE: Jandy lite 2 LG pool heater

ignition control board failure

Posted on Feb 18, 2009

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  • 1 Answer

SOURCE: low pressure reading on Pool Heater

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

  • 21 Answers

SOURCE: FL 4 error, Jandy Lite 2 pool heater

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

  • 1 Answer

SOURCE: Message 'LOW PRESSURE' on my Jandy LX pool heater.

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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