Question about Jandy Lite2 LG400 Ceramic Compact Heater

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Jandy pool heater model #LT400N-L service and ES1 light blinking

I have a Jandy pool and spa heater model #LT400N-L. The service and ES1 light are blinking and the spa will not heat.

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The heater won't fire up if there is no or inadequate water flow. Ck water pump and filters.

Posted on Jun 01, 2009


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Posted on Jan 02, 2017


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Pressure switch light going off and heater won't start

back wash filter. clean out pump basket, ensure you have proper water flow. Once you have ensure proper water flow and problem still exists, you will most likely have to replace the pressure switch

Mar 17, 2014 | Jandy Laars LX Pool Heater / 400,000 BTU /...

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Jandy lt400N L hi limit switch is showing. What can i do on my own to try and fix before calling service? Need details boys.....thanks :)

If you have a volt/ohm meter and you call Jandy technical support at 800-822-7933 number they may be help you resolve this issue.

Please let me know how this works out. Thank you.

Sep 02, 2011 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

Jandy LT400 ES1 light blinking because vent on top was blocked while unit was running

The manual manual says to check the flue (blower motor). The ES1 fault probably means emergency shutdown 1. When the flue was blocked it likely overheated something like the blower motor or some safety device and the system board is now detecting this problem and is indicating ES1.

If one of my customers had this issue then I would be prepared to open the heater and probe locations in the heater with a volt/ohm meter while on the phone with Jandy's technical support number, 800-822-7933. They are likely to help you diagnose this issue and recommend a repair.

Please let me know how this works. Thank you.

Sep 01, 2011 | Jandy Laars Lt 400,000 Btu Heater

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