Tip & How-To about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

Laars LT400 Manual Download

Laars LT400 Installation & Operation Manual

Models: LX250NL / LX250PL / LX400NL / LX400PL
Models: LT250NL / LT250P / LT400NL / LT400P





Have you lost your Users Manual / Owner's Guide for your Laars LT400 Pool Heater?

Would you like a digital copy of the Installation / Operation Manual for easy searching of terms and quick reference?

Click here to download your pdf version of the Laars LT400 Pool Heater guide.

I hope that helps.

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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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