Question about Jandy Laars Lt 400,000 Btu Heater

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Service light on es1

Service light on es1 laars 400 LT pool heater. pool heater will not go on

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  • Jandy Master
  • 4,290 Answers

Check pressure switch

Posted on Apr 29, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

flacooo1
  • 172 Answers

SOURCE: Laars Lt heater will not start- pressure switch light

it is time to check your filter make sure is not dirty and if your filter is clean and still doing this then the problem can be with one of the safety sensors they do have 2 hight limit switch located in the heater heather they re round with two wires on each one turn power off to heater and get a voltemer reader and check the hight limits for continuty they should read zero on your metter it can be your temp sensor heaters are so complicated that it is always good to have a pool tech service it I was a pool tech in california but now I am located in georgia

Posted on Jun 15, 2009

  • 139 Answers

SOURCE: I have a Laars LT

flame sensor is dirty or faulty.for starts,remove it and clean with steel wool or fine emory cloth.

Posted on Jun 21, 2009

  • 2 Answers

SOURCE: hi limit switch code

mine were corroded, but passed a continuity test. removing the corrosion opened a hole in one of the cases. $30/ea to replace (parts only). then i read how the brass 'screw' they contact with are prone to corrosion (salt pool), not listed in the parts manual, but are available as part# R0383200 (another $6/ea). not a happy jandy/laars/teledyne owner.

Posted on Aug 14, 2009

  • 990 Answers

SOURCE: my laars lx pool heater is blinking LOW PRESSURE.

The heater needs good water flow or it will overheat. You probally have a full basket in your pump or your filter is dirty.

Posted on Jan 21, 2010

  • 1 Answer

SOURCE: Pool heater will light then turns off

check gas pressure you should be getting about 10" water coloum

Posted on Feb 04, 2010

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1 Answer

I have a laars jandy 250 lt gas pool heater that only heats luke warm. The heater cycles normally then heats up but stops before reaching operating temp. No service lights and thermal switches are g


I do not have a handy but mine has a temperature setting at the heater and one on the remote. it is possible that one of the settings is low. the pool or spa temp is sensed at the heater and with the water temp located in the pool lines. so both the control board and the heater are sensing the water temperature.

Oct 09, 2014 | Jandy Laars Lt 250,000 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

1 Answer

Code says es1......what is it.... on laarslt heater


1. Flue gas vent switch tripped.

(manual reset)

1. Verify proper fan operation. Check for restriction or

blockage of flue. Reset switch after problem is

corrected.

2. Vent switch fault. 2. Identify and correct loose connections or replace

switch.

Refer to qualified service personnel.

3. Fusible link fault 3. Identify and correct loose connections or replace

fusible link.
Refer to qualified service personnel.

This happens when the flue gases exceed a certain temperature. This only happens when there is a failed switch, or a bad burn created by incorrect gas or intake air, high wind scenerio or other similar incident to create an incorrect burn.

You may reset the switch manually, but it will most likely happen again, and if it does, its best to call out a technician.

Users manual can be found here:
http://www.jandy-downloads.com/pdfs/LXandLT_H02140B.pdf

Apr 14, 2011 | Teledyne Laars Laars LT Heater 400000 BTU...

1 Answer

Laars LT - "red" light


means calling for heat if heater doesn't come on check safety circuits

Feb 12, 2011 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Where is the manual reset swith for an es1 fan fault on laars LT 400P


turn unit off then turn back on check pressure switch and safety circuit

Aug 08, 2010 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

Laars Lt heater will not start- pressure switch light


it is time to check your filter make sure is not dirty and if your filter is clean and still doing this then the problem can be with one of the safety sensors they do have 2 hight limit switch located in the heater heather they re round with two wires on each one turn power off to heater and get a voltemer reader and check the hight limits for continuty they should read zero on your metter it can be your temp sensor heaters are so complicated that it is always good to have a pool tech service it I was a pool tech in california but now I am located in georgia

Jun 13, 2009 | Jandy Laars Lt 250,000 Btu Heater

1 Answer

Laars Lt spa heater service light


replace temp sensor its by the plumbing inlets or mounted to top of heat exchange

Feb 22, 2009 | Jandy Laars Lt 250,000 Btu Heater

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