Question about Lite On Laars Lite 2 Heaters: 250,000BTU MV Heater

1 Answer

I have a Laars Lite 2 milivolt pool heater. The heater works fine when the temperature dial is set to a setting higher than the water temperature, but when the dial is set to below the water termperature the heater keeps cycling on and off.

Posted by on

  • claude452 May 30, 2011

    This heater has an electronic control module. The temperature setting pot and the temperature sensing probe are connected to this module. The module is powered by the thermocouple and it switches the gas vulve on when the temperature is lower than the setting calls for. It is working fine when the temperature setting is higher than the temperature reading returned by the thermperature sensing probe, when the setting is lowered to bellow the temperature reading, the heater shuts off, but keepes coming on every few seconds. As soon as the main burner turns on, it shuts off.

    The defect is in the thermostat system, which is what I descibed above. I suspect that either the thermocouple is defective (tests so far have not been conclusive), or the electronic module. The electronic module is work over $200, so I don't want to replace it to find out that the problem is still there.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Lite On Master
  • 43,501 Answers

Hi,
I would suspect that the thermostat is bad...however to pinpoint the problem exactly you would need to test it with a meter...this is a bit harder on a millivolt system as the voltages are very low and harder to detect...
So the best way would be to just disconnect the thermostat and see if the heater still cycles...it not, then the thermostat is the problem...replace that.... if it still keeps on cycling, then you will need to figure out what is causing it to cycling on and off...

heatman101

Posted on May 30, 2011

  • D. Floyd Kolb
    D. Floyd Kolb May 30, 2011

    I would replace the probe (thermistor) before going with the module....it is not common for the thermistors to go bad and cause this type of problem...

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Main burner will not lite


There can be a number of things that can cause this symptom. There are several sensors that detect whether there is enough water flowing through the heater, whether the water temperature is higher than the setting or whether there is some internal problem in the heater, etc. I recommend you call the Laars technical support line and they may be able to help you determine the path to correct the issue. I hope this helps.

Aug 21, 2011 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Hi! I moved into a bank owned home with a hot tub that has a gas LAARS LITE 2 Teledyne heater. It is not working, so I had someone come out and check it. He said I need to purchase a pilot assembly before...


Go to www.laars.com and download a manual for your model. Get the model number from the heater, and look up a manual. If yours is a milivolt model, the pilot must be working to troubleshoot further. The manuals will be full of information.

Oct 01, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

The heater come on and cycles on and off, but the water no longer reaches the correct temperature. Pool techicina has replaced the thermostat and disassembled and cleaned something, but it still will not...


This could be the flow rate / value...maybe the unit is under rated in its BTU value. But if it did work fine and heat the water ok then its not this...next thing would be the system control switches...each of these needs to be tested one by one to see if it cutting out the system too early...failing that it is the flame being produced and the heat value is cold see if the flames are blue or yellow...blue is fine nice and hot yellow is too cold to heat the water passing through

http://www.laarsman.co.uk

Miles

Jun 05, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Pilot is light. unit will not go on


Check milivolts at the thermopile. Shoud be between 650-750 mV
Replace terminals and check the pressure switch

May 27, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Teledyne Laars LD250 Propane Pool heater cycles on and back off


Do you replace the thermopile or check the milivolts?
Check the Pressure gas
You need replace all of them terminals and check again the milivolts at the gas valve

Apr 01, 2010 | Teledyne Laars Laars Lite 2 Pool Heater...

2 Answers

Electronic pilot lights but unit will not fire


Make sure the pipes are full of water. Check the thermostat to see if it is calling for heat. Make sure the thermostat is set to a temperature higher than the current temp of the water. If all those things are OK then the gas valve coils may have to be replaced.

Jul 19, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

1 Answer

Main Burner Will only stay on with mid range temperature setting


Thermostat is bad. There is a micro switch behind the dial that reacts to the temp probe and you may try cleaning it out first but in my experience replacing the t-stat is usually required.

Jul 04, 2009 | Jandy Laars Lt 250,000 Btu Heater

2 Answers

Won't fire


It may also be the high temp switches under the 2" inlet/outlet header. The 150 degree high-limit switch sits horizontal and corrosion happens often there. But be careful removing as if the header is corroded and the switch is also, water will flow out , so be ready to bypass the heater. You will have to replace the header. Try to jumpe that switch out and I'll bet the heater fires up.

Jul 10, 2008 | Lite On Laars Lite 2 Heaters: 250,000BTU...

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

51 people viewed this question

Ask a Question

Usually answered in minutes!

Top Lite On Heating & Cooling Experts

paulcarew

Level 3 Expert

2461 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Lite On Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...