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How to bypass pressure switch on Lars Lite 2 pool heater?

Installed new pressure switch in a Lars Lite 2 pool heater and it still isn't kicking in. How can I bypass pressure switch to test?

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Jump across the two leads on the switch with a jumper lead (alligator clip leads)

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Posted on Jul 02, 2009

  • Ben Bydem Nov 02, 2012

    Thanks, saved my pool heater heat pump -going crazy- delima! I replaced a solarium pc board but it still would not work now I know for sure it was the water sensor switch, the replacement water sensor switch was bad too.1

  • Ben Bydem Nov 02, 2012

    Great worked for a Solarium pool heat pump that was driving me crazy! Replaced a pc board and pressure sensor switch with a bad one. Thanks for a simple test that worked.

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1 Answer

The pilot light is on but it will not start the burners how to test or bypass


this can be caused by a few different items. it can be a faulty/broken flow sensor, broken pressure switch, bad fireman switch. the best bet is to get a qualified pool heater technician to fix it properly. bypassing any of these safety devices is a bad idea

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Teledyne lars heater, pilot is on but wont fire up, whats wrong?


Somewhere in your "safety loop" something is open. Like old fashioned Christmas lights if one light goes out the whole circuit dies. Instead of bulbs you have a fusable link (rollout sensor), a pressure sensor, the on/off switch , the thermostat(s), and two high limit switches.
The fist thing is to clean/backwash the filter to make sure it's not simply low pressure causing the heater not to fire. If that is okay the problem may lie in any one ore more of the switches and sensors mentioned. The gas valve itself may also be the cause.

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FLO is an open circuit error. you have several other safeties other than your pressure switch

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Though the pilot lite is on the heater burners won't come on. We had very bad storms the past few days and I wonder if that affected the heater in any way. Is it the pressure switchor there's a little...


try bypassing pressure switch, if htr fires,it is either faulty or out of adjustment.storm should have no effect on a millivolt heater unless it took a direct lightening hit. let me know how if it works out

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LARS LITE #LLG175N BURNER WON'T STAY LIT.


Make sure your pool filter is clean. Low water flow through the heater will be detected by water pressure switch

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Lars Lite 2 pool heater will not ignite


The easiest way to troubleshoot any heater, is to call the manufacturer. Their techs will walk you through each possible problem and solution until you find the answer.

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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.

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1 Answer

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This happened to me and the tech came out and change the pressure switch and it worked fine afterwards

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