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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)

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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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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...

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

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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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