Question about Teledyne Laars Pool & Spa

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Heater pops when heating on low cycle

I have a Teledyne-Laars natural gas, 125k BTU pool/spa heater that pops quite loudly on the low pump cycle. It does not pop on the high cycle. The heater works fine, except for the unsettling noise. Is there any way to correct this issue?

Posted by Anonymous on

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  • Teledyne Laars Master
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Not enough water flow the water is boiling inside heater

Posted on Nov 06, 2014

5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Pool Heater wont light

NO NO NO the heater is design to work on propane or natural gas only

Posted on Sep 11, 2009

  • 3 Answers

SOURCE: 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

Posted on May 29, 2010

  • 990 Answers

SOURCE: My Jandy Laars Natural Gas pool heater (LJ250N)

Check your heater by-pass valve and be sure it is almost closed. If not that then it will be your internal by-pass. These will force water through heater and keep it from overheating the water inside it and shuting it down. Also check to be sure the baskets are clean and the filter is clean.

Posted on Jun 27, 2010

jharwell668
  • 640 Answers

SOURCE: Sr400na Max E Therm Pool & Spa Heater Dual Electronic Ignition Lo Nox 400,000 Btu Natural Gas: service heater light on?...

Try the owners manual for these pool heaters. They have a detailed troubleshooting guide that should let you know what you need to do.

http://www.backyardcitypools.com/images/bwp/Max-E-Therm-Manual.pdf

Posted on Aug 17, 2010

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