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My Hayward natural gas heater is two years old and went to use it. I pressed the mode button to pool and service light came on and also read low in temperature screen.

Posted by billhumphrey on


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SOURCE: heater temperature control buttons

The board is bad. The part number is IDXLCPA1930. Expect about a $400 replacement cost.

Posted on Dec 21, 2008


John Prohaska

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SOURCE: Trouble shooting Hayward pool furnace

Big enough propane tank? proper pressure reducing valve on the propane? Check both of those.

Posted on Jun 14, 2009



  • 139 Answers

SOURCE: hayward pool heater c4205 has error message of LO

lo usually indicates insufficient water flow and/or pressure switch malfunction.make sure filter is clean and pressure is in normal range

Posted on Jun 21, 2009



  • 78 Answers

SOURCE: Hayward pool heater wont stay lit

Follow the troubleshooting guide on page 36 of this owners manual. It will walk you through problem solving...

Posted on Apr 22, 2010



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SOURCE: Hayward H400 Pool heater will not stay lit

"IF" - Hayward Pool Heater Fails to Ignite: the most common reason for this problem is insufficient gas supply. The Hayward heater LED display will show a diagnostic fault code of "IF" which stands for Ignition Failure. Undetected gas pressure problems if not investigated properly may result in unnecessary replacement and servicing of your Hayward Pool Heater.

Posted on Apr 23, 2010

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I have Hayward H400IDL2 heater I recently had #1 and #2 1.5 amp fuses blow. I replaced them and then the #4 2.5 amp blew so I replaced it. When I press the mode button to spa the heater blower comes

Good Day, missed your post for a few days. #1 & #2 fuses are on the high voltage side. This could mean a problem with incoming voltage or a bad fuse or main circuit board. Call our tech line at 908 355-7996. I have attached a link to the manual.

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You can find a Hayward warranty service provider in your area by entering your zip code and selecting "product repair or service" on Hayward's locator page of their website, found here:


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It is probably not sensing flame. You either have a clogged orifice underneath the flame sensor and you probably need to have the gas pressure assessed, meter size and gas valve pressure adjustment. These heaters need 2" wc of gas pressure.

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Have pilot light lit but unit willnot come on hayward h350 heater

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