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Just had our circuit board on H400FD Haywood pool heater replaced. Heater did fire up but wouldn't go past 65 degrees and went to standby.

Heater is stuck in standby mode and can't get it out of that mode. Won't heat higher than 65

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It may be wired incorrectly, there are 3 terminals for the Hayward heater that connect it to automation.

1 spa
2 pool
3 comm

If they are not wired correctly this issue can happen.

Posted on Jan 02, 2017

  • Pool guy Jan 02, 2017

    Also turn the temp setting on the heater up to 104, that way your automation can heat it to your desired setting without the heater itself causing interference due to a low temp setting

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Posted on Jan 02, 2017

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