Question about Hayward H-series Electronic Gas Pool Heater H400

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The digital display panel on my hayward h400fdn gas heater is not working and it appears that all the fuses are fine just wondering if maybe the board itself is bad

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: I just installed a new Hayward H400FDN and it will not stay lit.

I had the same issue...you don't have enough gas pressure.

Posted on May 12, 2009

john224
  • 1378 Answers

SOURCE: Smoke or vapor coming from new h400fdn hayward pool heater.

Not at all uncommon. New heaters have to glaze over the file tile in the burner chamber and will often smoke and smell during the first week or so of operation.

Using a mirror, check to see that your flames are about 4" proud of the burner tubes when running. As long as they are and the color is a nice blue with little to no yellow/orange color, the heater is fine.

Posted on Jun 14, 2009

  • 64 Answers

SOURCE: Hayward H400FDN won't stay lit

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.

Posted on May 20, 2010

  • 31 Answers

SOURCE: My Hayward H400FDN heater will not switch out of

Try resetting it by turning off the breaker that supplies power to the heater. This should be located in the power box at the pool equipment. It is probably a 15 amp breaker.

Posted on Apr 18, 2011

  • 910 Answers

SOURCE: Hayward H400FDN pool heater It

The Error is Sb which indicates a fault with the Keypad which requires replacing.

There are 2 options for this part.

FDXLBKP1930
http://www.amazon.com/HAYWARD-BEZEL-KEYPAD-ASSEMBLY-HEATER/dp/B004GQHKMK

FDXLBKP1931
http://www.parts4heating.com/Hayward-FDXLBKP1931-Bezel-Keyapd-Assembly-Kit-FD-p/fdxlbkp1931.htm

Posted on Jul 16, 2011

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Not at all uncommon. New heaters have to glaze over the file tile in the burner chamber and will often smoke and smell during the first week or so of operation.

Using a mirror, check to see that your flames are about 4" proud of the burner tubes when running. As long as they are and the color is a nice blue with little to no yellow/orange color, the heater is fine.

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