Question about Hayward H-series Electronic Gas Pool Heater H400

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Heater does not ignite. Not sure if it is not getting gas or if it is not igniting.

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  • Hayward Master
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See if gas valve has voltage if so see if gas pressure is ok if ok see if ignitor has voltage or ohm it out should be about 78 ohms disconnected

Posted on Mar 19, 2016


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Posted on Jan 02, 2017

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SOURCE: Hayward pool heater Model CZ 250 will not ignite

if ignitor sparks i'd say its okay, more likely a gas valve problem.are you sure gas supply is on and purged of air?make sure gas valve(the one gas supply threads into) is in the on position

Posted on Jun 21, 2009

  • 12 Answers

SOURCE: hayward h250ed1 heater wont stay lit

Try cleaning your filter if dirty there will not be enough flow to llet heater fire. If filters clean you can try jumping the pressure switch.

Posted on Jun 25, 2009

  • 760 Answers

SOURCE: Hayward H-Series 200k BTU Millivolt Heater -

You didn't say what terminals you jumped, but I assume it's the flow switch, or it could be the thermostat. The flow switch is located on the piping inside the heater. This flow switch is very important because if you didn't have water flowing through the heater it would oveheat. These do go bad or sometimes just get stuck depending on what type they are. If it's the thermostat, mounted on the front pane you're jumping, then either it or it's expansion bulb is faulty. GOOD LUCK Who needs a heater in JULY?

Posted on Jul 03, 2010

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SOURCE: I have a Hayward 300 pool heater that has an IF

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Use a manometer to read inlet and outlet gas pressure on the gas valve when it gets the 24V...I'll bet your valve is bad and not opening therefore no pressure will be read on the manifold side of the valve. Reading gas pressure on the inlet will verify there isn't an issue with the gas supply.

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Posted on Apr 29, 2011

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"IF" or" Ignition failure", simply means you heater didn't fire. Be sure your gas is on,and if on propane be sure there is at least 30% in the tank (and the valve is open).Also check whether your "Glow plug" ignitor Glows, or your spark ignitor sparks (depending on which kind you have).

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May 24, 2010 | RTO Atwood Water Heater - 6 Gal LP

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We believe we are to turn on the water electric button to start the heater. Directions say the light should go out when ignition occurs. It won't go out.

If your water heater has an electric element, as well as electronic ignition for gas operation, you may be getting them mixed up. One switch should show like a lightning bolt beside it,(that's for hydro use) the other will show a small gas flame beside it.(that's to turn on ignition for gas operation.)
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2 Answers

Hayward pool heater Model CZ 250 will not ignite

if ignitor sparks i'd say its okay, more likely a gas valve problem.are you sure gas supply is on and purged of air?make sure gas valve(the one gas supply threads into) is in the on position

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