Question about Hayward H - Series 400 Heater Top for In - Ground Pools and Spas - Dhi400

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Hauward H400 heater won't turn on

I have a Hayward h400 heater. it won't turn on. what kind of troubleshooting can i do to figure out what the problem is. Thanks, Chris

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Backwash rinse recirculate the filter if u r using a sand filter

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Check pressure switch operation most heaters will not operate without sufficient water flow/pressure. You can use a multimeter to troubleshoot the wiring using the schematic. If its induced draft milivolt ignition verify there is suffiecient gas flow to the unit

Posted on May 26, 2009

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2 Answers

Error code


make sure water filter is CLEAN ! this will throw a code

Jun 22, 2013 | Hayward H-series Electronic Gas Pool...

1 Answer

IF error code when trying to start


Error IF is ignition failure.
Last page shows troubleshoot walk through ranging from low gas pressure to bad gas control valve to failed wiring etc
http://waterheatertimer.org/pdf/Hayward-error-codes.pdf

Oct 28, 2012 | Hayward H-series Electronic Gas Pool...

1 Answer

CAN A OLD STYLE H400 NATURAL GAS BE CONVERTED TO A LP GAS I HAVE A H400PED2 IT DIED IT IS NOT MAKE ANY MORE IF I FIND A H400 NATURAL GAS CAN IT BE CONVERTED


The last I checked a kit was available for this conversion.
I recommendyou call the Hayward technical support at 908-355-7995and they might be able to help you figure this issue out. Ihope this helps.

Sep 17, 2011 | Hayward H-series Electronic Gas Pool...

1 Answer

I can not turn off ob on the screen of my Hayward pool heater


I looked up the owners manual for the Hayward H400 heater and it did not list the "ob" indication. For this reason I would call the and they likely can help you out.

Please let me know how this turns out. Thank you.

Aug 30, 2011 | Hayward H-series Electronic Gas Pool...

1 Answer

H-series Electronic Gas Pool Heater H400: I have an H400 with digital temp control panel, th...


It is likely the keypad that has gone bad. Not difficult to replace. But you want to be sure thats what it is, as it is an electronic part, that is usually not returnable. The part number would depend on the model of the heater. Likely it is a h400idxl2 heater.

May 16, 2010 | Hayward H-series Electronic Gas Pool...

1 Answer

Hi what size and kind of regulator do i need for my hayward propane H250 pool heater i have 2 100 lbs tanks


This is something your gas company should figure and supply for libality reasons. they will be responseable for any damage done from improper pressure. They will need to figure along with heater size and tank size, pipe size and run of pipe along with other varebeles like number and type of fittings on line and other appliences on the feed.

Apr 30, 2010 | Hayward H-series Electronic Gas Pool...

2 Answers

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.

Jun 06, 2009 | Hayward H-series Electronic Gas Pool...

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