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Hayward h400 (electronic ignition) does not light. Jumped our pressure & limiter switches. Change gas valve. Still not lighting. Have plenty of spark. Help!!

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If you have a multi-meter check for 24 vac between OR & W at the board or on the gas valve (OR & W are the 2 wires that go to the gas valve). Check the voltage while the igniter is sparking.

Posted on Mar 23, 2010

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Ao & po codes on hayward h400idl2


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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

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Need to replace Hayward H400fnd pressure switch


it is connected to the copper line going into the heat exchange two wires going to the board if voltage both sides ok check hi limits

May 08, 2012 | Hayward H-series Electronic Gas Pool...

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I have an H400 electronic heater. I have power to it but when it is turned on nothing happens. I bypassed (hotwired) all the limit switches and pressure switch and even the valve on the advice of a tech...


If you have 24v coming from your transformer it is ok. Then you need to follow that 24v step by step through the system. You can't jump the thermostat so you have to check power in and power out. So this could be the ignition control but first see if you have the power in and out of the temp control. If this is the problem you should try a temp sensor first as it is cheap and easy.

Sep 24, 2010 | Hayward H-series Electronic Gas Pool...

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I have a hayward H400 serise propane heater. I replaced the gas valve. When it goes tot turn on it takes about a minute then starts clicking to ingnite the gas. SSoem time it lights but then goes out other...


0. Check the spark ignitor conection to the board
1. Check the water by-pass valve if you have it
2. Check your gas pressure. (5-7"wc for natural gas, 9-13"wc for propane gas)
3. Clean your filter for your water system or remove it and try again
4. Check the Hi-limits on your heater
5. Replace the thermostat

May 27, 2010 | Hayward H Series Pool & Spa Heater 400k...

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Hayward H400 heater won't light and service light comes on. Also gives a code on screen "AO". I can't find in the owner's manual what that means. It is the electronic ignition model.


This is a code for what is called a prover switch. What it is a circut for the air pressures. Depending on model you can have one or two of these. Their will always be one for the exaust perssure and this will often be the culpret. If the sensor is good a sooted exchanger, rat nests on the exchanger or in the exaust can cause this. If you have a second switch it will be for burner air pressure and you will look for the same problems only inside the burner cabnet. Good luck, I'm sorry I can't be more help. But at least you know to look to the vent system.

Sep 27, 2009 | Hayward H-series Electronic Gas Pool...

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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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I'm trying to start-up a Hayward H400 natural gas heater for my pool. It was brand new last season and worked perfectly. It keeps firing up for a little while (maybe 10 seconds on average) and then shuts...


if means ignition failure check that gas is on, check for fauilty igniter wiring or connections, inspect gas valve wiring measure voltage across gas valve during trial to ignition if 24 volt replace gas valve if no 24 volt replace control module

May 19, 2009 | Hayward H-series Electronic Gas Pool...

1 Answer

Hayward H400 will not ignite


Gas valve.
Gas valves will often stick in the closed position especially after sitting dormant for a period of time.
if you want the posibility of one more season, You can try to tap on the bottom ans side of the valve with handle of a screw driver while it tries to ignite. Note: This is a technician trick, most manufacturers will not approve in fear you are so lacking in common sense you will go out and beat the valve with a hammer, then sue them when it cracks the metal valve leaking gas while you smoke a cigar ultimately relocating your heater on top of the neighbors Buick..so please don't do that. BUT, If the valve opens and heater fires with a few love taps try it a couple more times to see if it will work on its own. It will likely continue to work if so.
You will likely need that gas valve next year anyway.

Apr 25, 2017 | Hayward H Series Pool & Spa Heater 400k...

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