Question about Hayward H Series Pool & Spa Heater 400k Btu Propane Gas Milivolt Ignition H400p1

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Hayward H400 runs for 2 minutes and turn off, flames out chimney

Alright I turned on the heater for the first time this year. It runs for about 2 minutes and turns off. At this point the system normal light goes out and it won't restart for a few minutes. The pipe coming out of the heater never even gets very warm. Pressure at the filter housing is 25 psi. I just cleaned the filters and this has been about the normal pressure. What I did notice for the first time was that blue flames come about 4 inches out of the chimney on the thing. I don't remember this before. If this heater is as old as my house then it is from 1997. Worked GREAT last year. Now, even with it heating only the spa, the water coming from the jets was as best warm. Any ideas?

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  • Anonymous May 22, 2009

    I have the same problem, but H300. It heats for about 10 minutes, then shuts off and "normal" light goes off too. This has been happening since we opened the pool a few weeks ago. Worked perfectly well for the last few years...


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Soot on your heat exchanger would explain this. Or leaves or rat nests would do the same thing. You can clean these yourself or get a repairman to do this for you. Just be sure if you have soot on the exchanger use a stiff bristel brush but not a wire brush. The soot as you free it up will be pouder and can explode in a fashion. Be careful and good luck.

Posted on Dec 18, 2009

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Had a power outage yesterday now heater won't ignite. No error codes.

bo = 'Bypassed Operation'
heater is now controlled via your automation system.
Create a heat call, turn solar off if active.
Heaters should be set to auto on.

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Error code

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

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Clean heat exchanger

It needs to be removed and power washed. This is not always a DIY project, unless you have a strong back and are mechanically inclined. The heavy sooting indicates that the heater is not getting enough gas. Remember bunsen burners? Same deal, we want a blue flame (non sooting), not an orange flame. The culprit is usually an undersized gas line to the heater, or a smaller gas meter than the heater requires.

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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.

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My Haywood H250FDP heater fires up for a few seconds and goes out. After several tries I get a Low gas pressure/No gas error code. I had my propane suppier come out and check. He tried to adjust the...

the flame sensor/thermo couple can be bad and or needs cleaning --carbon build up [one day old -one year old- 20 yrs old defective or damaged parts can happen any time]

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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

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IF error ignition fault lockout

If it has not fired in some time, the odds are high that a small spider web is blocking the burner orifices. These are the brass fittings exposed at the front of the burner tray. It does not take much to block gas flow. Each burner should have a pipe cleaner run into the orifice. A small zip ties will also work. You're looking for a small web on the end of the cleaner.

The problem lies in the blockage. The ignitor and flame sensor sit at two different burners. Blockage of a burner at those locations will not ignite or will not sense flame to allow the heater to stay on.

Restart after cleaning and see what happens. Otherwise, you may have a bad ignitior.

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