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Hayward pool heater smoke

White smoke coming from new Hayward H400 propane pool heater. After $% minutes of running brand new heater, smoke has not stopped. Heat transfer is very good. It seems to work very well other than the somoke. Any suggestions?

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Is it smoke? Could it be steam?
If so, condensation "Rain in the inside of your new heater". This is a real problem & needs to be checked out by a Certified Heater Technical service man. Preferrably, not the one who installed.

Posted on Jan 29, 2014

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SOURCE: hayward pool heater c4205 has error message of LO

lo usually indicates insufficient water flow and/or pressure switch malfunction.make sure filter is clean and pressure is in normal range

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SOURCE: Pool heater will not ignite

My heater worked ok , btu made a clicking sound, now it shows a AO error? What can I do I dont have enough money to call a pool man again.

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SOURCE: 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.

Posted on Apr 23, 2010

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1 Answer

My Hayward H400 will not turn on


Does the heater sound like it is trying to fire? (Fan on, clicking sound). Check your filter pressure. If it is high, it may be causing the heater not to fire because the heater doesn't know the pump is running.

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My hayward heater is smoking and I can see a flame below inside the system. Is this okay? We opened the lid and front panels and only see normal debris that we cleaned out. Help please.


The flame should be blue and not yellow. If it is yellow the mixture is rich and that is usually caused by either something blocking air to one or more of the the air intake ports or the heater could be a natural gas unit and you are using propane. I hope this helps.

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My plumber needs manual for Hayward #H400 FDP


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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
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I have a hayward h400 gas heater for my inground pool. the sf button is on. where is the temperature sensor located


You should be able to find this on the manifold on the side of the heater. You can find two wires comming from the heater and they will go to a white plastic nut, when you loosten this a steel tube will slide out. Follow the wires to the circut board and unplug then replace.

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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.

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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.

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