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My Hayward h400fdn is locked out on code 10 combustion fan comes on for a couple of seconds ?

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Michael Prior

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You may be looking at replacing one or both boards. Make sure the air flow is not blocked and there is no damage to any of the wiring. The igniter is Error code-10 however if the igniter is good then the board will be the issue.

Posted on Jun 12, 2017

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Hs error code what does it mean?


Water Temperature Sensing Error

A) Inlet water temperature sensor is reporting a temperature in excess of 104 degrees. Normal operation resumes 2 minutes after inlet water temperature sensor reports temperatures of 104 degrees or less. This error functions in both normal and remote thermostat modes.
or

B) Inlet water temperature sensor is reporting a temperature change at a rate faster than 6 degrees in 60 seconds, indicating a potentially damaging low water flow condition. Normal operation resumes when temperatures stabilize. If this condition is detected 3 times, the heater will lock-out until the electrical power is cycled off and back on.

Jun 19, 2014 | Hayward H400FDN Low NOx Natural Gas Pool...

1 Answer

Hayward H400FDN will not stay lit - Brand New install - NO Fault codes.


make sure wiring is correct especially if wired 120 volt read instructions inside panel

Jan 28, 2014 | Hayward Industrial Products H400FDN...

1 Answer

H400FDN... Lights... burns for 5 secs... turns off... repeats...


Pull your heat tray and clean burners and check for rat nests. A common cause of this is spider webs in the gas orfaces on the supply pipe. If you remove the brass orfaces they may have small,small,small tiny webs inside them oyu can blow out or clear with a toothpic. they dirvet the gas from the main burner (the one with the ignitor) as the gas builds it will poof and start but then the other burners that have gas flow won't be close enough to let the ignitor read flame so it will cycle just like you describe. My kingdom for a toothpic. I have made a tool to do this out of a stripped wire bent just so with the end roughed up to catch the webs so I didn't have to pull the tray on heaters with this proble. You should pull the tray and see the whole problem to understand it better.. I hope this helps and good luck.

Oct 02, 2009 | Hayward H Series Pool & Spa Heater 400k...

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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.

May 28, 2009 | Hayward H Series Pool & Spa Heater 400k...

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