Question about Hayward H250FDN Low NOx Natural Gas Pool or Spa Heater

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Hayward H250FDN blue temperature control will not respond (MODE and RED up button are OK)

Hello brainy people! I have a Hayward H250FDN heater which the temperature controls are stuck and will not respond. I can see the pool temp (84deg) on the display, I can use the MODE button to flick between the pool and the spa temperature displays ok, but the BLUE temperature button is stuck at (102 Spa) (73 pool) and will not go down if I press them. (The UP button works just fine!) I purchased a new display, thinking it was the button that had been burned out as per other posts on here.. but sadly, exactly the same problem is occuring with the new one I just fitted. Is there a master reset button anywhere that may help me? Has anyone else experienced this issue? I'm now worried that when winter comes and the temperatures drop, if anyone turns the heater gas on... I'll have a 102 degree spa day and night! $$$$$$ HELP!!! Should I just order a new EMERSON circuit board? Any ideas helpful. Thank you.

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  • Hayward Master
  • 5,062 Answers

Up and down button at same time with either mode or enter at same time for seven seconds that should unlock

Posted on Sep 05, 2017

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Posted on Jan 02, 2017

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SOURCE: I have a Hayward HM2400 pool heater. The control

i bet you have a automatic control ? if yes the sensor is bad if not some one set the heater not to go over 96

Posted on Aug 31, 2009

  • 990 Answers

SOURCE: I have all Hayward equipment on my pool and have a

You will have a small wire comming from the main box by the equiptment that will go to the pipe between the pump and the filter. It will connect to a piece in the pipe that is held in place with a stanless steel clamp. This is the heat sensor for the control and has gone bad. It is simple to replace and farley inexpensive. That should fix you up, good luck.

Posted on Feb 14, 2010

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1 Answer

Why does my hayward h250fd have and if error code? it is a brand new heater


If the control exceeds the maximum number of ignition retries or recycles the heater will shut down and go into lockout. Automatic reset is 60 minutes.
There are a few reasons that this might be happening. They range from air in the gas line to inadequate gas flow. Start by checking the installation

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1 Answer

Is there an alternative control panel I could use for a H259FDN?


Unless you have rigged your unit for remote control, this control panel is the only one listed.
You can check this link for contact information

http://www.hayward-pool.com/prd/In-Ground-Pool-Heaters-Universal-H-Series-Low-NOx_10201_10551_14002_-1_14003__I.htm

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There is a drain plug on the inlet/outlet header.

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have gas pressure checked if ok check pressure on back side of gas valve also check connections after gas valve

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I want to go over 104 degrees


cannot just can go to calibration and cheat 4 degrees

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Header cracked on hayward pool lo nox h250fdn heater. need to replace the header. Please help?!


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1 Answer

Heater temperature control buttons


The board is bad. The part number is IDXLCPA1930. Expect about a $400 replacement cost.

Dec 04, 2008 | Pool & Spa

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