Question about Hayward 250kbtu Ng Pool Heater - Inground

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When I turn on my pool ,the heater wont turn on.

When I turn on my pool the heater wont turn on, it flashes SF and HS and the service light is on. Prior to this happening I was unable to switch from standby mode or pool or spa mode.What can I do about this?

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  • Anonymous Mar 15, 2014

    Mode button will not move from spa to pool, not other indicator or warnings are shown

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  • 246 Answers

Clean the filter turn breakers off for twenty secons

Posted on Sep 11, 2009

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5 f code after hearing poping noises filter and pump are new


SF (not 5F) = Temperature Sensor or Thermistor
HS = High Limit Sensor
Heaters Set Temperature out of Sync with actual Water Temperature.
Heaters Maximum Water Temperature has been Exceeded.
A few reasons this occurs...
  • Low water flow thru heater, check :
    • Dirty Filter
    • Opened By Pass Valves
    • Plugged pump impeller
    • Dirty/Full baskets at skimmer or pump
    • Anything that may reduce water flow
  • Sensor could actually be doing its job, in a different aspect, Thermostat failure, and water is overheating in spa or pool?
But anyway, your heaters fault code you asked about does not necessarily mean the sensor failed, but is only informing of a problem.

Jun 07, 2015 | Hayward Pool & Spa

1 Answer

My Hayward H400FD is showing a H5 or HS error code, what does this mean, and what do i need to replace?


HS represents a problem with the temperature being too high. (maximum return water temp exceeded). this can be caused by a restriction in the plumbing system. i have that problem when i start my pool after a cold night. the water temperature rises too fast and the heater protects itself by flashing that code and turning off. reset the power to unit and it should work ok. if not, you may have to dig deeper as to why this code is being generated

Oct 02, 2014 | Hayward Pool & Spa

2 Answers

What if code sf and h5 comes up


The two may be related? If the right problems are present...
HS = High Limit Sensor
SF = Temperature Sensor or Thermistor
Heaters Maximum Water Temperature has been Exceeded.
Heaters Set temperature not in line with actual water temperature.

A few reasons this occurs...
  • Low water flow thru heater, check :
    • Dirty Filter
    • Opened By Pass Valves
    • Plugged pump impeller
    • Dirty/Full baskets at skimmer or pump
    • Anything that may reduce water flow
  • Sensor could actually be doing its job, in a different aspect, Thermostat failure, and water is overheating in spa or pool?
But anyway, your heaters fault code you asked about is does not necessarily mean they failed. They are informing of a problem.

May 25, 2014 | Hayward H-series Electronic Gas Pool...

1 Answer

Laars pool heater wont start.


check safety circuit starting with pressure switch if voltage on both sides ok if not check pressure switch if ok check copper tubing it gets clogged at header

Mar 27, 2013 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

I have a Pentair minimax 250k electronic. Opened pool today and when I turned power on to the heater, it won't get through startup sequence. Dashed lines flash, then 888 and service light comes on. ...


Most of the time I have found the problem to be the thermistor. It is located on the water manifold of the heater. Usually the panel lights, flashes then to 888 and back to dashed lines. SW light is green, and service light is red. It costs 25 to 45 dollars, and takes 5 minutes to repair. New thermistor looks identical to old so replacing it is very easy.
thanks please let me know if this was helpful

May 21, 2011 | Pentair Minimax NT Heater

1 Answer

Haywood heater has code sf what does that mean


SF is a thermistor error. Once the heater cools down it should reset itself. If not, call a service tech.

Jul 03, 2010 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

I have sf and hs messagen o my hearter h series.


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Apr 27, 2010 | Hayward H-Series 200k BTU Millivolt Heater...

1 Answer

Hayward H300 Spa Heater will not fire up


try to replace the thermo sensor it is located on the left side of tghe unit and has 3 wires running to it.

Mar 05, 2009 | Hayward H Series Pool & Spa Heater 400k...

1 Answer

Service light on


I just had the same problem resolved, my mastertemp 400 would run up the temp to 82F and then cutoff, the service light flashes and then 50 seconds later the heater would restart and run for 2 minnutesbefore shutting down again and relighting in 50 seconds. Repeating until the temp setting is reached.

I had the pool guy out 3 times until he found a bad thermal regulator valve (kit #77707-0010). Once replaced the heater runs great.

He told me that it's my pool chemestry that is to blame, I had it checked (like I do weekely by me and monthly by the pool supply store) and it perfect??? I'm now questioning what caused the corroson and stop it from coming back?

I hope tis helps.

Jan 17, 2009 | Pentair Mastertemp Pool & Spa Heater Dual...

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