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

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Hayward H300 Spa Heater will not fire up

I have a Hayward H300 spa heater that will not fire. I get an error code of SF and HS. I just had this serviced 2-3 months ago and it worked fine twice. Any ideas on how to fix this? Thanks!

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  • Anonymous Mar 19, 2014

    got spark and the gas is on,it fired up once then thur a ILC code

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

Posted on Jun 13, 2009

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What does this mean Hayward pool heater h150FDN gives us an hs or h5 error?


HS = High Limit Sensor
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 is: hs, not h5

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CODE SF CURRENTLY DISPLAYED ON LED / CLEANED 2 SENSORS ON EXTERNAL PLUMBING,SAME CODE. LOOKING FOR LOCATION OF TEMP.SENSOR?


The code SF indicates there is either a bad temperature sensor or the input to heater is faulty. I would buy a temperature sensor from a pool supply suppilier and install it. That solution has a very high likelihood of being successful. If you have a few tools and a little mechanical ability installation should be easy. I hope this helps

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Your internal by-pass could be stuck open or the disc could be worn to the point of letting water pass too fast. Or your thermal control valve could be stuck open. These are both found in your water header going into the heater. Hope this helps, good luck.

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