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Posted on Jul 05, 2010
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Our Hayward gas heater keeps giving us a H5 error code and then shuts off. What does this mean?

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  • Posted on Jul 05, 2010
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Could the Error code be HS? That is high temperature limit. Perhaps you' don't have enough flow, allowing the heater to heat the water to a temperature higher, than the thermostat setting. Make sure your bypass valve is closed, allowing full flow through the heater. Check your filter pressure differential , and skimmer baskets.
You didn't give your model number, and there are many models. You can go the Hayward website below and select your exact model number and download the manual. The manual will explain each error code.
http://www.haywardnet.com/inground/products/manuals.cfm

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  • Posted on May 28, 2022
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Started up my heater this season and got the H5 code, it turned out it was my bypass valve that I hadn't closed yet. Thanks for the suggestion!!

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My heater is an H350fdn

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Related Questions:

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Hayward pool heater. What does Service Code 56 indicate?
...on then goes to service and shows 56 Bo means bypass operation which means the heater is being controlled by an outside control.

hayward pool heater service code Questions & Answers (with ...

https://www.fixya.com > Forum > Tags

and also

https://www.troublefreepool.com/threads/hayward-h150fdn-heater-error-code-56-or-sb-and-resetting-itself.213240/

Make model manual. Should give you trouble codes although they seem to use Letter codes.

https://www.hayward-pool.com/assets/documents/pools/pdf/manuals/UniversalH-seriesLowNOx-HxxxFDOwners.pdf

..
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Jul 25, 2021 • Pool & Spa
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We a "service" message on our Hayward gas heater h250fnd also error message HS or H5
the code is HS. it means that the maximum allowed temperature has been reached too fast. there are a few situations that may cause this. restricted flow is the most common
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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
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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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