Pool Heater

[Hamelfire]

I have an 18/54 hard side pool. We just installed a new Hayward 135k NG pool heater. It runs from a 2 hp single speed pump through a 19 in sand filter filled with glass media.
The issue I'm having is giving HS code. I checked all water valves and they are good. I then researched and tried adjusting the flow sensor? That didn't seem to help either. When it starts it runs for about a minute and the temp on the digital display says 50 degrees then climbs to about 56-57 then the heat shuts off and the fan continues to run for another minute or 2 and then HS is displayed.
The water temp is about 45 degrees if that helps.
I looking for any other ideas to fix this issue

 

[ajw22]

See page 35-36 in https://hayward-pool-assets.com/assets/documents/pools/pdf/manuals/UHSDiagnostics.pdf?fromCDN=true

HS code is telling you that the water output temp is too high. It is not a flow sensor problem it is too high water temp inside the heater.

Do you hear rattling or kettling from the water boiling in the heater?

You have a flow problem that can be algae clogging your filter causing the HS fault, high filter pressure and low flow.

Do you have a RECIRCULATE setting on your MPV? If so use it to bypass your filter and see if your heater then works.

What test kit do you have?

We confirm algae with the Overnight Chlorine Loss Test. Then rid the algae with the SLAM Process

 

[Hamelfire]

See page 35-36 in https://hayward-pool-assets.com/assets/documents/pools/pdf/manuals/UHSDiagnostics.pdf?fromCDN=true

HS code is telling you that the water output temp is too high. It is not a flow sensor problem it is too high water temp inside the heater.

Do you hear rattling or kettling from the water boiling in the heater?

You have a flow problem that can be algae clogging your filter causing the HS fault, high filter pressure and low flow.

Do you have a RECIRCULATE setting on your MPV? If so use it to bypass your filter and see if your heater then works.

What test kit do you have?

We confirm algae with the Overnight Chlorine Loss Test. Then rid the algae with the SLAM Process

I figured it out. I'm was not thinking yesterday and had my input and output backwards on the header.