Raypak gas heater sensor failure- was working ok - now this error

Welcome to TFP.

It says more. Which sensor?

What model Raypak heater?

Check your filter pressure and water flow. Make sure algae has not clogged your filter and refuced your flow.
 
Please create your signature with details of your pool and equipment. We need to know what equipment yiu have to help you.

What filter do you have?

If you do not know then post pics of your equipment and we will help you.
 
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