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I think I figured out the problem. It appears the new control board has the pool and spa max temps reversed. I moved the pool max temp from 78 to 104 and voila, all seems to be working well. I guess this is to be expected when the OEM board is no longer available.

1. 79 2. 100 3. 79 4. 104 5. 81 Stack flue sensor displays 328 Sometimes when the temp goes below 79 the heater will kick back on and run to 79. Other times I get an E05 error code.

We have the easy touch remote.

Heater seems to run perfectly until the water temp reaches 79 degrees. Then it shuts off. I am not finding any soot or corrosion on anything.

Yes. Maybe I missed something but everything in the document seems to be checking out ok. Odd that the heater runs fine until the water temp hits 78 degrees. I even switched to heating the pool for a couple hours and the heater kept going with out any problems.

Suggestion on what to look for beyond flue sensor?

Yes there was a rodent in the heater at some point. However I have not found and damage or nesting.

I spoke too soon. Spa heater to 77 degrees then gives a E05 error. Replace Flue sensor?

Thanks everyone. After replacing the bypass valve the problem still existed. I doubled checked the voltage on pressure switch. Final result. Control was bad. Just replaced it and all is working great just in time for the big Texas snowstorm!

Thank you for the suggestion. Thermal regulator tested as good. However I did find the bypass valve stem floating around when I removed the thermal regulator. I ordered a new bypass valve kit. Hopefully that will solve the problems.

My Pentair master temp 400 heater will not turn on. If first started by cycling on and off frequently and now the service system light is on. The PS led on the board is also on. I have checked the Pressure switch and even jumped it out and the PS light will not turn off. Flow rate is good...