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I believe I beleive that is the original key pad, but i only inherited the system from the old owner. I did not test the old temp sensor, but figured at $25, and buying from the Pentair Store on amazon, it would be authentic and it was easier just to replace it. I will try the 10K resistor...

The heater appears to be working fine, all set points, etc are working correctly when the heater is running and the temperature displayed in the phone based app or on the remote panel in the house always seems to be correct. However the RED LED read out on the panel sometimes will be correct and...

thanks for your help. I hooked up the wire between the heat manifold and into the control box. Hopefully that does it. It is an intermittent problem, so i wont know if it is fixed for a while. I will give a final update in a couple weeks unless it fails earlier. THANKS FOR EVERYONES HELP!!

thanks, i just starting reading the PDF's refered to above, and it talked about the Fenwal. I will let you know what i find

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I am not a pool guy, but have a lot of knoledge of home heating systems. I have a Pentair MasterTemp 400 heater that sometimes fails to start up properly. The process is you can hear it start up, the blower motor turns on, the gas valve clicks open, the heater lights (you can feel hot air out...