Temp Displaying 1 would fire for about 3-5 mins and then displays E01 error code


New member
Dec 30, 2019
Roanoke, Tx
I have a Pentair 400 Heater that Temp Displaying the number 1 after it would kick on and the afte about 3-5 mins and it then displays E01 error code and then shuts off. I recently replaced the Thermistor and also the Automatic Gas Shutoff Switch. I was going to purchase a Thermal Regulator to see if this solves the problem. Any recommendations as I am new to owning a pool.


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Welcome to TFP.

This post implies you may have a bad control board...

I suspect that you're going to need:
42002-0007S Control Board and
472610Z Membrane Pad.