Pentair mastertemp 400 heating issue

JustAquestion

New member
Nov 13, 2020
1
Florida
Hello! My heater reads 80 on the control pad. When I press temp up it changes to 65 and won’t go up or down. No other lights are on other than pool heater. Any ideas how to raise the temp?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
22,093
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Welcome to TFP.

Have you opened up the heater and checked that no critters have nested in it or chewed on any wires?

The membrane keypad sometimes fails and is separately replaceable with Pentair part number 472610Z.