Have a Pentair Mastertemp 400 that the buttons don’t seem to do anything. When I power the pump on the display flashes 128 then r=C then goes blank. All the lights above the buttons light up to when power is initially turned on but none of the buttons work. Where do I start?
Hi,
Could you take a look for the exact model # and serial # of your Pentair heater, this should be listed on a nameplate label somwhere on the heater (i.e. inside the service panel, near the control panel on the side of the unit, etc…) Please post that information back to this thread so we can further assist.
P/N 460736
HTR 400 MASTERTEMP NA
SERIAL NO. 11170841100593
It’s a Pentair Mastertemp 400 that doesn’t respond to a button press of the keypad when the pool pump is powered on. What do I need to fix it?
Hi Thanks for the information. You have this heater here Pentair MasterTemp 460736 Parts Diagram we would suggest replacing with this MasterTemp Control Board Key #15 and this Membrane Pad Replacement Key #18 You could try just replacing Key #15 and if that doesn’t do the trick then also replace key #18.
Hi Thanks for the information. You have this heater here Pentair MasterTemp 460736 Parts Diagram we would suggest replacing with this MasterTemp Control Board Key #15 and this Membrane Pad Replacement Key #18 You could try just replacing Key #15 and if that doesn’t do the trick then also replace key #18.
Replaced control board #15 didn’t solve the problem and it was expensive. Waiting on membrane pad to arrive. My gut tells me that something else may be the problem but not sure.
I don’t want to pour a ton of money into something that isn’t going to work. Any ideas?
Doesn’t seem to respond to any button pushes on the keypad. Used to hear it ignite when I pressed a button, but now I hear nothing.
The LCD screen lights up and when I press the yellow button on the back of the control panel seems like it goes through a process where pool on and spa on lights light up and the LCD is on, but nothing further ever happens.