Pentair MasterTemp 400 Max Temp not retaining temp

Matty7978

New member
Dec 12, 2020
3
Ventura CA
Surface
Plaster
Chlorine
Liquid Chlorine
Hi,
My Heater is not retaining the max temp set by using the manually controls in the control panel.
Generally, I’d fire up the heater using the iAquaLink contoller which would fire up the heater, heating to the max temp set. Now, I have to manually adjust the temp on the heater after using the iAquaLink app. My observation the heater keeps on defaulting back to manufactuer max heat temp of 70 degrees. Help would be appreciated
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
23,630
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Welcome to TFP.

Is your heater powered through a relay and the Aqualink turning off power to the heater? The heater should be connected to continuous power.
 

Matty7978

New member
Dec 12, 2020
3
Ventura CA
Surface
Plaster
Chlorine
Liquid Chlorine
Thank you, yes I can turn the heater on or off with the iAquaLink. I can also put it into manual mode and adjust the best accordingly.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
23,630
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Thank you, yes I can turn the heater on or off with the iAquaLink. I can also put it into manual mode and adjust the best accordingly.

Turning the heater off with the Heat button just opens the Firemans switch and should not turn power off.

If the heater power is wired into the LOAD side of the Filter/Pump relay and turns off when the pump is turned off then it is wired wrong.
 

Matty7978

New member
Dec 12, 2020
3
Ventura CA
Surface
Plaster
Chlorine
Liquid Chlorine
Sorry I may be putting us down the wrong path, it worked before just fine, so I don’t think it is a wiring issue. It may be a power was shut off issue which caused the temp setting to go back to default, and I don’t know how to set it.
 
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