Pentair Mastertemp 400-Blank Screen-No Power

Mustang33

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Brand New Pentair masterTemp 400 heater. After recent big Texas freeze, power was cut off for 3 days. Can’t remember if I had power to Heater once power came back, but don’t believe so. Replaced Basic Manifold to get pool back up and running. But no power at all to heater control panel. All breakers are fine and reset. Any suggestions on how to get power back to the heater so it can run again? Thanks in advance.
 

Rocket J Squirrel

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There is a glass fuse inside the heater. I believe it is 1.25 amp fast blow. You'll want to open up the heater and check that fuse.
 

Jimrahbe

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Jul 7, 2014
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Did you use a voltmeter and actually test the power going into the heater?

Just because the breakers "look" good, does not mean they are good.

That said, I think the Squirrel has most likely pointed you to the problem..

Thanks,

Jim R.
 

Mustang33

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Just checked the glass fuse and it doesn’t appear to be blown.
 

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Mustang33

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Just checked the power coming into the heater and it’s reading hot.
 

ajw22

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How new is new on the heater?

Who installed it? Did it ever work?

Check the proper AC voltage plug is installed.

1616264077492.png
 

Mustang33

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Should the voltage meter be getting a hot reading when testing the fuse....because it’s not.
 

ajw22

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You have no signature with your equipment.

Is the heater connected to automation?

Is the fireman's switch properly connected?
 

Mustang33

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Heaters only a few months old. It did work previous to the winter freeze/power loss. The correct 240v plug is plugged in and has never been changed or altered. The company who installed it has been doing it for years....just can’t get him on the phone to go over it.
 

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ajw22

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Should the voltage meter be getting a hot reading when testing the fuse....because it’s not.

The fuse is for the fireman's switch 24V AC. The fireman's switch needs to be closed for the fuse to have 24V AC.

1616264372803.png
 

JamesW

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Mar 2, 2011
25,897
Brand New Pentair masterTemp 400 heater.
Did this ever work at all?

Note: Don't do anything with the voltage plug until you are 100% sure exactly what you're doing.

If you install the wrong plug, you will damage the heater.
 

Mustang33

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You have no signature with your equipment.

Is the heater connected to automation?

Is the fireman's switch properly connected?
I apologize and wish I knew this basic electrical language, but I don’t.
signature? Automation? I couldn’t tell you if it was correctly connected or not. All I can do is send pics and ask generic questions.
Testing voltage line to line....I’m clueless.
 

ajw22

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I think your ET or IntelliCenter or whatever you have is not calling for heat and closing the fireman's switch or the 2 wire connection has a problem.

Pentair_MasterTemp_Firemans_Switch.jpg
 

Mustang33

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Did this ever work at all?

Note: Don't do anything with the voltage plug until you are 100% sure exactly what you're doing.

If you install the wrong plug, you will damage the heater.
Roger that.
 

ajw22

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I apologize and wish I knew this basic electrical language, but I don’t.
signature? Automation? I couldn’t tell you if it was correctly connected or not. All I can do is send pics and ask generic questions.
Testing voltage line to line....I’m clueless.

So let's slow down...

It is helpful to all of us to know what equipment you have in your pool. The best way is to create your signature with details of your pool and equipment.

What Pentair control system do you have? That is your automation - EasyTouch? IntelliTouch? IntelliCenter?
 

ajw22

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Show us a picture of your heater electrical area like what is in post #14.
 

Mustang33

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I think your ET or IntelliCenter or whatever you have is not calling for heat and closing the fireman's switch or the 2 wire connection has a problem.

Pentair_MasterTemp_Firemans_Switch.jpg
Would I be able to visually see if either one of those problems is the cause?
Not that this helps....but this is what I’m looking at..... image.jpg
 

ajw22

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I think the two wires in the black cable that disappears into the upper right of the pic are the "fireman's switch" control cable. The two wires connect into the orange and blue wire nuts in the heater.


Can you follow that black cable out of the heater into where it goes?
 

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