Pentair Mastertemp 300 Error and then no power

jawathehutt

New member
Apr 10, 2023
4
Maryland
Good evening,

I opened my pool yesterday and everything seemed fine. Today I went out and saw that my heater had two lights on, one for "Heating" and one for "Service System Light." The screen showed "888." Prior to this, I had not turned the heat on myself, aside from briefly at pool opening, which worked.

Nothing I did changed anything, including letting the pump run on full.

Eventually I gave up and just turned off the heater breaker for 10 seconds and turned it back on. Now it's totally blank, doesn't respond to anything, seemingly no power.

Is it time to call the pool company or an electrician? Any recommendations for diy?
 
Service System means that the Pressure Switch is open. Either a low pressure/flow or a bad pressure switch.

What is your filter PSI?

Clean your filter and increase your pump speed.

Your filter probably loaded up with the initial filtering after opening.

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