Just opened pool and turned on breakers to Hayward HP21104T Titanium Heat Exchanger and display panel wont light up . Appears to be getting no power but everything else in pool shed is working. What’s your best guess as to the issue? Electrician or Repairman? Estimated Ballpark Cost?
I would assume that the heater has its own cicuit breaker. Check for power to breakers then check for power to the heater. Heater may also have internal fuse.
One more thing. Heater should be on GFI. Check reset botton/switch.