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  1. R

    Pentair Mastertemp 400 Electrical Issues

    Another update! I replaced the aftermarket control board with the legit pentair 6 button control board. The heater works and the pool is 85 degrees and ready for our first pool party tomorrow! I can't thank you guys enough, you saved me thousands of dollars. I still have one question. I bought...
  2. R

    Pentair Mastertemp 400 Electrical Issues

    I got the new (aftermarket) control board in today. Good news the heater now turns on and the fuse is not blowing. Bad news is after running the startup cycle a few times the heater never fires. Fenwal is showing ignition lockout. Ignitor tested at 93.2 and the airflow switch goes from OL to...
  3. R

    Pentair Mastertemp 400 Electrical Issues

    Can I use a 1.5amp fuse in the fireman's switch? These 1.25's are so hard to find, and expensive
  4. R

    Pentair Mastertemp 400 Electrical Issues

    Sorry didn't see this yesterday. I looked all over the control board and did not see anything obvious. Not sure how to check the membrane pad, it's a sticker right?
  5. R

    Pentair Mastertemp 400 Electrical Issues

    Little update if anyone still cares. New Fenwal went in this evening, same problem. The only time the fuse does not blow is if the lines from the fireman's switch are unplugged from the control board (J7?) I tested the wires on that and they all test fine except that they are actually quite...
  6. R

    Pentair Mastertemp 400 Electrical Issues

    Is this what would happen if the heater was wired for 120v and it got plugged into 240v? Just wondering if maybe that happened with the previous owner or the pool guy who originally wired mine. If that's the case what else would need to be replaced? Everything on the 24v system? Ordered a...
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    IMG_1650.jpeg

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    IMG_1651.jpeg

  9. R

    Pentair Mastertemp 400 Electrical Issues

    Sorry guys, Had to do some real work around the house. I got the Fenwal board off this morning. Is this what you mean by burn traces? Doesn't look good
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    IMG_1649.jpg

  11. R

    Pentair Mastertemp 400 Electrical Issues

    I will check it tomorrow. Thank you
  12. R

    Pentair Mastertemp 400 Electrical Issues

    The wires are all OL. The pin furthest to the right is 11.65 the other 3 are 0.02
  13. R

    Pentair Mastertemp 400 Electrical Issues

    Unplugged and replugged every wire in that thing. The only 2 wires that changed the continuity were the pins on the control board that you had me check and the harness to the left of that
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    1714185140034.png

  15. R

    Pentair Mastertemp 400 Electrical Issues

    So unplug a harness and then recheck continuity at the fireman's switch? Sorry, I really have no experience with this. What am i looking for when it's the right wire? And thank you again, I can't believe how kind you are. Not sure if you could tell but we are strapped for cash (buying a used...
  16. R

    Pentair Mastertemp 400 Electrical Issues

    Fuse in .001
  17. R

    Pentair Mastertemp 400 Electrical Issues

    With a fuse in or out?
  18. R

    Pentair Mastertemp 400 Electrical Issues

    One last thing that i noticed, the red light on the fenwal comes on for a split second before the fuse blows.
  19. R

    Pentair Mastertemp 400 Electrical Issues

    Can't find a damaged wire anywhere. Amazon has a new board for $100 maybe its worth trying and if it doesn't work I can just send it back
  20. R

    Pentair Mastertemp 400 Electrical Issues

    Thank you for all of your help James. The board looks clean to me, nothing obvious.
  21. R

    Pentair Mastertemp 400 Electrical Issues

    Getting OL when measuring between those 2 pins
  22. R

    Pentair Mastertemp 400 Electrical Issues

    Across the terminals where the fuse sits
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    IMG_1640.jpeg

  24. R

    Pentair Mastertemp 400 Electrical Issues

    27.2 from top terminal to ground. .2 from bottom terminal to ground 24 across terminals
  25. R

    Pentair Mastertemp 400 Electrical Issues

    You are totally right! It reads zero when they are connected. 120v from red to black. Sorry guys I'm no electrician. Any other ideas on why the fuse is blowing?
  26. R

    Pentair Mastertemp 400 Electrical Issues

    A pool professional did all the wiring for the pool equipment, we just never tested the heater because I had not ran gas yet. Looks like the black wire is coming from the pump relay and the white is tied in with all the common wires going back to my panel at the house.
  27. R

    Pentair Mastertemp 400 Electrical Issues

    The voltage between black and white lines is 120v. I tried the 240v plug and same thing. I even tested the heater on a completely different 120v circuit. The red neutral wire is reading 120 with a multimeter when i disconnect it from the supply (white) line. The guy I bought it from said it was...
  28. R

    Pentair Mastertemp 400 Electrical Issues

    The neutral red wire is reading 120v at the connection point
  29. R

    Pentair Mastertemp 400 Electrical Issues

    Thanks James, The power supply is 120v coming from a circuit in my easytouch panel. I have the 120v connection plug installed. The problem is that the red wire which should be the neutral wire is getting power from somewhere and sending it back to all my common (white) wires in the panel and...