Question about Pentair Minimax NT Heater

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The thermal fuse in my Raypak 105B pool heater keeps blowing.

Any suggestions on why the fuse would blow again after 1 days use?

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The thermal fuse react to rollout flames from the burner. Whatever caused your first one to fail caused the second and will continue to be a problem until fixed.

You could have a clogged up heat exchanger from soot and/or debris. You can also have problems with clogged burner tubes.

Finally, you could simply have wind issues that would require a high wind stack being installed on the heater to correct.

Posted on Jul 26, 2009

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