Question about Pentair Minimax NT Heater

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Minimax NT error code E03 which indicates an open circuit at the fusible link. Q; where is the fusible link located? What would cause the link to overload? You are appreciated!!

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adam hudson

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The fusible link is the small skinny part in the center front of the cabinet behind the main access panel. It is 4" long, skinny and black. There are two wires. one going in, and one going out.
This part fails when there is a flame rollout. A flame rollout can be caused by many, many things and will take some digging to figure out. Some of the things that can cause this are:

1. Incorrect venting.
2. Incorrect gas pressure, or gas valve calibrated incorrectly.
3. Blockage in the venting.
4. Spider webs in gas manifold.
5. Leaking heat exchanger
6. soot build up on the burner tray.
7. soot build up on the heat exchanger
8. cracked or broken refractory kit.

Long story short, there is no easy answer to this problem. The fusible link is very cheap and easy for any person to replace. But the heater must be monitered afterward, and if you see ANYTHING out of the ordianry, I highly suggest a proffessionals help in the form of a service call.

The part number for the link is: 075173
It may be found on any online pool parts store. You should purchase 2 just in case it trips the link again immediately.

Posted on Jul 19, 2011

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