Out of service after 1 season. Examination of the inner braided copper wire showed noticeable discoloration at the junction of the bimetallic strip. The normal current draw from the AC line was 29A, so this error was probably caused by a high resistance at this connection point. The current path on side A was measured at 0.5 ohms while the other was about 2.5 ohms, so I concluded that the bimetal connection with the braided wire on side B was failing. I installed a new UBIF260N, I hope this one lasts longer.
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