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Old 03-23-2020, 07:17 AM
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Pete VanderLaan Pete VanderLaan is offline
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Join Date: Apr 2002
Location: Chocorua New Hampshire
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I've never seen an MDR fail at "On" either but I have seen them fail in that they shut down in the on position and close, never achieving the temperature needed for the program. It's the solenoid that gave the trouble, not the mercury portion.

Mechanical relays indeed will fail at on.

Safety issues on an MDR would not keep me up at night.
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