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What causes new relays to fail? This is in a glass kiln.

The next time you replace a relay, examine it for heat damage. A loose push-on terminal can burn up a new relay.

A kiln technician told us about the time he replaced a relay for a customer only to be called back a short time later to the customer's house. He opened the kiln's switch box and found that the new relay had failed, too. It baffled him until he figured out that one of the push-on connectors on the end of a wire had lost its spring tension. That loose connector burned out the new relay.

The push-on connectors should be very tight. You can tighten a loose connector by squeezing with pliers, but if the connector has been damaged by heat, it will loosen again.

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