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I have 3120rl (2021) and have had 2 problems at different times with the water heater. The 1st one was the high limit switch on the 110 v side was bad. Could see the wire was burnt. Ordered the replacement from Amazon. Changed out and all was good. 2nd problem was wire from high limit switch to heating element had shorted out due to rubbing against sharp metal by high limit switch. Replaced and all was back to hot water
Hope this helps!
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