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Could be an arc is being created in the first relay points from the coil in the second relay, is this being switched a lot? Could try a small varister to ground to help the voltage bypass the relay. If that is what is happening. If you just touch the wire to ground to turn on the second relay and pull it away does it arc?
Edit, your last post just arrived in, so you are burning out the temp sensor contacts? If so same load related problem.
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Last edited by 908/930; 04-30-2024 at 01:43 PM..
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