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Discussion Starter · #1 ·
I got a service call to check out a hot water tank that was blowing fuses.
Customer had had water heater recently changed due to blowing fuses high limit trips. Before I got there he had replaced the thermostat and high limit control on the new water heater, because the new water heater was also blowing fuses and tripping the high limit.
I replaced a fusible disconnect at water heater location with a 60a pullout disconnect. I did this because the fuses and bus in the old disconnect showed heat damage. Tested resistance on elements 18 ohms each, current when heating 13a, voltage 240v. So I left thinking all good. It’s still tripping the high limit once or twice a day. Any point in replacing that thermostat high limit again? What makes them trip anyway? Is it just an overcurrent tripping on heat?
 
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