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What does it mean if my 3iE thermostat reads “overload” on this display?

The overload message will occur if more than 16 AMPS has been connected to the thermostat. A second thermostat or a contactor (relay) will be required to handle more than 16 AMPS.

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What does it mean if my 3iE thermostat reads “overload” on this display?

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