W1209

W1209 LLL

  • W1209 “LLL” Error

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    W1209

    The error code “LLL” on the W1209 thermostat controller typically indicates that the measured temperature has fallen below the lowest temperature limit of the thermostat’s measuring range. It serves as a safety feature to protect the equipment or system being controlled by the thermostat. What you can do with the […]

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