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The low voltage transformer is mounted to the
control board. If the Low Volt Transformer has
failed, the main control will need to be replaced.
Low Voltage Transformer
Low Volt Transformer
Diagnosing Low Volt Transformer
To verify Low Volt Transformer operation, AC
Volts may be checked on the Remote Thermostat
Connector J401 pins 1 - 7. 24 VAC is normal.
Pin 1
Pin 7
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