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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 Volt Transformer Diagnosing
To verify Low Volt Transformer operation, AC
Volts may be checked on the Remote Thermostat
Connector J401 pins 1 - 7. 24 VAC is normal.
To diagnose the low volt transformer, check for 24
VAC on connector J401.
Low Voltage Transformer
Low Volt Transformer
Pin 1
Pin 7