Important Installer's Note - Robertshaw 300-224 Installation And Programming Instructions

IMPORTANT INSTALLER'S NOTE FOR THE 300-224
This thermostat is equipped with a transformer wiring fault indicator (located along the top left
side of the thermostat).
If the red light is ON when the wiring is complete, you must check the equipment to ensure that
the transformers are wired in accordance with the diagrams provided on this sheet.
Note: Continued operation of the thermostat with the red light ON will damage the thermostat.
SINGLE TRANSFORMER
If the fault indicator is ON, the transformer exceeds the allowed 30 VAC.
Replace the transformer.
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