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If sensor wiring is correct, replace the sensor. A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide Page 23 Johnson Penn A421 Series Pdf User Manuals. View online or download Penn A421 Series Installation Manual. A421 Control Wiring Terminals and Wire Size Information. Each A421 Control includes a Johnson Controls/. PENN® A99 Series temperature sensor. See A99. Series Temperature Sensors, Wiring, and Technical. Specifications The A421 controls provide heating or cooling control, sensor offset, temperature setback, adjustable anti-short cycle delay, and a restricted user A421 control models have simple On and Off temperature settings for heating or cooling, an adjustable anti-short cycle delay, temperature setback, and sensor Control equipment's temperature, pressure and air flow with dependable PENN® control products. Rely on precision engineering, heavy-duty construction,