31 PB
TROUBLESHOOTING
Control Diagnostic Modes
Control Diagnostic Modes
Diagnostic Description LED 1 LED 2 Solution
Control Fault (No Power) Off Off Confirm incoming voltage, if present replace the board.
Normal Operation Flash Flash Normal operation.
Anti-Short Cycle Delay Alternating
Flash
Wait for shot cycle delay to expire. Approximately 3-minutes.
Coil Sensor Failure On On 1. An open or shorted sensor is detected.
2 .Confirm connection points.
3. Ohm out sensor to confirm if open (OL) or shorted (0.0 Ohms). If ok replace the board.
Refer to Appendix 1 (Thermistor resistor values).
Ambient Sensor Failure Off On 1. An open or shorted sensor is detected.
2. Confirm connection points.
3 .Ohm out sensor to confirm if open (OL or shorted (0.0 Ohms). If ok replace the board.
Refer to Appendix 1 (Thermistor resistor values).
Low Pressure Switch Open On Flash 1. Possible faulty pressure switch.
2. Confirm connection points.
3 .Suction line pressure is too low. Confirm system pressures and operation, address as
needed.
4 .In cooling possible indoor blower not running.
Low Pressure Switch
Lockout
Off Flash 1. Possible faulty pressure switch.
2. Confirm connection points.
3 .Suction line pressure is too low. Confirm system pressures and operation, address as
needed.
4 .In cooling possible indoor blower not running.
High Pressure Switch Open Flash On 1. Possible faulty pressure switch.
2 .Confirm connection points.
3 .Discharge pressure too high. Confirm system pressures and operation, address as
needed.
4 .In cooling possible outdoor condensing fan motor not running.
High Pressure Switch
Lockout
Flash Off 1. Possible faulty pressure switch.
2 .Confirm connection points.
3 .Discharge pressure too high. Confirm system pressures and operation, address as
needed.
4 .In cooling possible outdoor condensing fan motor not running.
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