CodesDescription of the faultSolution for the fault
E 25Internal Control Fault: CRC check error. Turn unit o and on to resume normal operation.
E 30Supply Sensor Shorted: A short circuit has been detected in the appliance supply
temperature sensor circuit
1. Check supply temperature sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem, reset the appliance and resume normal operation.
E 31Supply Sensor Open: An open circuit has been detected in the appliance supply
temperature sensor circuit
1. Check supply temperature sensor, connectors and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 32DHW Sensor Shorted: A short circuit has been detected in the DHW temperature
sensor circuit
1. Check DHW temperature sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 33DHW Sensor Open: An open circuit has been detected in the DHW temperature
sensor circuit
1. Check DHW temperature sensor, connectors and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 34Low Voltage: Line voltage has fallen below an acceptable operating level.The appliance will automatically reset once line voltage returns to normal.
E 37Low Water: Water level has fallen below 0.7 bar.1. Increase pressure to normal range.
2. The appliance will automatically reset once water level returns to normal.
E 43Return Sensor Shorted: A short circuit has been detected in the appliance return
temperature sensor circuit.
1. Check return temperature sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem, reset the appliance and resume normal operation.
E 44Return Sensor Open: An open circuit has been detected in the appliance return
temperature sensor circuit.
1. Check return temperature sensor, connectors and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem, reset the appliance and resume normal operation.
E 45Flue Sensor Shorted: A short circuit has been detected in the appliance ue tem-
perature sensor circuit
1. Check ue temperature sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 46Flue Sensor Open: An open circuit has been detected in the appliance ue tem-
perature sensor circuit.
1. Check ue temperature sensor, connectors and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E47Water pressure sensor error: Water pressure sensor is disconnected or broken
1. Check water pressure sensor, connectors and wiring harness.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 76
Gas pressure switch open
1. Check both the static and the dynamic gas pressures.
2. Correct condition which caused the pressure switch to open
3. Appliance will automatically reset once the pressure switch is closed.
External Limit Open: An external automatic reset appliance limit has opened.1. Correct condition which caused limit to open.
2. Appliance will automatically reset once external limit closes
E 77High temperature mixing circuitCheck if the mixing valve functions correctly.
E 78Mix circuit sensor shorted
1. Check Mix circuit temp. sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
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