ACV ACVMax Touch, Installer'S Handbook, Page: 46 / 48

Codes Description of the fault Solution for the fault
E 31
Supply 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 fi xing the problem reset the appliance and resume normal operation.
E 32
DHW 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 fi xing the problem reset the appliance and resume normal operation.
E 33
DHW 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 fi xing the problem reset the appliance and resume normal operation.
E 34 Low Voltage : Line voltage has fallen below an acceptable operating level. The appliance will automatically reset once line voltage returns to normal.
E 37 Low 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 43
Return 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 fi xing the problem, reset the appliance and resume normal operation.
E 44
Return 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 fi xing the problem, reset the appliance and resume normal operation.
E 45
Flue Sensor Shorted : A short circuit has been detected in the appliance fl ue tem-
perature sensor circuit
1. Check fl ue temperature sensor and wiring harness for a short circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume normal operation.
E 46
Flue Sensor Open : An open circuit has been detected in the appliance fl ue tem-
perature sensor circuit.
1. Check fl ue temperature sensor, connectors and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume normal operation.
E47 Water 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 fi 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 77 High temperature mixing circuit Check if the mixing valve functions correctly.
E 78 Mix 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 fi xing the problem reset the appliance and resume normal operation.
E 79 Mix-circuit sensor Open
1. Check Mix circuit temp. sensor and wiring harness for an open circuit.
2. If necessary replace the sensor, or the wire harness.
3. After fi xing the problem reset the appliance and resume normal operation.
E 80 Return > Supply : Return temperature is higher than supply temperature. Confi rm water fl ows in appliance return and out appliance supply.
E 81 Sensor Drift
: Supply and return temperatures are not equal.
1. Check water is fl owing through appliance.
2. Wait a few minutes for the water to equalise the temperature, the appliance will automatically reset once tempera-
tures become equal.
3. If appliance doesn't reset, check the NTC's and check the wire harness, replace if necessary.
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Installer's Handbook (Evo) - 660Y3000 • A
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TROUBLESHOOTING