CodesDescription of the faultSolution for the fault
E 79Mix-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 xing the problem reset the appliance and resume normal operation.
E 80Return > Supply: Return temperature is higher than supply temperature. Conrm water ows in appliance return and out appliance supply.
E 81Sensor Drift: Supply and return temperatures are not equal.
1. Check water is 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.
E 85Pump operation: warning - Appliance pump is running out of limits.Pump is running out of its limits. Check pump for blockage and obstructions, replace if neccessary
E 86Pump hard fault: Pump FailurePump Failure, check if pump PWM-feedback wire is properly connected, replace pump when neccessary
E 87External Limit Open: An external appliance limit has opened.1. Correct condition which caused limit to open, then reset appliance.
2. The appliance needs to be reset once external limit closes.
E 89Incorrect Setting: A parameter setting is outside the settings range. 1. Review CH & DHW settings and correct as necessary.
2. The appliance will automatically reset once corrected.
E 90Firmware Mismatch: Control module and display rmware versions are incompat-
ible.One or several components are not compatible with the system. Replace mismatched component(s).
E 91System Sensor Shorted: A short circuit has been detected in the system tempera-
ture sensor circuit
1. Check system temperature sensor and wiring 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 92System Sensor Open: An open circuit has been detected in the system temperature
sensor circuit.
1. Check system temperature sensor and wiring 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 93Outdoor Sensor Shorted: A short circuit has been detected in the outdoor tem-
perature sensor circuit.
1. Check outdoor temperature sensor and wiring 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 94Internal Display Fault: Display memory errorTurn unit o and on to resume normal operation.
E 95Supply Sensor Error: Supply sensor reading is invalid
1. Check wiring between display and control module.
2. If necessary replace the sensor, or the wire harness.
3. After xing the problem reset the appliance and resume normal operation.
E 96Outdoor Sensor Open: An open circuit has been detected in the outdoor tempera-
ture sensor circuit.
1. Check outdoor temperature sensor and wiring 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 97Cascade Mismatch: Cascade conguration has changed.1. Run autodetection if change was intentional, or else check wiring between appliances.
2. Appliance will automatically reset once repaired.
E 98Cascade Bus Error: Communication with other appliances has been lost.1. Check wiring between appliances.
2. Appliance will automatically reset once repaired.
E 99Controller Bus Error: Communication between appliance display and control
module has been lost.
1. Check wiring between components.
2. Appliance will automatically reset once repaired.
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