HeatMaster 25 C: A1003474 - 664Y7000 • B
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LOCKING CODES
Codes
Description of the fault
Solution for the fault
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 fixing the problem reset the appliance and resume normal operation.
E 80
Return > Supply
: Return temperature is higher than supply temperature.
Confirm water flows in boiler return and out boiler supply.
E 81
Sensor Drift
: Supply and return temperatures are not equal.
1. Check water is flowing through boiler.
2. Wait a few minutes for the water to equalise the temperature, the boiler will automatically reset once temperatures
become equal.
3. If boiler doesn't reset, check the NTC's and check the wire harness, replace if necessary.
E 85
Pump 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 86
Pump hard fault
: Pump Failure
Pump Failure, check if pump PWM-feedback wire is properly connected, replace pump when neccessary
E 87
External Limit Open
: An external boiler limit has opened.
1. Correct condition which caused limit to open, then reset boiler.
2. The boiler needs to be reset once external limit closes.
E 89
Incorrect Setting
: A parameter setting is outside the settings range.
1. Review CH & DHW settings and correct as necessary.
2. The boiler will automatically reset once corrected.
E 90
Firmware Mismatch
: Control module and display firmware versions are incompat-
ible.
One or several components are not compatible with the system. Replace mismatched component(s).
E 91
System 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 fixing the problem reset the appliance and resume normal operation.
E 92
System 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 fixing the problem reset the appliance and resume normal operation.
E 93
Outdoor 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 fixing the problem reset the appliance and resume normal operation.
E 94
Internal Display Fault
: Display memory error
Turn unit off and on to resume normal operation.
E 95
Supply 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 fixing the problem reset the appliance and resume normal operation.
E 96
Outdoor 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 fixing the problem reset the appliance and resume normal operation.
E 97
Cascade Mismatch
: Cascade configuration has changed.
1. Run autodetection if change was intentional, or else check wiring between boilers.
2. Boiler will automatically reset once repaired.
E 98
Cascade Bus Error
: Communication with other boilers has been lost.
1. Check wiring between boilers.
2. Boiler will automatically reset once repaired.
E 99
Controller Bus Error
: Communication between boiler display and control module
has been lost.
1. Check wiring between components.
2. Boiler will automatically reset once repaired.
