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| Operational faults |
8 | Operational faults |
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Malfunctions or faults are indicated by the |
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| icon blinking on the display. Error immediately | |
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appears on the display. Press the enter key to open the error level. It may be possible to view several error alarms by pressing the enter key. As long as an error alarm is present, the error level appears in the display loop, even though it has not been opened by pressing the enter key.
In the error level, the controller indicates a defective sensor by displaying the corresponding sensor combination. A fault is displayed as specified in the list below.
8.1Error list/sensor failure
ERR 1 | Sensor broken in RK1 (in connection with the corresponding sensor icon) |
ERR 2 | Sensor broken in RK2 (in connection with the corresponding sensor icon) |
ERR 3 | Sensor broken in RK3 (in connection with the corresponding sensor icon) |
ERR 4 | Sensor broken in DHW circuit (in connection with the sensor icon) |
ERR 5 | Sensor broken in primary circuit (in connection with the sensor icon) |
ERR | Standard data entered again (default settings) |
ERR | Final temperature of the thermal disinfection not reached |
ERR | Mode selector switch 1 defective |
ERR | Mode selector switch 2 defective |
ERR | Mode selector switch 3 defective |
ERR 10 | Temperature limitation of DHW heat exchanger active |
In the error level, ERR1 to ERR5 on the display indicates the sensor failures as per the error list. Detailed information over a sensor failure can be retrieved within the information level by poll- ing individual temperatures: each sensor icon displayed together with – – – – indicates a defec- tive sensor. The following list explains how the controller responds to the failure of the different sensors.
Outdoor sensors AF: When the outdoor sensor fails, the controller uses a flow temperature set point of 50 °C or the Max. flow temperature (when the Max. flow temperature is smaller than 50 °C).
Flow sensor VF: When the flow sensor is defective, the controller continues to work with the valve in the last position.
Flow sensor in the DHW heat exchanger VFT: The DHW control valve is closed when the sensor fails.
Flow sensor in the DHW storage tank VFS: The flow set point for the DHW heat exchanger is only controlled with VFT. The display blinks.
Return sensor RüF: When the return flow sensor is defective, the controller continues to work without the return flow temperature limitation function.
EB 5179 EN 67
