Operational faults

8 Operational faults

Malfunctions or faults are indicated by the

icon blinking on the display.

8.1Sensor failure

The following list explains how the controller responds to the failure of the different sensors. Safety functions such as frost protection and excess temperature protection no longer work when a sensor fails.

￿Outdoor sensor 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 in heating circuit VF1/VF2: When the flow sensor is defective, the controller continues to work with the associated valve in the 30 % valve position. DHW heating which uses such a sensor to measure the charging temperature is interrupted. In systems Anl 4, 5, 6 and 11, the failure of flow sensor VF2 cause the DHW control valve to close.

￿Flow sensor in DHW circuit VF3: When the flow sensor VF3 is defective, the DHW heating takes place without change in lag/lead sequence.

￿Return flow sensor RüF1/RüF2: The controller continues to function without the return tem- perature limitation when the return flow sensor fails.

￿Room sensor RF: The controller functions using the settings for operation without room sen- sor when the room sensor fails. For example, optimization mode switches to the reduced op- eration mode. Adaptation mode is interrupted. The last defined heating characteristic is not changed anymore.

￿Storage tank sensor SF1/SF 2: When one of the sensors fail, DHW heating no longer takes place.

￿Solar circuit sensor SF2/CF: When one of the sensors fails, the solar circuit pump is switched off.

8.2Collective error alarm

As an alternative to the Pump management function, a fault alarm can be indicated over the bi- nary output BA8. Should the error status register FSr indicate a fault, the binary output BA8 is activated.

Function

WE

Configuration

Fault alarm output BA8

OFF

FB47 = ON

64EB 5476 EN

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Samson 5476 manual Operational faults, Sensor failure, Collective error alarm

5476 specifications

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