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Chapter 4
Appendix
4.1 The displaying of error messages
HPM recognises a number of trouble indications and errors. You will see them when
the error message alternates with the defaukt display. The following short text can be
seen:
FP-system
Frost protection for the system, flow temperature below frost limit
FP-stor
Frost protection for storage tank, storage tank temperature below frost limit
BP-frRoom
Building protection, room temperature below frost limit
BP-heRoom
Building protection, room temperature above heat limit
uLiColl
Solar collector above upper limit
uLiStor
Storage tank temperature above upper limit
uLiFlow
Flow temperature above upper limit
TI-system
Trouble indication, system: error message input active
TI-input
Trouble indication input (short or broken cable)
thermDes
Thermal disinfection could not be finished
Xw-loadFl
Loading flow temperature difference between current value and setpoint is above max.
control deviation
Xw-room
Loading flow temperature difference between current value and setpoint is above max.
control deviation
Xw-buffer
Storage tank temperature difference between current value and setpoint is above max.
control deviation
Xw-bufferVL
Storage tank flow temperature difference between current value and setpoint is above
max. control deviation
Xw-flow
Flow temperature difference between current value and setpoint is above max. control
deviation
Xw-contr
Temperature difference of control sensor between current value and setpoint is above
max. control deviation
These error messages do not have to be acknowledged; the error message will
disappear automatically as soon as the problem has been solved.
Furthermore, the error code sent to the HPM when it is connected via Bus will be
shown in the display of the controller. Some of these errors must be acknowledged. A
list of all possible error messages of the heat pump are described in the operating and
service manual of the pump.
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