Maintenance indicator: Number of hours
until the next maintenance
Adjustment range: 0 to 3000 h and “-”
for disabled Factory setting: “-” (300
corresponds to 3000 h)
DSN appliance variant setting
Adjustment range: 0 to 99
1 = Resetting adjustable parameters to
factory setting
1) Five-digit numbers are saved with the diagnostics codes 80 to 83. If d.80, for example, is
selected, only the first two digits of the number are displayed (e. g. 10). The display switches to
the last three digits (e. g. 947) by pressing “i”. In this example the number of operating hours of
the heating is 10947 h. The display returns to the selected diagnostics item by pressing “i”
again.
10.1.3 Fault codes
Fault codes take priority over all other display functions in the event of a system fault occurring.
If multiple faults occur, the corresponding fault codes are displayed alternately for about two
seconds each.
10.1.4 Fault memory
The fault memory stores details of the ten most recent faults.
● Press the “i” and “–” buttons simultaneously.
● Use the “+” button to scroll back through the list of memorised errors.
To cancel fault error memory display mode, proceed as follows:
● Press the “i” button below the display or
● Do not touch any key for about four minutes.
The display will now revert back to showing the current flow temperature.
Table 10.4 Error codes
NTC broken, NTC cable broken,
Defective connection at NTC, Defective
connection at electronics
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