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46 Instructions for installation and servicing ecoTEC
Display Meaning Display value/adjustable value
d.78 Storage charging temperature limit (target flow tem-
perature in storage mode, system boilers only)
Adjustment range in °C 55 to 90 (Factory setting: 80)
d.80 Heating operating hours in h
1)
d.81 Water heating operating hours (combination boilers
only)
in h
1)
d.82 Cycles in heating mode Quantity/100
1)
(3 corresponds 300)
d.83 Cycles in hot water operation Quantity/100
1)
(3 corresponds 300)
d.84 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)
d.93 DSN appliance variant setting Adjustment range: 0 to 99
d.96 Factory setting 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.
Table 8.3 Diagnostics codes of the second diagnostic level
(continued)
8.1.3 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.
8.1.4 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 dis-
play will now revert back to showing the current flow
temperature.
Code Meaning Cause
F. 0 Flow–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC,
Defective connection at electronics
F. 1 Return–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC,
Defective connection at electronics
F.10 Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.13 Tank NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.20 Safety temperature limiter by NTC activated Flow-NTC not correctly thermal-connected or defective; appliance
does not shut down
F.22 Dry fire Too little water in the appliance, water pressure sensor defective,
cable to pump or water sensor defective, pump blocked or defec-
tive, pump output too low
F.23 Water shortage, temperature difference between flow
and return NTC too large
Pump blocked or defective, pump output too low, flow and return
NTC interchanged
F.24 Water shortage, temperature rise too quick Pump blocked, insufficient pump output, air in appliance, water
pressure too low
Table 8.4 Error codes
8 Troubleshooting
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