Vaillant ecoTEC plus SERIES, Instructions For Installation And Servicing

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Installation and Servicing ecoTEC plus
42
Table 10.3 Diagnostics codes of the second diagnostic level (continued)
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 short cut
F.11 Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing short cut
F.13 Tank NTC short circuit NTC defective, short circuit in cable harness, cable/casing short cut
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 defective, 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 10.4 Error codes
10 Troubleshooting
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.
Display Meaning Display value/adjustable value
d.78 Storage charging temperature limit (target flow
temperature 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 (when accessories
are fitted) in h
1
)
d.82 Cycles in heating mode Quantity/1001) (3 corresponds 300)
d.83 Cycles in hot water operation Quantity/1001) (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.
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.