Fault Codes; Fault Memory - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

8 Troubleshooting
Display Meaning
d.78 Storage charging temperature limit (target flow tem-
perature in storage mode, system boilers only)
d.80 Heating operating hours
d.81 Water heating operating hours (combination boilers
only)
d.82 Cycles in heating mode
d.83 Cycles in hot water operation
d.84 Maintenance indicator: Number of hours until the next
maintenance
d.93 DSN appliance variant setting
d.96 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
F. 0 Flow–NTC open circuit
F. 1 Return–NTC open circuit
F.10 Flow NTC short circuit
F.11 Return NTC short circuit
F.13 Tank NTC short circuit
F.20 Safety temperature limiter by NTC activated
F.22 Dry fire
F.23 Water shortage, temperature difference between flow
and return NTC too large
F.24 Water shortage, temperature rise too quick
Table 8.4 Error codes
46
Supplied By www.heating spares.co Tel. 0161 620 6677
Display value/adjustable value
Adjustment range in °C 55 to 90 (Factory setting: 80)
1)
in h
1)
in h
1)
Quantity/100 (3 corresponds 300)
1)
Quantity/100 (3 corresponds 300)
Adjustment range: 0 to 3000 h and "-" for disabled
Factory setting: "-" (300 corresponds to 3000 h)
Adjustment range: 0 to 99
1 = Resetting adjustable parameters to factory setting
Cause
NTC broken, NTC cable broken, Defective connection at NTC,
Defective connection at electronics
NTC broken, NTC cable broken, Defective connection at NTC,
Defective connection at electronics
NTC defective, short circuit in cable harness, cable/casing shortcut
NTC defective, short circuit in cable harness, cable/casing shortcut
NTC defective, short circuit in cable harness, cable/casing shortcut
Flow-NTC not correctly thermal-connected or defective; appliance
does not shut down
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
Pump blocked or defective, pump output too low, flow and return
NTC interchanged
Pump blocked, insufficient pump output, air in appliance, water
pressure too low
Instructions for installation and servicing ecoTEC