Vaillant eco TEC plus 415 Instructions Manual Download

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Installation and Servicing ecoTEC plus

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

)

d.81

Water heating operating hours (when accessories
are fitted)

in h

)

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.