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44 Instructions for installation and servicing ecoTEC
First Diagnostic level
• Press the “i” and “+” keys simultaneously.
The display shows “d.0”.
• Use the “+” or “–” keys to scroll through the desired
diagnostic numbers of the first diagnostic level (see
table 8.2).
• Press the “i” key.
The display shows the relevant diagnostic information.
• If necessary, use the “+” or “–” keys to change the
value (display flashes).
• Save the new value by holding down the “i” key for
approx. 5 seconds until the display no longer flashes.
Display Meaning Display value/adjustable value
d. 0 Heating part load Adjustable heating part load in kW (factory setting: max. output)
d. 1 Water pump over run time for heating mode 2 - 60 min (factory setting: 5 min)
d. 2 Max. burner anti cycling period at 20 °C Flow tempera-
ture
2 - 60 min (factory setting: 20 min)
d. 3 Hot water flow temperature reading (combination boiler
only)
in °C
d. 4 Current temperature for warm start sensor
(combination boilers only)
Current storage tank sensor (system boilers only)
in °C
d. 5 Flow temperature target value or return target value
when return regulation is set.
in °C, max. the value set in d.71
Limited by the eBUS controller (if an eBUS controller is connected)
d. 6 Hot water temperature target value in °C, 35 to 65 °C
d. 7 Warm start temperature target value
(ecoTEC plus combination boiler only)
Storage temperature target value (system boiler only)
in °C, 40 to 65 °C
in °C, 15 °C for left stop, then 40 to 70 °C
d. 8 External controls heat demand (Clamp 3-4) 0 = open (no heat request)
1 = closed (heat request)
d. 9 Flow target temperature from external analogue regula-
tor to terminal 7-8-9/eBUS
in °C, minimum from ext. eBUS target value and target value terminal
7
d.10 Status internal heating pump 1 = on, 0 = off
d.11 Status external heating pump 1 to 100 = on, 0 = off
d.12 Cylinder charging pump (via accessory module) 1 to 100 = on, 0 = off
d.13 Hot water circulation pump (via accessory module) 1 to 100 = on, 0 = off
d.22 Hot water demand 1 = on, 0 = off
d.23 Summer/Winter function 1 = Winter, 0 = Summer
d.25 Hot water activation via eBUS Control 1 = yes, 0 = no
d.30 Control signal for both gas valves 1 = on, 0 = off
d.33 Fan speed target value in rpm/10
d.34 Fan speed actual value in rpm/10
d.35 Position of diverter valve (combination boilers only) 0 = Heating; 100 = Hot water; 40 = Centre position
d.36 Hot water flow sensor in l/min
d.40 Flow temperature Actual value in °C
d.41 Return temperature Actual value in °C
d.44 Digitised ionisation potential Display range of 0 to 102, > 80 no flame, < 40 even flame
d.47 Outside temperature
(with weather compensating Vaillant controller only)
Actual value in °C
d.67 Remaining burner anti cycling time in min
d.76 Appliance variant (device specific number) 00 to 99
d.90 Digital regulator status 1 = identified, 0 = unidentified (eBUS Address <=10)
d.91 DCF status with connected external probe with DCF77
receiver
0 = no reception, 1 = reception, 2 = synchronised, 3 = valid
d.97 Activation of the second diagnostic level Password: 17
Table 8.2 Diagnostic codes of the first diagnostic level
You can end the diagnostic mode as follows:
• Press the “i” and “+” keys simultaneously.
or
• Do not press any key for approx. 4 minutes.
The current heating flow temperature appears in the dis-
play again.
8 Troubleshooting
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