Vaillant ecoTEC plus SERIES, Instructions For Installation And Servicing

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Installation and Servicing ecoTEC plus
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10 Troubleshooting
10 Troubleshooting
10.1 Logical fault finding procedure
These checks must be carried out before attempting to
use the fault finding guide.
1. Carry out electrical safety checks (see section 4
‘Wiring system’).
2. Check that the external electricity supply to the
boiler is on, and a supply of 230 V~ is present between
boiler terminals ‘L’ and ‘N’.
3. Check that the gas supply to the boiler is on, that it
has been correctly purged and that an inlet pressure
of 20 mbar is available at the gas valve. (See section 5
‘Gas Supply’).
4. Ensure the heating system is full of water and the
system design pressure is attained. (sealed systems
only). If not, refill and vent the system. Ensure any flow
and return isolating valves (if fitted) are fully open.
5. Set the central heating temperature to maximum.
6. Set the domestic hot water temperature to
maximum (Only if additional Vaillant accessories are
fitted).
7. Check that all external controls are on and calling
for heat (if no external controls are fitted, boiler
terminals 3 and 4 must be linked). Check that the
boiler anti cycling economiser is not engaged.
10.1.1 Status codes
The status codes that you can see on the display
provides information about the current operating
condition of the appliance.
The display of the status codes can be called as
follows:
• Press the “i” key.
The display shows the status code, e.g. S.4 for
“Burner mode - Heating". The display of the status
codes can be cancelled as follows:
• Press the “i” key.
• Do not press any key for approx. 4 minutes.
The current heating flow temperature appears in the
display again.
Fig. 10.1 Display of status codes
Display Meaning
Heating mode (all models):
S. 0 No heat demand
S. 1 Fan running
S. 2 Water pump running
S. 3 Ignition sequence
S. 4 Burner ignited
S. 5 Fan and pump running
S. 6 Fan over run
S. 7 Pump over run
S. 8 Anti cycling mode
Domestic hot water mode
(when accessories are fitted)
S.20 Warmstart demand
S.21 Fan running
S.22 Pump running
S.23 Ignition sequence
S.24 Burner ignited
S.25 Fan and water pump running
S.26 Fan over run
S.27 Pump over run
S.28 Anti cycling mode
Table 10.1 Status codes