Recommissioning The Boiler; Test Operation; Troubleshooting; Logical Fault Finding Procedure - Vaillant ecoTEC PLUS SERIES Installation And Maintenance Manual

7 Inspection and maintenance

8 Troubleshooting

7.5

Recommissioning the boiler

• Carry out electrical safety checks.
• Turn on the electrical supply.
• Open the boiler CH service valves.
• Carry out function checks of boiler operation as previ-
ously detailed.
• Check gas rate as previously detailed.
• Check for water leaks.
• Refit case, ensuring that a good seal is obtained.
7.6

Test operation

Always perform the following checks after completing
any maintenance task:
• Commission the appliance according to the relevant
operating manual.
• Check the appliance for gas and water leaks.
• Check the air/flue gas system for leaks, check its fas-
tening
• Check for ignition and an even flame on the burner.
• Check that the heating system and the water heating
is working (only 800 series).
• Fill out the benchmark logbook.
Fig. 7.11 Function check
8 Troubleshooting
8.1

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
'Preliminary Electrical Checks').
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'.
44
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
'Gas Supply').
4. Ensure the heating system is full of water and charged
to between 1 and 1.5 bar. If not, refill and vent the sys-
tem. (See section 'Filling the heating system'). Ensure
boiler flow and return service valves are open.
5. Check that the main on/off control is set to the 'on'
position.
6. Set the central heating temperature to maximum.
7. Set the domestic hot water temperature to maximum
(only 800 series).
8. 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.
8.1.1

Status codes

The status codes that you can see on the display pro-
vides information about the current operating condition
of the appliance.
The display of the status codes can be called as follows:
plus
Fig. 8.1 Display of status codes
• Press the "i" key.
The display shows the status code, e.g. S.04 for
"Burner mode - Heating".
The display of the status codes can be ended as follows:
• Press the "i" key
or
• Do not press any key for about 4 minutes.
The current heating flow temperature appears in the
display again.
pro
Installation and maintenance manual ecoTEC