Test Programs; Resetting Parameter To Factory Settings; Parts Replacement; Safety Instructions - Vaillant ecoTEC plus Instructions For Installation And Servicing

10 Troubleshooting

11 Parts Replacement

10.2

Test programs

Special functions can be triggered on the appliances
by activating various test programs.
These programs are given in detail in the Table 10.5.
• The test programs P.0 to P.6 will be started when
"Power ON" is turned on and the "+" key is pressed
for 5 s. The display shows "P.0".
• Press the "+" key to start counting the test number
upwards.
• Press the "i" to operate the appliance now and to
start the test program.
• Press "i" and "+" simultaneously to exit the test
programs. You can also exit the test programs by not
pressing any key for 15 minutes.
Display Meaning
P.0 Bleeding test program. The heating circuit and
hot water circuit (when accessories are fitted) is
bled via the automatic air vent (the cap on the
automatic air vent must be loosened).
P.1 Test program where the appliance is operated in
full load after successful ignition
P.2 Test program where the appliance is operated with
minimum gas volume (ignition gas volume) after
successful ignition
P.3 Not available
P.4 Not available
P.5 Test program for the safety temperature limit
check; appliance heats up by by-passing a
regulating shut down through the flow regulator
until the shut off temperature of 97 °C is achieved.
P.6 Filling test program. The diverter valve moves to
the centre position
Table 10.5 Test programs
10.3

Resetting parameter to factory settings

Besides the option to reset individual parameters
manually to the factory settings specified in tables
10.2 and 10.3, you can also reset all parameters
simultaneously.
• In the second diagnostic level, under the diagnostic
number "d.96" change the value to 1
(see section 10.1.2).
The parameters of all adjustable diagnostic
numbers now correspond to the factory settings.
44
11 Parts replacement
The tasks listed below in this section may be carried
out only by a qualified engineer.
• Only use genuine spare parts for repairs.
• Make sure the parts are correctly fitted and that
their original position and alignment are retained.
11.1

Safety instructions

Danger!
Each time the components are replaced,
comply with the safety instructions below
for your own safety and to avoid damage to the
appliance!
• Put the appliance out of operation.
Note!
Before starting any maintenance work: Isolate
the mains electricity supply by disconnecting
the plug at the socket outlet (if there is only
an isolating switch remove the fuse from the
switch).
Close the service valve in the gas supply.
Isolate the boiler flow and return if possible.
Empty the appliance if you want to replace water
bearing components of the appliance!
Make sure that no water drops on live components
(e.g. switch box etc.)!
Use only new seals and O-rings!
After completing the work, check for gas leaks and
perform a function check (see section 7)!
Always check earth continuity, polarity and resistance
to earth with a multimeter after any service work and
after exchanging any electrical component.
11.2

Replacing the burner.

For access refer to section 8.1.4.
Remove the burner refer to section 8.1.6
11.3

Replacing the gas valve

For access refer to section 8.1.4.
Remove the gas valve, fan and burner refer to the
relevant parts of section 8.1.6.
Before removing the gas valve note its position on the
fan. Remove the three securing screws, which fix the
gas valve, plastic swirl plate to the venturi on the fan.
Remove the gas valve.
Remove the gas supply pipe from the gas valve.
When refitting the gas valve take care as it can be
fitted more than one way.
After assembly test for gas soundness and purge
in accordance with the current issue of BS6891 or
in IE, the current edition of I.S.813 "Domestic Gas
Installations".
11.4

Replacing the fan

Remove the gas valve refer to section 11.3.
Remove the venturi plate secured with three screws
and remove the two screws securing the fan to the gas
manifold, see fig 11.1.
Check the gasket and replace if necessary.
Installation and Servicing ecoTEC plus