Replacing Fan Or Gas Valve; Replacing Expansion Vessel - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

9 Parts replacement
• Mount the new burner with a new seal. Ensuring that
the notch in the burner aligns with the burner viewing
window.
• Install the compact thermo module as described in
Section 7.2.4.
• After completing the work, check for gas leaks and
perform a function check (see Section 7.6)!
9.3

Replacing fan or gas valve

Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
• Turn off the boiler.
• Isolate the electrical supply to the boiler
• Remove the air intake pipe (Fig. 7.1, Pos. 2).
• Loosen the gas supply pipe on the gas fitting (Fig. 7.2,
Pos. 3).
4
Fig. 9.2 Dismantling fan with gas fitting
• Pull out the plug (4) from the gas valve.
• Pull out the plug (3) from the fan.
• Remove the three screws (2) on the compact thermo
module (1).
• Remove the complete "gas valve/fan" unit.
50
5
Fig. 9.3 Gas fitting/fan screwed joint
• Remove both fixing screws (5) on the gas valve and
remove the fan from the gas valve.
• Replace the defective component.
Caution!
Mount the gas valve and the fan in the same
position as before.
• Screw on the fan with the gas valve. Please use new
seals.
• Install the complete "gas valve/fan" unit in reverse
sequence.
• After completing the work, check for gas leaks and
perform a function check (see Section 7.6)!
9.4

Replacing expansion vessel

1
Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
2
• Disconnect the appliance from the mains as described
in Section 9.1, and close the service cock in the gas
supply pipe.
3
• Close the flow and return service cocks and drain the
water from the boiler.
Instructions for installation and servicing ecoTEC