Temperature Sensor (Ntc); Gas Valve - Vaillant TURBOmax VUW 242 E Instructions For Installation And Servicing

7.6 Replacement of NTC
temperature sensor
Note: The NTC temperature sensor is
an extremely reliable component and
as such is unlikely to fail. Before
changing the NTC please check that
it is defective - see section 8 - fault
finding.
•
Disconnect boiler from electricity
supply.
•
Remove front casing as in section
7.1.3 and remove combustion
chamber cover as in section 7.1.5
•
Pull off connecting wire to sensor.
•
Unscrew NTC sensor. (4, fig 62)
•
Reassemble in reverse order.
•
Carry out electrical checks (see
section 5.1).
7.7 Replacement of gas valve
•
Isolate the boiler from the electrical
supply.
•
Remove front casing as in section
7.1.3
•
Lower front control panel as in
section 7.1.6
•
Turn off the gas service valve (1, fig
50).
•
Remove screw (5, fig. 59) and lift
off gas operator cover.
•
Disconnect modulating coil wires at
plug provided and pull wires off
gas operator.
•
Disconnect air tube ( 7, fig. 59)
from operator.
•
Disconnect ignition leads (3, fig.
65) from rear of control box.
•
Remove three screws (1 + 2, fig.
65) and lift off control box rear
covers. Disconnect main solenoid
wires from main switchboard and
boiler earth strip.
•
Remove two screws (3, fig. 59)
•
Slacken retaining screw (8, fig. 59).
•
Rotate gas valve to the left and then
lift up to remove.
•
Reassemble in reverse order.
•
Set burner pressure in accordance
with instructions supplied with
spare part.
•
Carry out electrical checks (see
section 5.1).and test all gas joints
for soundness
36
Supplied By www.heating spares.co Tel. 0161 620 6677
fig. 59