Replacement Of Parts; Fan; Hot Surface Igniter; Flame Sensor - Potterton Envoy System 30 Installation & Service Instructions Manual

Servicing & Replacement of Parts - Page 20
7) Replacement of components is the reverse of removal.
Note: great care should be taken not to damage the flue
hood and combustion chamber seals during
replacement of these assemblies.
8) When refitting retaining clamps ensure that they are
located correctly in the guides on both the flue hood and
combustion chamber.
9) Ensure that the combustion chamber seats correctly
onto the heat exchanger, that the screws are fully

Replacement of Parts

Before replacing any component carry out pre-check
detailed at the beginning of the Service section and then
refer to fault finding section of these instructions.
WARNING
Before the start of any servicing or replacement of parts
ensure that you have:
a) Switched off at the external electrical supply by
removing the plug from the wall socket or by switching
off the appliance at the external isolating switch.
b) Isolated the gas supply at the boiler service cock.
If the combustion chamber has been removed follow
procedure in Service section 'Re-assembly of boiler'

1) Fan

a) Follow procedure in 'Preparation for servicing' at the
beginning of the servicing section.
b) Replacement of fan is the reverse of removal.

2) Hot Surface Igniter

WARNING This component is fragile and requires
careful handling.
a) Remove combustion chamber as described in
'Servicing Boiler'.
b) The igniter assembly is retained by two M5 pozi drive
screws. Remove screws and carefully remove old
igniter, if the igniter has become damaged, invert the
combustion chamber and shake gently to allow
damaged segments to be removed from the chamber.
See Fig. 19.
c) Replacement of the igniter is the reverse of removal
ensure that a new sealing gasket is always fitted and
that a good seal is made between the igniter and
combustion chamber.
20 Servicing & Replacement of Parts
Supplied By www.heating spares.co Tel. 0161 620 6677
tightened and that the clamps fix the combustion
chamber and flue hood securely.
10) Ensure connection from sump to syphon is made
before refitting fan.
11) Ensure that the flue sealing gaiter between the flue
hood and elbow is correctly positioned untwisted and
forms a good seal to both components.
12) Relight the boiler as described by following the lighting
procedure in the commissioning section of these
instructions.

3) Flame Sensor

a) Remove combustion chamber as described in
'Servicing Boiler'.
b) Remove screw retaining sensor and withdraw from the
combustion chamber. See Fig. 19.
c) Replacement of the sensor is the reverse of removal,
ensure new gasket is always fitted.

4) Insulation

Note: all four insulation pads must be replaced.
a) Remove combustion chamber as described in
'Servicing Boiler'. See Fig. 17.
b) Remove hot surface igniter, flame sensor. Fig. 19 and
burner Fig. 20.
c) Remove old insulation.
d) Replace front pad first ensuring that bevelled edge is
uppermost and fits into the chamber correctly.
e) Fit rear pad and use end insulation to retain rear pad.
Publication No. 559787