7.0
GENERAL
The following must always be carried out by a competent/qualified person.
7.1
PRECAUTIONS
i)
Always switch off the mains electricity supply and disconnect the plug at the
isolating switch and socket. (If a switch only is used then remove the fuse.)
ii)
Gain access to the appliance (Section 7.2) and turn off the gas supply at the
appliance service cock.
7.2
ACCESS
i)
Remove the front door by removing the three screws to the front of the top panel.
The front panel may then be removed by tilting forward and lifting vertically to
disengage the two locating studs in the base of the front panel.
ii)
Access to the burner head can be gained by removing the access plate in the top
panel of the appliance.
iii)
Access to the rear of the control panel and base of the unit can be gained by
removing the control panel at the bottom of the boiler. Remove the two screws to
the control panel then gently pull the control panel free of the boiler casing. This is
secured by three press studs on either side and a central press stud at the bottom
of the control panel.
7.3
REPLACEMENT PROCEDURES
i)
Always replace in the reverse order unless otherwise stated.
ii)
Electrical connections must be remade in accordance with the Wiring Diagram
(Section 5.5).
iii)
Test the soundness of any gas carrying or water carrying joint broken during the
service procedures.
7.4
ELECTRICAL COMPONENTS
7.4.1
On/Off Switch
(Fig. 5.7.1 item 113)
i)
Isolate the appliance (Section 7.1)
i)
Gain access (Section 7.2)
iii)
Remove the push on connectors from the switch taking note of the
correct positions.
iv)
Press in the catches and push the switch forwards through the control
panel.
v)
Reassemble (Section 7.3)
v)
Check for correct operation of the switch.
7.4.2
Boiler Thermostat
(Fig. 5.7.2 item 63)
i)
Isolate the appliance (Section 7.1)
ii)
Gain access (Section 7.2)
iii)
Remove the push on connectors from the thermostat taking note of the
correct positions.
iv)
Unscrew the two retaining screws and remove the thermostat.
WD51/2/1997 Chapter 7 : Replacement Of Parts
The Keston 170 Condensing Boilers
Installation & Servicing Instructions
Page : 42
