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19 Replacement of Parts
Diagram 19.15
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OVERHEAT
THERMOSTAT
9687
RESET
BUTTON
Diagram 19.14
HEATING SAFETY VALVE (3 bar)
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DOMESTIC SAFETY VALVE (10 bar)
• Open isolating valves on flow and return connections, refill,
vent and pressurise boiler.
• Check for leaks.
19.21 Overheat thermostat, refer to diagram
19.15.
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Remove the sealed chamber cover, refer to Section 16.5.
• Locate high limit thermostat on heating flow pipe on left hand
side of boiler
• Disconnect electrical connection from thermostat
• Unclip thermostat from heating flow pipe.
• Fit replacement thermostat in reverse order to removal. (Use
heat sink compound supplied).
• Refit connection to thermostat.
19.22 Combustion chamber insulation
Before starting refer to the front of Section 19 Important
information.
• Remove the front panel, refer to Section 16.3.
• Lower the control panel, refer to Section 16.4.
• Remove the sealed chamber cover, refer to Section 16.5.
• Remove the combustion chamber cover, refer to Section
16.7.
• Remove main heat exchanger, refer to Section 19.20.
• Remove fan and loosen flue hood, refer to relevant parts of
Sections 19.3 and 16.9.
Front panel insulation
• Lift front insulation panel free from retaining lugs on combustion
chamber cover.
Rear panel insulation
• Pull rear insulation panel free from retaining lug at rear of
combustion chamber by tilting forward.
• Fit replacement insulation panels in reverse order to removal
• Refit combustion chamber cover.
Side Panels
Note: Rear panel must be removed first.
• Pull out side panels free from retaining lugs at side of
combustion chamber by tilting sideways.
• Fit replacement insulation panels in reverse order to removal.
• Refit combustion chamber cover.
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