Potterton Flamingo RS40 Installation And Service Manual page 23

2. Disconnect the thermocouple lead from the gas control valve, noting the route the lead takes from the
combustion chamber. The replacement lead must be routed in a similar manner, so that sharp bends in
the lead are eliminated.
3. Replacement is the reverse of removal.
4. Test the boiler as described in 6, 'Final Adjustment'
e. Honeywell Gas Control Valve
1. Turn off the boiler main gas cock.
2. Switch off the main electricity supply to the boiler.
3. Pull off the thermostat knob, then unscrew the screw securing the controls cover to the boiler and slide
off the cover.
4. Remove the screw securing the cover over the electrical connections on the valve, then remove the
cover and disconnect the wires, noting where
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Service Section – Page 18