To replace pump •Drain down heating circuit of boiler only as fol- lows: •Close isolating valves on flow and return connec- tions on fixing jig,

REPLACEMENT OF PARTS

•Fit replacement PCB in reverse order to removal. Important: To replace ignition PCB When fitting replacement PCB, ensurethat control knob spindles correctly locate into PCB adjuster slots. •Refit connectors and covers in reverse order to removal. •Gain access to PCB's as described in previous section. •Remove main PCB securing screw as described in previous section. •Pull off three electrical connectors on PCB. •Lift up ignition PCB, separate from main PCB and remove from boiler. •Fit replacement PCB in reverse order to removal. •Refit connectors and covers in reverse order to removal.
Diagram 31 Cla 007 see diagram 32.
Diagram 32 Des 054 •Fit capillary of new gauge to front section using new 'O' ring supplied. •Open isolating valves on flow and return con- nections, refill, vent and pressurise boiler. Check for leaks. To replace reversing valve assembly •Remove temperature/pressure gauge capillary as described previously. •Remove pump as described previously. •Remove microswitch assembly as described pre- viously. •Remove retaining clip from LHS pipe connection on front section of valve and disengage pipe. •Unscrew and disconnect heating flow (centre) connection at fixing jig. •Remove retaining clip from heating flow pipe connection on right of front section. •Remove flow pipe from boiler. •Unscrew and disconnect heating return (left hand) connection at fixing jig. •Remove retaining clip from expansion vessel pipe connection at rear of reversing valve assembly and disengage pipe, pushing pipe back and out of re- versing valve. •Undo and remove large screw holding water valve to back plate of reversing valve assembly, 20