SERVICING
42
europa
--- Installation & Servicing
63 PROGRAMMER REPLACEMENT
1 Disconnect the electrical supply.
2 Gain access to the main control p.c.b. (steps 1 to 4 of
frame 53).
3 Disconnect the wiring at the programmer.
4 Squeeze the hooks that hold the programmer on the
control panel fascia and withdraw the faulty programmer.
5 Re---assemble in reverse order.
When reassembling the new programmer, refer to the wiring
diagram in frame 22 for the correct wiring connection.
6 Replace the panels and check the operation of the new
programmer.
64 CH DRAIN COCK REPLACEMENT
1 Disconnect the electrical supply
2 Remove front and right hand casing panels (refer to frame
33).
3 Close off the isolating cocks of the CH circuit at the
bottom of the boiler.
4 Release system pressure by opening the main circuit
drainage cock.
Do not release CH pressure using the pressure relief
valve. It may cause debris within the system to foul
the valve.
5 Remove the CH drain cock A from the return body.
6 Re---assemble in reverse order.
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