Changing a Combi sensor

Looking at the manual, fairly straightforward - it appears to be on the outlet pipe as it drops from the base of the main heat exchanger compartment. Email me if you want a copy of the manual. I would guess you turn off the mains cold water, drain off some of the pressure at a lower tap, then disconnect the wire from the sensor and unscrew it.

Its says its been superceded but list the following part:

Manufacture: Ferroli Manufactures Part Code: 39800310 SuperCeded Code: G.C. Part Number: Type & Description: SENSOR - 1K PTC DHW / CH (WET) Appliance Type/Name: NA Price Ex VAT: £12.24

Thanks John, your information is very much appreciated.

I downloaded a copy of the manual last week.