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PostPosted: Fri Jan 19, 2018 3:24 pm 
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I have had enough of my Corgi Homeplan guys turning up to fix my F75 issue and trying to sell me a powerflush when the system is clean and has a MagnaClean on. If I refuse they don't change the pressure sensor, which is all that is required and they walk out. I have now cancelled their service.

I know from experience that the pressure sensor just needs changing and will last 24 months. I know how to fit the pressure sensor and now have 2 in stock.
However I do not know how to drain the boiler (not the whole heating system just the boiler) so I can fit the valve (I assuming I have to drain the boiler?).

There are TWO flow and return isolation valves (see picture) under the boiler with valves (Allen Key operated) and taps for draining.
I assume I switch off the boiler at the electric mains, turn the valve 90 degrees and open the tap to drain. But which one? Or do I do both?

Then after I replace the pressure sensor do I just reverse this process or is there more to do like bleed air out or open another inlet valve temporarily to allow fill?

Many thanks in advance

Jason


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PostPosted: Fri Jan 19, 2018 5:20 pm 
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Isolate boiler as you have described (4mm Allen key)

Open drain valves, 7mm open end spanner. Both will help drain it.

Remove retaining clip from pressure sensor and pull out. Be ready with old towel or similar as water will still run out.

Remove wiring connector.

Reverse above to fit.

Fill boiler to around 1.2bar

Run dearation cycle on boiler (P0), check pressure is at around 1.2 bar again.

Job done

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Dave

www.drlgas.co.uk


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PostPosted: Fri Jan 19, 2018 11:32 pm 
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Magnificent thanks Dave!!!!


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