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the pump flow switch will not require replacing, just tubes clearing (if necessary) as was explained.

:?: when the flowswitch assy arrives you are going to test whether it is required ? or you have tested, found the flowswitch to be suspect & will attempt to replace it ?

you will be lucky if it lasts a day or two.

wherever convenient.

on a combi or system boiler.

so thats the excuse you give when the customer catches you rifling through her knicker drawer.:lol:

doubtful.

it sounds like it wasn't flushed & chemically treated properly when the boiler was originally installed. this is very common when a cheap boiler is cheaply installed. i'm not necessarily putting yours in this bracket, but it sounds an ideal candidate.

the cold feed (cf) you have drawn from your feed & expansion (f&e) tank down to your boiler. i would guess the open vent (ov) comes from the bend (on the diagram) just before the pump & terminates over the f&e tank ? DH asked for the static head distance ? as you have no trvs a bypass...

it sounds like your radiators need balancing. look here. http://www.diydata.com/projects/centralheating/balancing/radiator_balancing.php

take a look at various boiler installation & service instructions. they generally list a sequence of events. also checking through the fault finding procedures will help. theres plenty here to get you going. http://www.partsarena.com/baxi/ flow switches are generally on the water...

i'm being somewhat pedantic here you might think, but copper/brass & galvanised should not be directly joined together on water pipework. a dielectric or nylon/plastic fitting should be used to reduce the steel corroding. then this brings up the question of supplementary bonding i suppose.

the 'cure' will be too involved for diy.

sorry it just gives me a headache trying to read that.

the gland/stuffing box/'o' ring needs replacing.

i mentioned it cause i stuffed mine when i fitted it 4 years ago. probably worth a look behind the panel at some point.

the two bleed points could do with replacing with aavs. the system needs a bypass. are trvs fitted ? a lot depends on exactly where the cf & ov are on the system. is the noise constant, now & again, only when ch on ?

please elaborate. i'm always prepared to learn.

helps keep the bath hot longer, especially with steel bath.