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Does the pump respond correctly when you change the speeds; does it vibrate, is it noisy? Removing the large slotted screw in the centre of the pump will only bleed the pump as hardly any water will come out following any air. The system does vent into the F&E tank in the loft. The vent...

HW (primary) circuit should have cylinder heating coil upstand bleed on flow to cylinder. Clanking/knocking/kettling is usually circulation fault. Check level of water in F&E tank, pump integrity/speed, air in system, blockage due to crud. Is noise caused by steam and water venting into F&E...

Do you have two tanks in the attic? Large one is the cold water storage tank for water consumption, smaller is the feed and expansion tank for heating. Bleed or drain water from downstairs rads to ensure water from F&ET will fill system.

Re-reading your post it doesn't state that you have a 3-port valve, but if you have it will sit on top of a copper pipe tee. Probably just after the pump, near the hot water cylinder in an airing cupboard.

If you have a mid position valve there should be a lever at one end that will allow the valve to be set at mid position by moving it across fully and hooking in up into a recess. The hot water and heating will then be driven from the cyclinder stat. Once that stat is satisfied hot water and...

Switch off the electrical isolator to reset the motorised valve. Turn on the isolator, select "hot water only" on the programmer,turn down room stat to min, make sure cylinder stat is calling. Boiler will fire, put your hand on the hot water cylinder side of the motorised valve about 12...

Boiler stat still set to Max, yes? To find out if the fault is with the boiler or the external controls you need to know whether demand from the room stat is providing a switched live to the boiler via the MV by connecting a voltmeter to boiler SWL terminal. "Boiler on" light; is that a...

Further to TOYBOY's advice, test your stats. With the boiler control stat up to max, switch room stat to min, cyclinder stat to max; does boiler fire? Switch cylinder stat to min, boiler will shut down, switch room stat to max; does boiler fire? If so, see if boiler stays on long enought...

[Stats, roomstat on wall-down, boiler-leave alone, cylinder stat-up. What happens? If the boiler doesnt fire then there are some electrical checks you can carry out if competant and have a multimeter. Yes, leave boiler control stat on high. You have an S Plan system, with two, 2 way MVs...

Just to expand on Hugh's excellent advice. Turn down room stat to zero and turn up cyclinder stat high. Does boiler fire? Is there a demand light on the front panel? If not you need to check for the presence of a switched live.

Many thanks to David for explaining that in simple terms. Very useful. Even I could understand it.

Jimbo, you need to confirm that your boiler requires pump over run; do you have the manual? If it does, confirm that the pump does not continue to run after the boiler shuts down. You then need to make the pump run independantly to see if it prevents water from boiling and expanding up...

Very often the tread on the outside edge of the tyre is not testable although it may be within the central 3/4. If, when it was moulded, the outer tread was not as deep as that tread which has the wear indicators it is not within the testable area,

In future take your vehicle for MOT one month before it expires.

Seems that your pump has lost its ability to continue running for some minutes after the boiler has shut down, This pump over-run is generally controlled by a pump delay thermostat which is located on the side of the heat exchanger within the boiler case. (I am not familiar with the Ferroli...

When that rad gets cold (assuming boiler and pump are still running) is feed pipe also cold? Any krud will form a pyramid at the bottom of the rad and thus be cooler in that area and be hot at the top (unless it requires bleeding). Is the lockshield end of that rad open?

If you are handy with bucket and spanner, loosen valve connection to downstairs radiators to check flow on flow side and then return side. Then close valves, drain radiator, remove it and hose it through in garden. Slop out and clean F and E tank, add sludge remover, drain after suitable...

If you get a strong head pressure of water out of all rads and the HW circuit upstand bleed one would assume that the sytem is full and not blocked. Turn pump up to full speed: have you bled it? Boiler overheat stat may be shutting down main burner if there is not adequate circulation...

Override the clock on your programmer so that HW and CH are on. Set the MV to manual via the lever (this will lock it in the mid position). Turn the room stat down to zero and the cyclinder stat up high (to 65). Boiler will fire. If both outlet pipes from the MV (one to the HW coil in...

Did you sort problem out? "OK - I have the right pipe/valve now. What do I need to do to sort out the balancing?" This is the HW circuits version of the radiators lockshield valve and will reduce the HW flow and give bias toward the radiator circuit when MV is in mid position. If you...