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You either have an airlock in the flow or return from boiler to cylinder (have you checked that these are rising to the cylinder with no dips), or the feed pipe between the header tank and the boiler is blocked. Assuming that you have water in the header tank.

Kevplumbs latest posting was on September 4 2011 in Plumbing and central heating re -is this work ok.

Your problem usually happens when the burner pressure is set to high, this will cause flame lift off. meaning that the pilot flame is being lifted off the thermo couple when the main burner lights.

The ACL LP522 pragrammer wirung is as follows- L = Live N = Neutral 1 = HW OFF 2 = CH OFF 3 = HW ON 4 = CH ON The ACL LP111 & LP711 time clock is wired the same but is voltage free so a link has to be fitted between L & 1 to overcome this. It appears that you may have wired the...

Please ignore, misread your post

No it is definetly not supposed to be installed like that, Hope you have an expansion pipe. Install a small head tank and do the job right. :shock:

You will probably find that the small head tank in the attic is empty due to a stuck ball valve. Failing this it could be that the coil is air locked which can usually be remedied by releasing the air with the manual air vent situated at the top of the flow pipe going into the cylinder

Have you checked and cleaned the FFD :?: :?:

Have you checked that the frost stat is set correctly :?:

sorry double post

Fit the swan neck so that is fitted to the left hand side of the expansion tee and fit the short piece of pipe, now fitted to the left of the tee, to the right of the tee altering the expansion pipe accordingly. This will solve your problem.

Looking at the photos, the flow pipe going into the cylinder seems to be rising after the expansion tee and cuasing an air lock in the coil

Was the original cylinder a Primatic :?: :?: :?: :shock:

Connect Brown to L on RAA Connect Yellow to Y1 on RAA Blue not required so insulate and isolate

Any ideas of getting rid of wild yarrow from my lawn please

If you do not have the operating manual,go to:[http://www.plumbnation.co.uk/site/honeywell-st9100a-1-day-single-channel-programmer/] here you can download the manual which will give you a guide on how to set up in the installer mode.

Wiring for the SA1452 and SA 2452 is COMMON = 3 DEMAND = 1 SATISFIED = 2

Direct replacement for the SA1452 is SA2452, what make is the diverter valve as blue is normally neutral.

Sorry Piccaso, I misread it, i`ll go back to sleep.