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Thanks for your patience Tony. Shaft moves freely. Valve 0738 (label on back rear of airing cupboard/mirror etc!!) Pump speed reduced to 2 (I'll monitor that) Coil doesn't appear restricted.

Thanks Tony. The valve was, I believe a 'Honeywell V4073A 3 Port Mid-Position Diverter Valve 22mm'. Can't say if it was old stock, but think not. Thought that the valve it replaced may have had dirt on seat but this one has done it from new. As you say it appears to be leaking past...

All pipes hot over a distance, not just close to 3 port valve head (Honeywell can't easily read model). Originally thought that radiators heating up was due to failed old valve. This replaced, like for like over winter. Could it be wiring? Wiring a 'bird's nest' contained under plain...

Yes

Hi, Thanks for posting. The feed pipe from the valve to the Hot tank is hot as are the pipes connecting to pump and central heating. only first 2/3 radiators on system (upstairs affected) dpending on length of time hot water calling for heat

Two or three of the upstairs radiators get hot when the hot tank is calling for heat and the central heating is off. New 3 port value fitted (old one knackered) problem still persists. Inherited problem from moving in. Any suggestions for cure welcome

Thanks for posting replies. Any other contenders worth considering?

I'm looking to replace my oil boiler with one that sits outside the house. I have been advised that a Grant Vortex Pro-Outdoor 15/21 is my best bet. Any views as to price/quality/ reliability of this and other suitable oil boilers gratefully received.