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Thanks for your help Mick. There are two gate valves - one at the cold feed to the expansion tank and one at the bottom of the hot water cylinder. Both valves are turned fully to the anti-clockwise position. I'm reluctant to fiddle with them in case they jam shut. Does the gate valve at the...

Do you mean a zone valve or gate valve? Thanks.

Ideal icos condensing boiler fine when both central heating and hot water in use. When calling for hot water only, the boiler fires and after about 4 minutes choking and clunking noises are heard from boiler in addition to occasional slurping sounds from the hot water circuit. Water is then...