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OK Following the advice of Tony above, I drained down the system and added some sludge and scale removing chemicals. Then started to re-fill and balance the system again, but struggled... The pressure kept rapidly dropping to 0 as though I have a leak, and then I narrowed the fault down to a...

Thanks for your quick response Tony. We suffer from particularly hard water, so I wouldn`t be surprised if its a build-up of limescale too. All the pipes are copper, and we have 3 TRV rads downstairs, and upstairs we have 3 TRV rads and a non TRV rad. Based on the above info, are there any...

Hi there, I have a Sime Friendly Format 80E boiler (or possibly a Friendly Format Technyl judging by part numbers) which is <5 years old, and have a classic problem... The CH works absolutely fine, but we're experiencing problems with the DHW only being lukewarm AND low pressure - typical...