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Can't thank you enough. Set boiler to 4, pump to 2. Pump finally shut off! I found an old pipe thermometer which I put on tank next to stat which said 53c on a stat setting of 60c. So one is wrong, but now have enough hot water for two showers or more where as when stat was set at 55c we only...

Pump is a grundfos seletric with settings 1,2&3.

How high shall I set boiler? I have a micro bore CH system and last winter lots of hot drips came into the expansion tank warming the water in it. I have a small cottage w/ 7 rads. CH pipes never been power flushed etc. Pump is set to 3. What do you suggest for boiler setting and pump speed? Thanks.

The boiler is a Potterton Prima F the i in Prima is a 1 with a dot on top like Pr1maF. It's set on 3. It goes from 0 to 5 then max.

Hi all, I hope someone can help. Recently my pump keeps running if cylinder stat set to 60c. If I lower stat to 55c it operates normally. At 60c the boiler shuts off when temp reached but not pump. Pipes to & from cylinder are hot as is valve to cylinder. I thought maybe cylinder stat was at...