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There are only 2 clocks on the boiler, a pressure gauge and a temperature gauge.

There is no room stat fitted come on guys any ideas.

When the rads go cold the boiler still shows 1.5 bar pressure(drops to 1 bar when boiler is off) the temperature gauge drops from 80 to 40, we can still get hot water from the taps, all tvrs are set to 5, (there is no room stat) any ideas guys i`m at a loss.

downstairs rads take longer but also go cold.Pressure is 1.1bar. all TVRs set at number 5. thanks for the reply

after my vaillant combi has been running for about 2 hours the upstairs radiators go cold , the boiler is still on and working. if i switch off then back on it`s ok for another 2 hours. there is no model number but i think it`s about 5 or 6 year old. any ideas guys. thanks