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Thanks Chris R So I should replace the safety pressure release valve also repressure the expansion. Do you use normal air and to what pressure for this boiler. So you do not think the heat exhchanger is blocked ? Thanks Glenn

The boiler is an Ariston EuroCombi SX 20 MFFICE the problem is when we switch the Domestic hot water on in the morning, the water does not get hot, on checking the boiler is not coming on when the hot water tap is turned on. On checking the heating water pressure it dropped below 1 to 2 bar on...