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Thanks for your reply. The hot water will work when the central heating is on or off & not showing the '3' error code - hot water mode on this boiler is started when the hot water tap is turned on. But if I run the hot water for a long time to fill the bath, turn the tap off & try to use...

I have recently had a new Halstead ACE HE24 combi boiler fitted which has a fault. The boiler will heat up the radiators and then stop heating when the water gets to the temperature set by the thermostat. But when it tries to relight 10 - 15 minutes later it fails and displays the number 3...