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I have just check the voltage at modureg valve, pins 30 and 31, when the heating is running the voltage is steady at about 14 to 15 volts but when I turn on the hot tap to call for DHW the voltage varies from 4volts to 19volts in large jumps is this normal, the manual say it should be between...

don't know how they cleaned the venturi, but if it was that it would lockout on heating that still work ok if i reset the boiler after it locked out on DHW

System run ok for about 1-2 minutes you now just enough time to get into the shower and get your hair wet before it goes cold, the last engineer said it was not overheating and the first engineer tested the thermistors and did change DHW for the CH worked ok for 2 days before it started doing it...

Can anyone help I have had 2 engineers to look at my boiler but it's still not right, it has an intermittent fault that keeps locking out only when using DHW it’s fine if running the heating but when I turn on the hot water after about 1 minute it lockout, I reset boiler heating work ok again...