Hi my boiler is working fine when the central heating only is on but when i turn the hot water on it cuts out, it seems to run the central heating ok during the day but as the temp drops it also cuts out and then no central heatin the lights that flash are 70 & 80 any ideas what this could be and how to sort it thanks

jo, March 2008

all i can tell you is ...no flame detection

dave, November 2008

I have the same problem, the dump valve is operating to remove the pressure because I suspect that the thermostat is overheating. I am going to try changing the thermostat in the next few days.

Jason, March 2008