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hi guys can you help? Our boiler doesn't fire up' and when you switch heating on by the programmer it cuts out completely showing f5 on the display any ideas please? cheesecake :roll:

can anyone help please recently replaced honeywell thermostat,advised to because heating was tripping out since then my valliant condenser boiler has'nt worked,it sparks up for about 10 seconds then switches off again : :( any advice would be greatfully received.