Most of us across the country felt bone-chilling freeze over the last fortnight. Due to sustained heavy snow and the subzero temperature plunged the thermometer further causing my boiler to go kaput last night.
I found myself without heating and hot water as my 10+ years old Worcester Bosch Combi boiler decided to give up ghost. After a cold night, I received some technical support which might come in handy if you face a similar situation. This might save a trip from the gas engineer, especially in covid restrictions.
The (frozen) condensate in the flue is the main culprit for the boiler to pack in this weather. Due to the fail-safe mechanism, the boiler shuts down till the emission can be detected again. A hot water bottle and/or reasonably hot water (not boiling) is a good rescue trick to melt the frozen condensate. Once the water has thawed your boiler will start working again.
Secondly, you would have to reset the boiler so follow the instruction manual for your respective boiler. In my case, it was holding the reset button for three seconds after complete power off. Additionally, adjustment of pressure might be required - again follow the instructional manual for your boiler.
Lastly, I learnt in my frantic research to arrange a replacement boiler that the flue replacement is now a legal requirement when changing to a new boiler. Do check this with your installer if you are planning to get a replacement sometime soon.
I hope this helps!