It can be due to a number of reasons. Most commonly the lack of circulation caused by the pump being too week or even broken. Again, pump failure can be due to a number of reasons.
You should ask yourself a few basic questions about your heating system:
Is the boiler serviced annually?
Whats the age of the boiler?
Has the system been flushed?
What type of system do I have?
Is there enough pressure in the system?
Is there enough water in the system?

If in doubt with any of these basics you should always consult a heating engineer! In our experience it can be very time consuming and expensive to get your system up and running if you don’t use trusted professionals.

Gas can be dangerous and work should only be attempted by Gas Safe registered engineers who have the relevant skills and tools to complete the work safely.
We repair, install, service, and check the safety of all types of domestic gas combination, condensing and back boilers.

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