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Troubleshooting common problems

Click on the questions to reveal the answers. Please bear in mind that unless you are a trained professional, you should never attempt to carry out repairs to a boiler yourself. If in doubt, please give us a call.

Boilers

QuestionNo heating or hot water

  • Check if the power supply is on at the mains and that a fuse hasn't blown.
  • Check the gas supply, the stopcock should be open.
  • Check the pilot light is lit. Instructions on how to do this should be in the boiler manual, or printed on the inside of the boiler door. If it won't ignite you will need to call an engineer.
  • Check that the programmer is switched on, and that the thermostats are turned up high enough.
  • If it is a combi or sealed system, check that the pressure is high enough (usually 1 - 1.5 bar). If not it can be manually topped up using the filling loop. Instructions on how to do this should be in your boiler manual.

QuestionThere are loud banging noises coming from my boiler, what's wrong?

Hissing or banging noises from your boiler usually indicates that there is a build up of sludge in the heating system. Give us a call and a suitably trained engineer will powerflush it for you.

QuestionI have just had a new combi boiler installed and the hot water is coming out white and cloudy, whats wrong?

The water from combi boilers is heated directly from the mains and when it is released millions of bubbles of carbon dioxide are formed. This is not sediment and is not harmful. The water will clear if left to stand.

Radiators

QuestionThe top of the radiator is cold and the bottom is hot

When air enters the central heating system, pockets of air rise to the top of the radiator preventing it from heating up. The radiator will need to be bled. First turn off the heating system, and with a cloth underneath to catch any water, use a radiator key to slacken the bleed valve (located at the top edge of the radiator) by a half turn anticlockwise. There will be a hissing sound as the air is released. As soon as water begins to flow close the valve, being careful not to overtighten. If the radiators need frequent bleeding then you will need to call an engineer.

QuestionThe bottom of the radiator is cold and the top is hot

This indicates a build up of iron oxide sludge in the bottom of the radiator, which prevents the bottom from heating up. This can be remedied by powerflushing the system, which forcibly removes the deposits by pumping a solution of chemical cleaner through the system.