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Central Heating

Central heating boiler pressure 'slowly' dropping

Hi. I'm hoping you might be able to offer some help with this. Basically, I have a combi boiler and have noticed the pressure has been dropping. I filled it to 1.5 about a month ago and it has now dropped to 1. There are no leaks coming from the radiators although there is a slight dripping from the main external pipe. Is this something that I should be worried about given how slowly the pressure has been dropping

Many thanks for any advice you are able to offer

1 Answer from a MyBuilder Heating Engineer

Best Answer

The drip on the external pipe is from the 'pressure relief discharge pipe'. Chances are the pressure relief valve will need replacing, especially if it is left to drip for a long time. This will cause the pressure to drop in the system and result in the boiler over heating from lack of circulation. This is a simple job that needs fixing before it causes bigger problems. In extreme weather the drip can freeze and eventually cause the pipe to be blocked by a plug of ice. This then can be potentially dangerous as the pressure relief valve is a safety feature and should under no circumstances be capped off!


Answered 19th Dec 2015

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