There are usually a few signs that the central heating system requires cleaning, some can be easily diagnosed by the homeowner and some will require a professional opinion. If you are in any doubt, please contact us and we are happy to provide a free, no obligation quotation.
If your central heating radiators have any cold areas whilst the heating is on, either at the top or the bottom, this is usually a sign that corrosion has taken place within the system and treatment will be required.
Cold areas at the top of a radiator usually indicate a build up of gas within the system. Sometimes this can be air and a quick bleed of the radiator will remove this and cause no further issues, but sometimes this gas can be hydrogen which is the by-product of corrosion within the heating system. If the system frequently needs venting, either there is a small leak on the system drawing in air, or corrosion is constantly happening within the system and this will then need to be assessed.
Cold areas at the bottom of the radiators usually indicate a build up of sludge/debris within the system. As the middle of the radiators tend to be low-flow areas, the debris settles there and over time accumulates to block the lower part of the radiator causing cold areas. If left untreated for long periods of time, the debris will also begin to accumulate in the radiator valves and pipework. When this happens it can, in severe circumstances, cause the whole radiator to be blocked and may require pipework and/or radiator replacement.