Understanding and Resolving Blocked Microbore Pipes Microbore pipes, typically measuring in diameter, were a popular choice for central heating installations in the 1970s and 80s due to their flexibility and ease of installation. However, their narrow design makes them significantly more susceptible to blockages compared to standard 15mm or 22mm copper pipework. Common Causes of Blockages
: Good for light sludge but rarely clears a solid, total blockage in 8mm pipes. 2. Manual Rodding and Wire blocked microbore pipes
: Open the radiator bleed valve. If air or water flows out, the pipe is likely clear but airlocked. If there is no draw at all , the pipe is blocked. If there is no draw at all , the pipe is blocked
If your heating system utilizes microbore piping, watch for these "red flag" symptoms: making the job harder.
: If you are installing a new boiler, many checkatrade experts recommend replacing microbore with standard 15mm pipes to ensure the new boiler’s warranty isn't voided by sludge.
The "long piece" you mentioned likely refers to a specific run of pipe (perhaps under a floor or in a wall) that is inaccessible or particularly lengthy, making the job harder.