As soon as pump failure occurs water flow stops and radiators become cold.

Diagnosis

The pump is the heart of the central heating system and can be prone to seizure and failure. The formation of hardness scales, black oxide sludges and, in systems less than 6 months old, corrosive flux residues, all increase impeller, shaft and bearing wear.

Remedy

Cleanse with either X300 System Cleaner, X800 Jetflo Ultimate Cleaner (preferably with power flushing) or X400 System Restorer. Use X300 for new systems and those up to 6 months old. In older systems, power flush with X800 Jetflo for a rapid and improved clean. Alternatively circulate X400 for 2 hours around the system. When cleaning badly fouled systems with X400, a longer period of circulation (up to four weeks) or power flushing is recommended.

Treatment

Once the system has been cleansed and thoroughly flushed, refill while adding Sentinel X100 Inhibitor which will protect all system metals from corrosion, minimise iron oxide sludge and prevent the formation of hardness scales. Fitting a Sentinel System Filter on the heating circuit provides added protection for the pump.