Chat with us, powered by LiveChat
Boiler Fault Finder

Blocked plate exchanger

Waterways restricted with debris accumulation (rust/magnetite) Scale formation (hard water areas depositing calcium carbonates) Filter blocked (sometimes located on the primary inlet to protect the plate exchanger from waterborne debris accumulation) Electrically isolate boiler / system controls Isolate the cold, flow and return valves beneath boiler. (If water starts dripping through the glands of any of the isolation valves, they should be replaced, which then requires a full system drain down)! Always check to see if the cold isolation valve shuts off the cold supply to the boiler by opening a hot tap and drain water contents via any built-in drain valves within the boiler.  Alternatively soak up the draining water with absorbent mats /towels, taking great care not to damage any electrical components. (Do not use the pressure relief valve as debris accumulation may get caught on the valve seat and cause continuous leaking). If water continuously runs from the hot water taps, isolate the main incoming stopcock – the cold valve beneath the boiler is faulty and will also need replacing Note: Due to the design of some boiler models, access to the plate exchanger may only be achieved by removing other internal components first. Should this be the case, always ensure you have prior arranged all necessary o rings or washers as replacing these parts with the existing dirty o rings or washers are likely to encourage further leaks. – Any necessary washers/o rings can be easily accessed via purposely designed computer software, found in any of the large plumbing/parts suppliers Unless power flushing the existing plate exchanger with purposely designed adaptors and chemical flushing agents, then a new plate to plate heat exchanger is needed, not forgetting the new lip seals, (which may need to be ordered separately depending on the manufacturer) Refit the plate to plate heat exchanger with the new lip seals, and other internal components (if any) and re-establish cold supply first Open slowly the return valve beneath the boiler, whilst at the same time re-pressurising the boiler via the filling assembly up to 1.0-1.5 bar (filling loop may be built-in the boiler or located remotely) Open the flow valve beneath the boiler and thoroughly inspect for any leaks (especially all the connections which had previously been stripped down) Re-establish power to boiler/system controls Run hot water and heating ensuring all air is fully purged from the primary circuit (via the pump head vent plug, unscrew plastic caps on air vents)…

This content is for Annual Subscription and Annual Subscription Special members only.

Please login to view this content. (or Register here.)