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potterton combi 80 boiler locks out. ?

If heating on and we use the shower the boiler locks out.we have been told it may be the secondary heat plate exchanger could be getting blocked ,if so can this be replaced. No other ploblems with boiler.
Colin G, December 2010
check shower head is clean if thats ok shower filters may need cleaning sounds as if there's not enough water flowing through the shower

brian, December 2010
link Click here to see other fixes for Potterton.