When I draw hot water, the boiler comes on normally and heats up the water for about 15 to 20 seconds then cuts out. It stays off for about 10 seconds then back on, and so on, water does not remain constant temperature. What is wrong with the thing! Driving me potty!

Steve S, November 2007

The pump is week and does not provide enough water to exchanger .vp5/2 two screws easy to do ! about 100 new, what fault code is there on the display

raj, August 2009

Possible cause would be the hot water heat exchanger being partially blocked.

Mr A, November 2007