I have a Potterton promax 15 he bolier and every couple of weeks I come down in the morning to a pool of water underneath it. I have had it serviced and no obvoius signs of leaks or water damage can be found, not the condensor pipe so I am being told they have no idea. Has anybody got any ideas ?

chris, January 2009

check the plastic drain cap on the bottom of the siphon next to the condesate pipe under the boiler

Paul the gasman, January 2009