Hi,
anyone out there help and advice very much apprecited. tried 2 companies now and wont cover on heating cover also local plumber
said cant get parts. the system has failed to start twice in past 3 months,but started again when re-set pressure. Now the tap or pipe outside ?overflow tap is leaking/dripping hot water when heating is on? ANYONE KNOW WHAT THIS MEANS AND WHERE I CAN GET PARTS?? system installed 1996,last serviced May 2007.
thanks help++==

MRS SUSAN WALES, February 2008

If you have water dripping from the 15mm blow off pipe outside there are a number of possible causes.
1. The expansion vessel inside the boiler has either lost its charge of air or it's membrane is split, so you possibly need a new expansion vessel. Depending on how the boiler has been sited will depend on whether the boiler needs to be taken off the wall to replace this part.
2. The pressure relief valve could be worn allowing water to pass to outside and causing pressure loss to the system.
3. The filling loop could be passing.

First thing to do is to ensure that the boiler pressure is set to 1.5 bar when cold. Turn on the heating and watch the pressure guage. If it rapidly rises up towards 3 bar then the expansion vessel is definately at fault.

Gas Technical Services, July 2008

If you have water dripping from the 15mm blow off pipe outside there are a number of possible causes.
1. The expansion vessel inside the boiler has either lost its charge of air or it's membrane is split, so you possibly need a new expansion vessel. Depending on how the boiler has been sited will depend on whether the boiler needs to be taken off the wall to replace this part.
2. The pressure relief valve could be worn allowing water to pass to outside and causing pressure loss to the system.
3. The filling loop could be passing.

First thing to do is to ensure that the boiler pressure is set to 1.5 bar when cold. Turn on the heating and watch the pressure guage. If it rapidly rises up towards 3 bar then the expansion vessel is definately at fault.

Gas Technical Services, July 2008