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This is a term called pumping over. This normally is caused by a blockage of some kind. In my experience this is generally a blocked cold feed. But from your discription it sounds more like the system is drawing in air when the pump is running, and when it stops the air rises to the top of the...

I am thinking of putting a new kitchen in. This will be in a different place to the existing one. The only problem I can foresee is the waste. There is an inspection chamber outside where the new kitchen is to be installed. I can dig a pathway to the chamber, but not sure how to connect the...

Replace the aav then refill. Check for any other leaks, epecialy heatexchanger as this will be expensive if it has cracked. Good luck

You will need to put an anti siphon valve in (air emittence). This will ensure the water willnot be sucked out of the trap

Oil boilers are not our thing, but sounds like you are on the right track. But only you can answer if it is worth doing. If yu can live with the situation then fine, wait. If not change it.

A Wolsley parts center are quite good. If you are close to Croydon then Curzons or Shoreheat are a god bet. Tried your MI for the replacement of the O-Rings

This will be an interal fault to the boiler. See if the fan is working. When the boiler was installed they shld have left you with the Manufacturers Instructions, the fault finding guide should assist you. I woulds recomend a Corgi engineer because the inside of your boiler can be very...

this would need to be scaled up to the extent that it would block under mains pressure. Unlikley

The simplest option for you is to change it yourself. If you are fairly competant with your hands you should fnd it easy. Drain the water out of the system, you dont need isolation points, just run a hose of a draincock and then turn your incoming stopcock off. Turn electrical supply off...

Could be a faulty Governor. The old style have dodgy innards which come loose over time and block the outlet partially. If this is the case you will need to contact Transco and they will rectify the problem, plus it wont cost you a penny. Fingers crossed

This valve wouldnt leak as a saftey measure. I personally havent had any problems with this part of the boiler. The o-rings may not be seated properly which now have been exposed due to increase in pressure as the prv was letting by before. There is a retaing clip on the valve, remove this to...

Has the boiler or your home have a scale reducer. It sounds as though there may be some limescale build up in the boiler reducing the flow rate through the boiler. Most Combi require a minimum flow rate to start the ignition process.

There should be two black valves on the filling loop. If you turn both valves so they run in line with the pipe this will fill your system. To stop filling simply turn back so both are lying accross the pipe. Try to be gentle as you turn it on as it is mains pressure you are putting into the...

How High is your boiler thermostat, If the boiler stat is too high and the boiler is too powerful for the system there is a chance that the Heat Exchanger could begin to kettle (boil). Are the other components on the system very old, it wll be worth checking to see if the pump is working as it...