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Or it could be the control box.

Oilman is giving you good advice. Why don't you take it ? For starters you will need to purchase several hundred pounds worth of test equipment and then use it for several months at least with guidance from a professional to be able to sort your boiler out. If there is just a thin layer of soot...

The air intake could be sucking in fumes from the exhaust. When you take the cover of it can breath from the room, hence it runs trouble free. Trace the leak of fumes and seal it up. If its in the flue and new seals can't be obtained seal it up with high temperature silicone.

The frost stat has its own supply of electric i.e. not through the programmer. This, as you say, fires the boiler to prevent boiler and pipes from freezing (which obviously means in other words the heating comes on). You are also correct that there should be a pipe stat on the return to the...

The clue is you can smell oil. If solenoid was duff it would not let any oil through. Check ignition first, then pump pressure. If you've no idea how or lack the tools it best to get some one in.

Check ignition. i.e. spark, electrodes, leads, transformer, control box.

The "T" part of the fuse number means "time delay" so it is a slow blow type fuse.

Yes, it's the wrong way round. Port A should go to the heating.

It may be costly for a tall vertical balanced flue but they work very well and all the flue products are dispersed at roof level instead of in your garden/alley/patio or wherever at low level. Having said that a boiler in your garage has advantages in that there is no oil in the house and the...

Hi folks, help needed please. I have been asked to pipe up from a new underground tank about thirty metres to an existing boiler down in a cellar. The boiler is a big beast of a thing with 156kw input and a riello g20 burner.I don't usually work on systems this large. The tank (5000 litre) is...

Probably not as you have already tried the boiler with the other two switched off and it made no difference.There can't be many more parts left to change, let us know if the NR valve cures it.

Has the motor capacitor been checked ?

No loft, it's one of those where the roof spars have been filled in between with kingspan, plasterboarded and skimmed, so it looks like i'll have to lift a few tiles on the roof to get at it. Thanks for your help, STIX.

the roof being the roof of the house. If i cut a hole in the plaster board above the cylinder i'll be looking at laths and roof tiles. Maybe i'll have to go in through the roof.

One baffle ain't right. Should have a set of at least 3 . Only one will mean a lot of usefull heat dissappearing up your flue.

Hi all, i have been asked to change an old immersion thermostat for a new re-settable one. The current one is in an immersion on the top of a cylinder. The problem is the top of the cylinder is only about 12" below the roof and when i withdraw the old stat there isn't enough clearance for it to...

Have you checked the fuel filter ?

Don,t think that boiler has an MV. Could be a relay, stat or timer giving you trouble.

Fixed one recently with the same symptoms. It was a faulty pump on h/w side.

Spin the valve wheel till it goes slack/loose. In this position the oil is off.Tighten up but not too much (just get some tension on the valve) to open the valve up and allow oil through again. Try it with the filter off and a container to catch the oil so you can see how much to open the valve...