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John, You first need to get good access to the Diverter Valve. Switch of the electric supply and remove the fuse. remove the screws and move the upper electrical control panel out of the way. The actuator is fitted to the Diverter valve with a "bayonet fitting." There is a button on the...

Its as Oilman says. According to some notes that I have, if the photo-cell sees "false light" or the fuel solenoid resistance is incorrect or the 50volts that the motor / generator supplies to power the Control Box is missing then the motor will run forever. 1. Get a multimeter and check for...

If the gas pressure in the expansion vessel was too high then I think that for the water to move into the expansion vessel it must therefore be at a higher pressure than the design pressure and so there is a risk that the pressure may rise above the PRV setting and then dump overboard. So in...

I'll have a go Jack but I ain't a plumber. I take it that you mean the gas pressure in the expansion vessel leaking? If so, it can only be a) the Schrader valve in the pressurisation connection leaking or b) the diaphragm that separates the gas from the water leaking. In the case of a) it can...

I'd better say it before someone else does. DO NOT EVEN CONSIDER AVGAS!!!! It is 100/130 Aviation gasoline. i.e. really serious petrol!!!!

I think that Avtur or JP1 or JET A1 Aviation fuel is a kerosene based fuel. Avtag is a wide-cut gasoline based fuel. Do NOT go there. Avcat is a low volatility fuel for use in shipborne aircraft. I don't know about Avtar. Isn't that one of those little piccies on a computer? Either way...

I had a couple of faults on an Advance some time ago. Mira suggested renewing but I tried to repair it and in the end gave up and fitted a Mira Sport from Screwfix. According to Screwfix, they can no longer get the Advance. Plus the Sport is much less complicated and much cheaper. Customer was...

Your mind's wandering again, Ban-all! :lol:

Eric, Sorry I don't quite understand your last sentence but 28 sec is heating oil (i.e. kerosene) and 35sec is gas-oil (i.e. diesel). I believe that 28sec gas-oil is a contradiction in terms. I am suggesting that the OP gets his boiler converted to 35sec gas-oil by increasing the fuel...

When you buy 28sec heating oil the VAT is only 5% for up to 5,000litres which I believe is similar to 35 sec Gas Oil. ( The Red Diesel that farmers use.) I believe that the comments about starting on petrol and then switching to kero can work, provided that you switch back to petrol before...

You need to wipe the pump with paper towels until it is perfectly dry. Then watch for the leak. If the inlet and outlet connections of the pump are tight then make sure that the pump end-cap screws are tight. (normally 4 off Allen screws). Make certain that you know where the leak is and if it...

Well done coleiane! Ta! but I don't need any help with my computer. As I am self-employed and therefore my own IT department, I can throw the PC out of the window into the garden on my own!

Andy, Hope that you got somewhere today. It is "fairly normal" to not be able to get heating without hot water selected. The logic behind this is that normally we need hot water all year around and then in the winter we have an additional requirement of central heating. We do not normally need...

No...cos they are dead! 8)

Correction. When the cylinder thermostat changes over because the water is hot enough, the 3 way valve goes to the central heating only position NOT hot water. Sorry!

Andy. Your Central Heating / Hot Water programmer has two outputs one to hot water, which you are getting and one to the central heating system. This heating supply should go to your Room thermostat (if you have one) and then to the white wire of the 3 way valve. If you have both hot water and...

Dave, I'm near Cirencester. I don't do plumbing, just servicing oil boilers and cookers (AGAs etc) but as I'm of the Electrical faith and often a heating fault is notified as a suspect boiler, I get to do a bit of fault diagnosis but I try not too get wet!! (sorry I posted this on my profile...

Andy, I posted something on your profile. I need to work out how I can send you some information. i.e. a file

Andy. I have an Adobe acrobat file that shows the variuos states of a 3 way valve including a description of the cable colours. I need to find a way to send it to you. Regards, Oillecky

If you have a "conventional" system with a nice hot water cylinder to keep clothes warm and a simple fill & expansion tank in the roof, why change to a complicated combi? If you are not in a soft water area you'll also need a water softener to prevent the combi's heat plate filling with...