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The burner is going out (due to lack of oxygen) the photo-cell sees this and relights the burner by starting the ignition sequence again "pop"! This repeats itself so that is what you can hear. Check your air inlet in the balanced flue installation. The flue exhaust gases should exit via the...

You are of course correct OIlman. Its a combi. I am with you now Heatslave. The cover is as per a balanced flue installation. You have virtually cracked it yourself. With the cover fitted, the burner is drawing air from the balanced flue and with the cover removed or loose, it is drawing air...

HeatSlave. Can you tell us what size Heatslave boiler you have i.e. 12/14 or 15/19 etc. Is it a combi, does it have a conventional flue or a balanced flue and what is the burner exactly? There is an identification plate on them. Electro-Oil B9A, B9B or B11 perhaps? It does sound like you...

He tested the photo-cell with his multi-meter and it was OK WDIK. High resistance in the dark and "fairly" low in the light. So the control box looks favourite.

Well done "arfur". The test leads used in your trial were "temporary experimental laboratory test equipment", never mind "elf an safety". Welcome to the Dangerous Brothers "wire things straight in to see if they work then", team!! 8)

Please clarify the "magic eye" seeming to work like a switch. Normally they are photo-resistors. i.e. the resistance changes with the amount of light shone on them. You can usually see a zig -zagged element in them. I take it that you have some form of multimeter? If so, select the "diode" range...

Yes difficult to tell without some history. If you can't get a "man in", start with some sort of systematic checks. Have you got sufficient oil flowing to the pump in the first place? A partly blocked filter can give fuel starvation which recovers after a pause to resupply some more oil. When...

Well done! If at first you don't succeed...hit it again!

Richard, You need to be able to use a multi-meter as though it was your best friend. You and the other posters are right. Get a cheap one at first and practice on batteries etc. Either go to Maplins or send off for a pack of mixed components and practice with them. Learn to read the...

OK kovertk. So far so good. If you open the screw marked "P" on the fuel pump you get just a low flow with some bubbles of air? Normally you get this when the pump is stationary and, for instance, a new flexible fuel hose has been fitted. (This is where we connect in our fuel pressure test gauge...

Did this new pump ever work when you fitted it? The reason that I ask is that it sounds like it isn't turning. If it has never worked, what about taking the pump back off and making sure that (a) the drive dog is in place and (b) that it is undamaged. The drive dog is a plastic "weak link" that...

Yes. Do what Oilman says. You can close the air off a little anyway as it will certainly help. For instance go down one number; if it is on "4" set it to "3".

If I understand you correctly. When you open a cover at the rear of the burner (i.e the flame is pointing the other way?) everything works OK? You can also probably feel air being blown out of the rear of the burner. When you refit the cover then the flame goes out? If so, then the burner is...

Most (cheap) pressure gauges are called "Bourdon Tube" Gauges. The mechanism consists of a curved tube, sealed at one end and connected to the pressure being measured at the other. The tube straightens when pressure is applied inside it and moves the instrument pointer. Fluid visible in the...

Neale, If I were you I'd take the actuator top off again, get the part numbers and order the switches up. You don't want to have Xmas day in the freezing cold being nagged about why you didn't do so and so!!!!!! Anything for peace and quite? Good Luck!

Well nealegray I'm really impressed. I have had many dealings with micro-switches of all sorts in the past. I've opened them to see what has actually happened more than once but I have never repaired one!!! Go to the top of the "I can fix anything" list! Now the chances are that the repaired...

If there is a box in the wall behind the stat with an earth terminal screw in, then connect it to that. If not, put the earth cable into one segment of chocolate block, tape it up and tuck it out of the way. You are using a double insulated component that does not require an earth. No probs!

You are correct. The white is "call for heating" and the grey is "hot water satisfied" so with both energised the valve should go to full heating. At the mid-position the 82 volts is to hold the motor in the valve at the half way point. (If there was no supply at this mid-position then the valve...

Suuget that the Wikisection is amended to ....."a very naughty, illegal, bad idea!" :D

Borrowed neutrals are not permitted. Reg 314.4. "Where an installation comprises more than one final circuit, each final circuit shall be connected to a separate way in a distribution board. The wiring of each final circuit shall be electrically separate from that of every other final...