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I have solved the diagnostic problem. It seems the DTC Fault 02 is generated to give an initial indication that there are some faults. Scrolling down however I discovered two other fault codes PO139 and P1147 that both relate to the oxygen sensors at the back of the cat. For the moment I...

A few days ago my engine management light came on. But with no other indications or signs of any malfunction. I have a cheaper OBD2 indicator and went and got it and plugged it in. It came up with an indication of DTC Fault 02. Unfortunately nothing I can find on the internet indicates what...

Generally a bayonet fitting is accepted as a safe way to leave an old cooker connection point. But if unlikely to be reused better capped off. If a DIYer is worried about them leaking then it is possible to buy a small aerosol spray can of leak detection foam into the socket and watch that it...

Most boiler weather sensors are about 10k ohms. Thats 10,000 ohms.\ Are you sure you are quoting us the right meter reading?

Try this? Thttps://www.youtube.com/watch?v=misLZrBElC4

I am wondering if you guys are properly setting up the boiler to use weather compensation. This video seems to cover the procedure.

I would have thought about £800 is fairly reasonable for a boiler installation in a loft. Perhaps slightly less in a simple ground floor location. Usually it is possible to push a flue out from inside with a rubber gasket sealing the outside. Not ideal as better sealed with cement but it...

As I recall you do need to set up the weather comp setting on the boiler front panel. Should be covered in the service manual. Or searcheable on the Viessmann web site.

You could measure the resistance of the weather sensor. For Viessmann about 10k typically if I remember correctly. More likely to be a connection somewhere rather than a faulty sensor.

I do not enjoy working on those parts on a Worcester. Went to a friend who needed a right hand block and I suggested he asked for their fixed price repair at about £330. He was so lucky because the combustion chamber had been leaking some brownish stuff. The Worcs guy replaced the RH block...

My friend tookhisFord to the main dealer for a free DPF software upgrade> He had also agreed to a £190 but unspecified diagnostic check! Well nothing was discovered on the dignostic test and they did not make any charge. And the test was done by a 30 y.o. female. He thinks it may have only...

Maybe you need to consider who fitted it and how long ago. It is only a small amount outside the specifications and not something that I would expect would upset anyone. The regulations are written to be complied with but there are no drainage police going round with flashing blue lights about...

His Ford Focus does use the DPF cleansing system but he does not know when it does the regeneration. I thought it might give an indication. He does about 80% of his mileage on motorways so I would not expect the DPF to get very blocked. His engine has only done 66,000 miles. There is a...

A friend of mine has this problem on his car. He thinks it is a common problem on his model. He thinks that it is related to the car's automatic procedure for cleaning the particulate filter! But I am rather sceptical about this as there seems to be little information available on the...

So when it is running which pipe at the boiler is hottest? The flow at the top or the return at the bottom?

Normally described on boilers as an irregular rapid knocking noise. Usually caused by calcium deposits within the main heat exchanger. Most common on older boilers with cast iron heat exchangers. Usually easy to cure with the right chemicals and a little experience.

I do not recommend that as it can get forgotten and complicate anyone coming to deal with it correctly. But it does work for anyone without a compressor. But then I always carry a compressor with me. In practice boiler PRVs rarely get checked. But they are pretty reliable and usually do...

I would use hydrochloric acid at about 7% for cleaning plates. Usually using two applications of the acid. Sometimes warming it up to about 30 C and particularly moving it around quite a lot.

My way of thinking is that it is likely to be an electrolytic action. This can often be caused by faulty wiring causing currents in earth wires. My first check would be with a clamp on ammeter on earth connections around the plumbing.

Alls well that ends well! But I don't understand your original reluctance to go and have a look in the loft. Nasty cold dark places I know but all the evidence pointed to a problem up there!