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OK, this is indeed nothing about coding but information on this for a lay person was not easy to obtain (at least reliably) so documenting it.
Firstly however this is my random findings, your situation may differ and in no way should you attempt this work yourself unless you are sure you are competent enough. I do not encourage or suggest anyone does this work and you should look to employing a tradesperson.
My old boiler is the 110-150 model and parts for it are now not available, at least under all the original parts numbers
My issue was the unit made loud noises when running, clearly an issue with the fan or the motor.
BEFORE DOING ANY WORK ON THE UNIT DISCONNECT THE POWER TOTALLY AND SHUT OFF THE OIL SUPPLY AS CLOSE TO THE UNIT AS POSSIBLE
In my situation the motor itself was the problem, this is obvious if you try to turn it manually and it feels harder to turn that a new motor does, I am guessing in my case the bearings were worn out since the motor itself was trying to work and over a period of time the noises escalated.
My model had a motor listed as 3007355, this part is not available any more but I did get conformation from the manufacturer of the motor (Riello) that part 3007971 is a substitute version. For me I have found this to be the case but note that other models may used other motors so check for yourself. The info plate on mine was
The fan (impellor) for my unit was available easily as part 3005788, THIS DOES differ by model according to the exploded diagrams I have so anything but the 110-150 will have a different code.
TOOLS NEEDED
12mm open ended spanner
hex keys, ideally long and short ones
philips head screwdrivers, ideally long and short ones
To replace the motor you need to disconnect it from the unit and from the fan and oil pumps, the motor runs both the fan and the oil pump for what I guess is a safety measure, no fan running no oil being addeed.
DO NOT EVER RUN THE UNIT WITH THE FAN PULLED OFF. Flames will shoot out the side of the unit if you do.
behind the oil pump there will be a small pipe that needs to be removed, unbolt the connector and carefully pull it out from the socket.
In my case the oil input pipe (connected under the pump), was flexible and so I did not have to remove it, I don’t know if anyone has a solid pipe for this, if you do then you need to remove it as well.
The oil pump is secured by a collar to one side of the motor, There are 3 bolts that act as grub screws that need to be loosened (I only had 2 but there are 3 holes around the unit so I assume there should have been 3.
Once you loosen these the pump will pull away from the motor and you can move it out of the way without needing to disconnect the wires.
The other side of the motor has the fan housing, there are 3 bolts to attach this, so these should be remove and one side of the housing can then be removed.
This will then give you access to the fan, this is attached to the motor by a grub screw, on one part of the impellor there is a small round hole between the blades, this marks he position of the grub screw and you can loosen it with a long handled hex key.
I have never founds it easy to remove a used fan so I have a fan puller for that task, this needs the grub screw removed not loosed and then the puller itself has several grub screws to attach to the fan and then a bolt that tightens and forced the fan off.
once the fan is removed, there are two hex bolts on the motor side of the fan housing attaching the motor to the housing, these can be removed and the n the motor will detach from the unit (with the wires still attached at this point.
Here is an example motor with the mounting points ringed
Once the motor is disconnected you can basically reverse the process and attach the new motor and reattach the pump, a new fan blade and the oil lines.
This then leaves the wiring, for me the motor has 4 wires and were the same colours as the old motor and so I found it easier to remove one wire at a time for the old motor and reattach the new one, then move on to the next.
You need to remove the burner control box, this is the bit above the motor that has a big red button on it. There is one screw to the side that you loosen and then the box pulls out to reveal the wiring connections.
You can the wire up the new motor while disconnecting the old one.
FOR ME THIS WAS
Once you have done the wiring and everything is back attached you can switch back on the oil supply, the power and you will probably need to bleed the oil line a bit or go through a few start/lockout sessions.
