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So are you saying you have oil at the burner but it's still not firing up?

In my experience mice don't normally set out to eat cables. What happens is that they establish runs through the inter floor space and if they find an obstruction then they chew through it to clear the way. Best to set snap traps where you can plus find out where they are entering and seal that up.

You could try taking the radiator outside and flushing it out with a hose pipe.

You could try taking the radiators back off. Stick buckets under the wheelheads and lockshields and crack them open one at a time to check check for a goodly flow.

Could be air entering the oil feed.

Back in the day we didn't worry too much about ventilation for fossil fuel burners because there was always enough air entering the house around windows and doors etc. These days with hermetically sealed homes a permanent vent is an absolute must for any non room sealed appliance.

The only time I have seen two pumps is where there was a tee off the primary circuit that fed distant radiators and towel rails.

I don't believe you can legally connect a boost pump to a rising main. As I understand it you would need to install a water tank in the attic to create a break between your water system and the rising main in order to prevent backflow. You then connect the boost pump to the outlet from the tank.

There are several online resources where you can order a replacement. The problem is there are dozens of them available all with slightly different dimensions so you will need to measure the cartridge very carefully with a Vernier calliper in order the correct item.

Tell them they shouldn't be billing you because your water comes water from an underground aquifer. They will send someone round pretty quickly.

If re-routing the pipework doesn't fix the problem then it might be down to biological contamination inside the machine drum. You can get proprietary cleaners that will provide temporary alleviation if that's the problem.

I remember back in the day when I used to work on aircraft they had devices called 'hydraulic fuses'. If there was a hydraulic leak anywhere downstream then the flow rate went up and the fuse closed shutting off the oil. They were simple mechanical devices with no electrical parts. I just wonder...

Thanks for that John. I will order one of these for my next service.

Hello chaps I have always serviced my own Potterton oil boiler and in recent times seem to have increasing problems with the Riello flex hoses that connect the oil supply to the pump. They just don't seem to last any time at all these days and quickly start leaking where the end fittings are...

I am not playing around and I am trying to get it sorted. That's why I am asking questions. I would gently suggest that is how human beings progress. When we don't know the answer to a problem then we ask people who are more knowledgeable than ourselves.

I know all the water pipes in the house were bonded together in the attic when a shower was fitted. Would that mitigate the risk?

Would that enable me to determine if the earth route through the spike in the ground is is performing to specification? Regard Stuarts

Thanks for your very clear explanation John. I guess to test that is going to be way beyond the capability of my ten quid multimeter.

Thanks for the reply My understanding is that a fault current will always take the best route to earth that is available. So, if you had a situation where a fault current is earthing by an alternative route, like a rising water main, then does it follow that the designed earth route would be...

Thanks for the reply. I've unplugged everything that can be unplugged and still seeing around 100mA when clamping at the meter tails but haven't had a chance to delve deeper at this time. Just wondering if moving the main earth from the spike in the ground to the water pipe, as a temporary...