Boiler swithes off after 2 minutes

[warren brown]

My Boiler (Ideal Mexico - Super FF 2000) will switch off after only a short time and then will not start up again until it has been left a while.
I have experienced problems since moving to house in October (Heating system previously dormant for 6 months) I have circulated and flushed the system with Ferox, taken off several radiators and emptied out sludge. I have recently freed the thermostatic valve on the final two radiators resulting in the heating system being fully operational for the first time. Two days later no heating at all.
The pump is working (have removed and inspected) I guess I have a sludge or an air lock problem but cannot find it.
Please help.

 

[HarrogateGas]

I think that boiler incorporpates sensors. Ive changed a few sensor kits for exacly that problem.

 

[warren brown]

Do you think a build up of sludge will have affected the sensor. Why would the sensor break down now?

 

[dal5band]

Sounds like a flow problem - I've read on these forums of things like "powerflush" or mains pressure up the drain cock for a few seconds. Don't overflow your header tank.

 

[warren brown]

Thanks - I will try the mains pressure up the drain cock. would it be worth putting in some sludge remover as well. Will this stop the boiler cutting out?