Chaffotaeux brittony 100 combi

[rob jefkins]

Hi, Need a bit of help with a Chafotaux Brittony Cobi 100 boiler.
Only getting some heat to the closest rads to the boiler. Checked valves, air etc and all ok. Checked the pump and it was really hot although it was spinning freely and vented. DHW okay. Does the pump need replacing???

Cheers

 

[migoplumber]

could be pump or pump speed or air or sludge

 

[rob jefkins]

As far as I know it's a one speed pump. Could be sludge as the boiler runs for about 8 seonds before kicking out therefore the pump must be working somewhat although not very well. Thanks for advice.
Rob

 

[paul H]

doesnt sound like theres any water circulation from the pump / boiler system then getting too hot and shutting down