Ariston e-combi 38, Pump constantly on

[MaksimsK]

Hi, could you help me to solve mysterious stuff happening with Ariston e-combi 38 located on the loft

• Can hear the sound of the boiler pump in our bedroom. If I come closer to the boiler, it's not sound so bad, but in bedroom you can hear it a lot.
• pump is running even with room stat turned off. Could run for hours. But sometimes can stop for no reason.
• separate thermometer near roomstat shows 22, stat set to 17. Boiler is kicking in.
• some of radiators is not heated evenly, only top. Actually 5 from 7.
• shows the error: insufficient circulation

Any ideas?

Replace pump, sludge - powerflush... Those were my thoughts

 

[ShaunCorbs]

If the pump is running need to look at what’s controlling it eg do you have switch feed into the boiler if not I would be looking possibly at pcb

 

[AMGasServices]

It may be the anti frost device telling the boiler to fire up.