The saga continues. Still pumping over but possibly less amount spilling over. Yesterday, checked tightness of bleed points. Not all of them as I need a 22mm box spanner for some that have outer cases and I dont have one atm and cant find socket set
. Turned all rads bar upper towel rail off initially, whacked up the room stat and ran up to boiler temp no pumping over. Boiler kettles, opens one more upper rad. No pumping over boiler quiet. Open another rad run heating no pumping over. I carried on with this running each rad up to temp and then moved on to ground floor. No pumping over. Whole operation say two hours. No pumping over bar a couple of drips. I checked the vent pipe in cyclinder cupboard each time I switched on another rad, was warm but not really that hot and cooler further up pipe. Cold feed was ok.
Heating comes on last night and yes, pumps over. What the
This morning significant water on flat roof below outlet.
Could the boiler stat (thermistors Vaillant eco max pro 28) be playing up? Digital boiler panel read out never reads more than 66 deg.
Could there still be some sludge in system? Rads really hot though but.
By pass is working fine.Air separator was removed last year for inspection no blockage to water feed apparent. AAV on HW loop after Motorised valves currently open. I will close it again.
Pump is currently set at lower variable speed and is only 18 months old.
No wonder heating engineers run a mile when told is pumping over.