So now in the summer with just Water heating I have the problem that my new Valliant EcoMAX Pro Boiler keeps tripping out(Fault 26, possible Pump failure) I check the Sealed Expansion Pressure, and it measures around 0.5 Bar (From a normal 1bar). Its a new Boiler/ pump/ sealed system - less than 5 months old.
So I guess I have a leak somewhere. But nothing obvious.
But since it has occured since switching off the Central Heating, So I switch the CH Heating Demand On, the pressure recovers to 1Bar, and the system is OK. (But I have a hot house) I switch off the Central heating demand,just Water only, and the pressure drops within a few hours, and the boiler trips out.
I don't know how to recharge the system. Instructions says it should be done by installer, which will be frustrating/expensive if I have to do this every few days! - But I do seem to be able to recover pressure if I demand Central heating.
Any thoughts ?
I really wished I kept my old simple Gravity fed system. Lot less hassle.