"But I never quite understood why Electrolux never fitted a piston valve bag indicator in the front bin door to ANY of the Powerlite uprights and have since failed to include it, even on the more recent models." Maybe they realised it was a useless feature as it only indicated a full bag when it was bursting at the seams and didn't have any suction at all, so decided just to save a few pennies on something the user would never miss.
As I said on the thread about piston indicators, I hate them.
The one on my 2008 JMB SC1056 doesn't indicate a full bag until it has no suction at all, the same goes for the bin full indicator on my 1988 Hitachi Powerhouse and the 2000 Electrolux Tango likes to say it has a full bag when it has a brand new bag and no blockages (the indicator is clearly too sensitive for the 1400 watt motor fitted).
They are utterly useless for anything other than identifying a blockage, which even then is still useless because if you had a blockage, you'd know about it without having a little red indicator to tell you!
As I said on the thread about piston indicators, I hate them.
The one on my 2008 JMB SC1056 doesn't indicate a full bag until it has no suction at all, the same goes for the bin full indicator on my 1988 Hitachi Powerhouse and the 2000 Electrolux Tango likes to say it has a full bag when it has a brand new bag and no blockages (the indicator is clearly too sensitive for the 1400 watt motor fitted).
They are utterly useless for anything other than identifying a blockage, which even then is still useless because if you had a blockage, you'd know about it without having a little red indicator to tell you!