vaillant ecotec plus 831 pump speed setting

[wildweasel]

Hi all

yesterday I replaced the old water pump with a new replacement (178983 Grundfos type) as the old pump was making a lot of noise and leaking badly.

Since replacement the pump, I've noticed that the heating although working fine, takes quite a bit longer to heat up. With the old pump, the boiler would starting warming the radiators in a 5-10 minutes (there are 10 radiators). Now it takes 30 minutes or more.

I've not changed anything other than the pump and bled the radiators.

As i'm sure you're aware the pump has two settings, 75W and 85W. So I'm wondering if anyone knows how to speed up the pump? Or if there is something else I've missed.

Thanks
Colin

 

[Bunnyman]

75-85 what on earth are you on about? Where did those numbers come from?

 

[Dan Robinson]

Someone hasn't read their manual eh Bunny?