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Water dripping from opening at top of pump?

I've got a Vaillant thermocompact that keeps losing pressure. There is water dripping from what looks like a small sticking up outlet on top of a small cylinder attached to the top of the pump. Any ideas what to do to stop the drip ?
Cheers

Rich, April 2015

home Fix label Heating label_important Home Heating Systems category Vaillantdone

It call auto air vent which is jam up ,drain system out when empty pull out pin which hold down air vent get new and replace

ltd, April 2015

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home Fix label Heating label_important Home Heating Systems category Vaillant

Water dripping from opening at top of pump?

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Water dripping from opening at top of pump?

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Water dripping from opening at top of pump?

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