leaking auto air vent valve

[sasik]

If water leaking from the top(red cap) of the auto air vent is the air vent valve is faulty or somthing elss is wrong with heating/hot water system?

Thanks sasi

[Mike Jackson]

Generally muck on the seating of the AAV. Can be symptomatic of corrosion problems in the system.

Mike

[sasik]

so, would you say I should open the AAV and give it a good clean and then run some system cleaner to get rid of all the crap?

Thanks Sasi

[Mike Jackson]

Check the condition of the rest of the system before using system cleaner. No point if it's just a random bit of muck.

Mike