Thanks ChrisR.
Vent pipe outside is dry and no evidence of discharge.
Rad stems seem fine.
Think I may have found problem though. Magnaclean lid is leaking and is tracking down the casing but not always noticable because of evaporation.
Have collected approx half pint in 24 hours so...
Hi all this is my first post so here goes.
Recently had new Baxi duotec 28HE combi and all new rads (9) to replace 30yr old gloworm gas guzzler. House now heats up much quicker but seem to have a slow leak on system somewhere?
System has been topped up / repressurised about 4 times by me...