what are your thoughts on a boiler flue passing horizontally through a disused chimney that has been decommisioned. the route has been sleeved and sealed with the flue passing through the sleeve. no joints in sleeve which is about 300mm in length.
WORCESTER 28I
PROBLEM HAPPENS WHEN DHW TAP SWITCHED OF. PRESSURE GUAGE JUMPS FROM 1 TO 2 AND BOILER THUMPS. THEN RESETS ITSELF AND RUNS FINE???????????? SOMETIMES GOES TO LOCKOUT AND HAS TO BE RESET??