My Potterton Netaheat 10-16 has been emitting steam from the vent pipe for a few weeks. It steams for a few seconds each on cycle. Turning down the boiler temperature and turning up the pump flow rate helped for a while but the steaming is getting worse again. I added two 1 litre bottles of Sentinel X400 sludge remover 4 weeks ago to no effect. What sequence of actions should I consider next please?
it could be a faulty thermostat causing excessive overheating...thats what the fault was with mine,
Gordon, December 2006
extend open vent high in to loft then back down over jockey tank.turn pump down put elbow in o/v
paul, December 2006
check your f/e tank feed pipe from tank to system is not blocked. and turn the pump back down. did you drain the tank down before filling with x400 then top back up.
