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any ideas please? didn't change the he cylinder stat as Happened with the CH running as well. from what I've read it seems it can be either the control thermostat or the overrun thermostat or both? any steer would be appreciated so can get gas engineer to fit. thanks

sorry forgot to add, boiler was on setting 2-3, and hw cylinder stat is 50C could it be a dodgy cylinder stat?

sorry been difficult to progress this as dislocated my shoulder Friday night. however, put the thermometer on today and some scary results. with just the hw running as been shut off for a few hours this morning; outlet from boiler reached 104.6 C (when the motorised value closed) return to...

many thanks, thermometer arrived today, just waiting on the aluminium tape to arrive now, can't measure directly above boiler as pipes are hidden behind wall, so will have to do at airing cupboard.

cool, thanks for the thumbs up Pete, as already ordered it ;-)

had a look round, seems amazon has one which I can get delivered on Friday; http://www.amazon.co.uk/Digital-Thermometer-K-Type-Sensor-Temperature/dp/B00DIUOEDI/ref=pd_sim_sbs_diy_8

many thanks Tony, will buy a couple to verify, might be a bit difficult placing close to the boiler, as not much clearance at the top, plus would need a ladder to take the measurements ;-) cheers Adrian

no worries, will get two thermometers, something like; http://www.heatingcontrolsonline.co.uk/clipon-pipe-thermometer-p-644.html?gclid=CJudt-63iboCFbIPtAod734ANw should do the trick, presume this needs to be in airing cupboard rather than above boiler, two crude photos attached (sorry bulb in...

sorry just saw this when trying to find out what the air vent was called, also have one of these on the loop to boiler (i.e. where the water loops when the ch & hw motorised values have shut down); http://www.plumbase.com/tprod75121/section1821/hwell-ang-auto-bypass-valve-22mm-du145.html...

many thanks Pete, think its a 100e, that seems to be what is mentioned on the lower plastic tray of the boiler when I ripped it off last week. the pump was replaced same time as the overhaul, it's a Grundfos 15-50. it seems to be whizzing round fine (can hear difference in spin when using the...

Many thanks Tony, the system hasn't be serviced since it was overhauled back in 2009 (got heating company to change from gravity to fully pumped, change a few rads, add a room stat, tlv's, magna clean, inline inhibitor, etc) think it was overdue a good clean ;-) thinking about replacing the...

many thanks bazdaman & Tony, I've drained down system added x800, kept in system for around 8-10 hours, the wife and kids said it was too hot when I initially ran it for a couple of hours (target temp was 30, but was unbearable at 26.5) so turned heating off. Drained down system this morning...

Hello, sorry this is my first post, but from the articles I’ve read you all seem to be a helpful bunch. I’ve got an old open vented pumped system. It was completely overhauled in 2006, over the last couple of weeks the potterton profile 100e has been tripping the over heat sensor, and having to...