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the system has had sentinel 100 added i know for a fact, years ago though. on top of that, when the rad is vented, the water is very black that comes from it. but when i vented a downstairs rad (just to see the colour) it was clear. so maybe their is some sludge in this radiator causing...

:lol: good point!!! will try it though i think ... will this prove their is sludge/rust inside the rad causing the hydrogen to build up gradually as a side effect?

ok, thanks again for your advice seco. i appreciate it a lot. i will try tightenting the union nuts a ittle tighter to see if that stops micro air leak drawing air in, and also the glass of water in the vent. if though the probem persists, i will buy an auto air vent. i just hope the...

thanks - i think i have seen them for about £10ish in b and q. will the probem of air getting in to the radiator cause a long term problem? this automatic air vent wil not cure it will it? if you recommend one then i'll buy one tomorrow evening after work and fit it though.

hmm i am slightly worried now!!! as it is only this single radiator, it is puzzing me - i would think if the vent pipe was drawing air in other would too be affected maybe? maybe the radiator valve joint is sightl letting air in as you mentioned.

thanks for yall your help, i will read the info you gave me slowly and google info as it ois really interesting.

ok thanks - one other point i'd like to ask about also: one of my rads (in my bedroom, upstairs) gets coldish at the top and has to be vented of air, probably every 2-3 weeks. why is this? only this rad has the problem... is it normal? when i vent it, like i did again about 1 1/2 hours ago...

hi seco - i have a new cyinder stat new, fixed it up yesterday. ony cost £10.99 from B & Q!! Is a drayton, which is a gd make i believe! It was easy to wire up, just 3 wires C 1 and 2 terminals, the instructions even gave wiring insuctions for when replacing with a different make/model...

haha - i get ya!!!!! ok thanks a lot for tonight and all of your help. you are a legend!! i will ook forward to you telling me tomorrow how it works!!! seems like magic!! thanks again. all the best.

omg it is working!!! the water is getting hot now to the hot water cyinder!!!!!!!!!! how comes? seems like magic!!! i am confused but glad it is working. i am tired too so probably not taking it in properley!! so the cylinder stat needs replacing - and that last test was to make 100%...

so it has proved the cyl stat is not switching (making) when it should be (ie should be caling for heat). it is probably stuck. and that the programmer is ok. do you mean tape the wire at the end on the uninsuated bit? i know it will be live, and i know where the wiring links up, ie i...

wel the reading as instructed, had 243 again. i know it is after 12 now, but what does this mean, i am not 100% sure myself, but am thinking maybe a faulty cyinder thermostat.

ok i see, it proves if the stat or the programmer are faulty. i will check now. bear with me please.

ok i will do it now as i am wanting to sort it.. shall i do the test again on volts with the earth touching the other probe? i am not 100% sure yet how this will prove the programmer is OK, but i trust you so will do it - it would be good though to know what this is proving?? thanks...

yes that is corect - i have just checked again... does it mean a faulty thermostat?

jst done the whole test again - ok, set the meter to ac volts, 600 setting. hot water on at the programmer, and the red light came on at the programmer also. touched earth terminal with one probe and the orange terminal with the other. it gave 0 reading, the grey wire terminal (with earth also...

there was nothing (no reading) in the block which had the orange wire connected to it. so after thinking about it and working it out, i believe the thermostat call switch is not making contact? is this definetely right? i need a new cylinder thermostat? the current one is ACL. (is this in...

ok, am off to do it now (with wires in the blocks). i'll post the resuts when done.

ok than ks. will do it now... just a bit wary of touching with power on as have only tested with power off before. i trust you though ... and it's completely safe right.... one last set of q's (sorry again) any earth in the wiring centre will do right ... and even though other wires...

sorry, i might sound thick as s*** here, but what do you mean, one on probe? sorry :oops: