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Thanks! I have 3 wires in cy stat! I need to learn how to check the wire in prog & report back!

Ian my bad not following instructions correctly! But am good and meter read as per your initial help! If possible just to enlighten my knowledge on 3 port valve will appreciate your help!as mentioned earlier I have st6400c programmer the switch on the valve stays mid position when hw or ch or...

your stat couldnt be easier to check, demand for HW at programmer, and you should get live voltage at C at stat, with stat turned up demanding heat you should have live at terminal 1 with the stat turned right down no demand for heat , you should get live at terminal two and nothing at terminal...

Hi ian just to say many thanks for all the help! It did take me some time as had to be yoyo as all In loft apart from boiler! My oh will not help as she thinks i will wet/burn the house! But successfully Used the meter with ur instructions and found with no demand 4 heat i donot get live @T2...

Hi i think ian is busy! Any help to close this if cy stat is faulty i can replace Thanking in advance Ih

I hope i have done it right! The valve motor stays on auto side it did not motor across but the boiler kicked In and radiators are getting hot!

Hi again i did as advised fyi the boiler is not responding to cylinder stat i.e. turning off/ on it is staying on Servicing hw demand ! Ian di we conclude faulty cy stat?? Thanks 4 your help

Many thanks again will have a go also kindly confirm if room stat down and i put the cy stat right up should The boiler kick in??? Regards ih

Ian thanks for response but being retired is no excuse but am poor with multi meter can do it only If there is a video! Lol!

Hi my system is potterton profile boiler + hw cylinder with l641A1039 cylinder thermostat and Y plan valve +st6400C programmer past few days i suspected water was very hot decided to check stat ( i turned down room stat) i cannot hear any clicks on turning cy stat right down or right up? Does...

Hi! 1930 built house semi with squeaking stair case currently carpeted ( i know this has to come off to do repairs) 13 steps in total there is meter cupboard underneath and the stairs are boarded with t&g and the toilet next to it toilet is tiled inside so no access to underneath the stairs in...

Hi many thanks Mike &JohnD Yes! Shower pump without any flanges could be the culprit few years ago when plumber replaced the shower pump He said flange was not necessary! Fyi cws tank is 50 gallons and the cylinder is 140 ltr capacity since my initial post I have drained the system added X200 &...

Hi For the past week 20 year old work horse boiler has started kettling noise ( medium pitch) boiler has had bi annual service and x100 topped up over 6 years ago when 3 port valve was replaced 1.Boiler potterton profile 100e 2.F&E tank 3.10 Radiators 4.HW storage cylinder with thermostat...

Hi SUNRAY Many thanks i got it 100% with the diagram just to let you know from connector block in The bulkhead there is only ONE brown going to pir ( as it is twisted hence looks like two browns) hope This info does not change the diagram! Regards

Efl many thanks! Agree dont need a diagram! Your conclusion & me rested got it ! Thanks again kind regards all

Hi ! Nearly there! Being of retired age! Am slow to understand all i have to do is make connexion to white wire! My final request To Efl or Sunray if either of you can draw me final diagram or give me link if there is one kindly note i have T&E cable once Thanks for all the help!

Hi thanks all ! Facing the bulb holder from the left side there are two blue wires one is going to Neutral and the Other is going to pir! From the right side there is white wire which is going to pir! Hope this info helps

Hi sunray! Yes there are 2 browns on the L terminal

TTC thank you! Am ok to follow diagram as provided by sunray before i uploaded photo! As the bulkhead does not Have switched live there needs to be modification! Is it possible for you to draw diagram from the photo if not then I will have to look for sparky or take up the option of stand alone...

Many thanks TTC & SUNRAY ! and yes pir to operate both lights! Attached photo & installation guide Look forwad for final input & thanks again