Central Heating Y Plan Mistakes: Using a wiring centre is alway best, I show you how

Honeywell Y Plan mid position diverter valve has been with us since the 60's, so why do installers still get it wrong?
One reason is installers use a junction box rather than a Wiring Centre which is so easy to use and recommended for error free installs.
The Honeywell is the best because each wire has one terminal wired clock wise or anti clock wise.
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[@petinyiri]

Hi there, looks like we have similar heating/hot water system Y plan ( i think) as we have a 3 way mid-position motorised valve and also have the same hot water termostat, (both located in our loft space) however we have another 2 way motorised valve just by the hot water cylinder and also a second hot water thermostat on the hot water cylinder, the 2 way valve was starting to make a loud noise (all times), so i replaced it, bought the same as the old, and replaced it, the issue i noticed was with the wiring, in the terminal box we have 3 wirings ( one is the water temperature thermostat, then a wire from the programmer, and the 2 way valve) when i remover the cover i seen the the brown, blue and the earth wire form the programmer and water thermostat connected together, but from the 2 way valve was only the blue and earth connected together with the programmer and hot water thermostat, and the brown from the 2 way valve was connected alone in the terminal box. the orange and gray wasn't connected anywhere, both were blanked, ( my question is that why the brown cable is in the terminal box if not connected together with the browns from the programmer and hot water thermostat.) any advice#?

[@mrcombiBedford]

Dear Peter, I feel sorry for you, a complete mess installed by xx!!! person who has NO knowledge of heating or wiring or YOUR bills and there are load of them that's how I made the 1st. million. Most important is HEATING load, if rads are less the 9 KW = mid position valve 10/16 Kw = 2 zones 16+ Kw = 3 zones, this is basic stuff I taught 40 years ago.
It is strictly forbidden to put a zone valve into a mid poz. system makes it uncontrollable.
If you are classed as competent in wiring then start again but only use the Honeywell wiring centre.
Remove both valves repipe and start again. Follow my advice re air vents + F2. All the best George Staszak 🤩👍

[@ncooper8438]

Even though Honeywell provided a wiring diagram for use with cheapo connection strips, installer still made a wiring mistake with my Y system. Thing is, most of the time the system worked fine, but sometimes it didn't. Wasn't easy to put right.

[@mrcombiBedford]

Agreed, I have loads of wrongly cited systems, made a fortune fixing them. Our Wiring book and APPs are more popular than ever as more installers have a go. Take care, George staszak

[@jockster5525]

Y not thanking you for your efforts 👍

[@mrcombiBedford]

Dear Jock, thanks for the nice reply, take care, george

[@iheggis86]

Great video 👍 what station:day/time is your radio show on?

[@mrcombiBedford]

Hi E, studios are closed to most we have a consumer program when a problem come up either I call in or they contact me to give advice. Thanks for the question, take care george

[@petinyiri]

hi there, I have a ST9400C programming unit, and I am trying to replace my old hcw80 wireless thermostat and receiver, with a newer DT90e in the old receiver have a 5 wiring which are (Blue wired in N, then the brown wired in the L (2nd) then I have a black wire which wired in to A, then a grey wired into B and then the earth wired into the E, , do I follow the same with the new receiver dt90e ? if so where do I connect the earth as on the new dt90e there is no E (mark) only C, in the new receiver dt90e I have a NLL then ABC , any advice? thanks

[@mrcombiBedford]

Hi Peter, only 230vAC R.stats must have earth and 2 lives + neutral,**** DIGI R. stats don't need earth or neutral only some volts or NO volts see boiler info. for [Volt Free connection] in A (Common) out on B * SW.L. to boiler.
Hope that's OK george staszak

[@petinyiri]

@@mrcombiBedford thanks so how do i wire up the new digital one, mean the receiver as it has a NLL, then ABC on the old receiver wired as above i wrote,
N blue, L brown the Black in A and grey in B
thanks, mine issues with the current one is that in the morning the boiler starts and fires up, then it run for a minute or so then goes off, then it wont start again until i scroll down the thermostat to zero and back up to 30 degrees. during the day it works fine, mean heating starts and stop

[@mrcombiBedford]

@@petinyiri
Are you in installer mode?
Reset:- Take the batteries out fit new alkaline, the wiring you know, re-binding as they say Help Line:- Technical Support
Phone: [phone]
Email: [e-mail]
that will work, george