y plan

I hope that thread title makes sense. Here's a bit more info. We got a call a few days ago that there was no HW but CH was ok. 3 port got changed, Now HW and CH both working. I got a call today to go back, no CH, I walk in and it's hot, turn room stat up and heating comes on fine and they...

I had a standard Y plan system which has now been added to to provide UFH to an extension. The additions are a T off the hot feed into a 2 port valve into a 22mm thermostatic valve and then into a grundfos pump. This then pumps round the UFH with the return flowing into the 22mm thermostatic...

i have got to change over a w plan system. If it was just changing to a Y plan, is it just a case of ptting in the new mid position valve and running a hot water off? Or, would you recommend changing it to an S plan?

Morning Fitted a Vaillant 637 on a Y Plan, It has santon premier plus unvented tank and a new Honeywell ST95 a two channel programmer. Everything seems to work correctly as in when the demand for hot water or heating is requested the boiler fires. But as soon as if you turn it off from the...

Just after some advice, All my installs on unvented has always been S Plans. A mate is installing unvented, original system is on a Y plan, can the unvented be on this? I know S plans are preferred because if 1 zone fails the likely hood of the other going aswell is slim. Cheers guys, views...

Valve motors over, but doesn't switch boiler on. 240v on white wire, 65v on grey (dhw off) and 35v on orange (ch switched live). So not enough to switch the boiler on. Dhw is fine, but get 80v on grey wire. Clock is a Honeywell st9400c, about 18 months old. I know these clocks have been...

called to a job today no htg or hw. find fuse in board blown and 13amp fuse in spur.trace to pump fault - replace pump with a rated all merchants now stock at £110 . all good but notice with programmer off the boiler and pump on running through bypass. remove htg on wire from junction box and...

Got called to a customer today where the H/W was getting too hot and that the mechanical timer was losing time, replaced the timer, easy enough. But checking the operation of the mid-position valve, when you have heating only demand, the valve will only move to mid-position. Checking voltages...

You know those jobs you wish you never got involved in. I'm in one:(. An old friend had a whole new set of controls and a 3 port installed. All Honeywell parts. His gloworm boiler has only ever reached 52 degrees and won't get any hotter. I'm called in. So I get to the bottom of the boiler issue...

Gents, please help with this odd one... Old prog and my fitted new one: HW brings boiler on. CH does not. If HW on and CH advanced, 3pv will move over to middle, all good. If HW then off at prog, boiler stays on until CH off (cant remember if 3pv goes to CH or stays in Middle) Dual channel...

This sticky is a reference only thread and will be populated by posts referring to Y plan wiring only.

Afternoon all, As title suggests, customer has an intermittent fault with their heating, sometimes it does not come on but both times I have been out to look, it is working! My initial thought was 3 port valve but looks as if it has been replaced (paint stripped either side of nuts!) I am...

Y plan fault I don't know much about y plan wiring.. fault is call for hot water and heating works till tank is to temp then shuts down,call for heating and nothing no pump or anything, opened up the wiring centre and there is a blue and orange not connected from the diverter just white gray and...

I don't know much about y plan wiring.. fault is call for hot water and heating works till tank is to temp then shuts down,call for heating and nothing no pump or anything, opened up the wiring centre and there is a blue and orange not connected from the diverter just white gray and earth cable...

Hi I've had a HWC moved from one room to the next and some pipework changed but it looks like I've lost! my thumb vents / bleed values. It's an open vented system with a heat only boiler and indirect cylinder. Basically the boiler pumps hot water upstairs to the bedroom, there is a vertical...

Alpha 24R boiler with Alpha digital 7 day 2 channel programmer, Honeywell Y plan with standard Honeywell junction box. Wiring checked and as recommended. I have been having trouble for some time and the results of tests were not consistent. The room and cylinder thermostats were checked and...

customer complaint they got central heating but got no hot water on a Y plan system. my 1st thought was diverter valve. when around to have a look, here's what happen- turn thermostat up and then turn central heating on- boiler fires up and diverter valve moves to heating side. while the...

the boiler has a wiring diagram which shows Mains via fused spur feeding L & N in the boiler and then Ns Ls Lr to the wiring centre - why does this boiler need to Lives (L and LS) and two neutrals (N and Ns) the wiring centre has L N in from a spur, L connected to Ls N connected to Ns, Lr for...

Hi, I'm new here and I would be grateful for some advice if you can spare the time. I have a Y plan heating system which did not have a problem before a recent boiler replacement but now is constantly filling with air. In the loft there are two header tanks one for the hot water and the other...

Hello one and all, I have often looked at this place for hints and tips but am really struggling now. We recently had a new boiler and radiators fitted to our y-plan open vent system. The new boiler is an Ideal logic plus heat 30. Our system has a sunvic time clock, Honeywell stats and a 3 port...