Heating working but no hot water

[SparkyFromTheValley]

I changed a 3 way valve over for a mate (im a sparky not a plumber!). For some reason the valve moves to the correct position when the buttons are pressed (i.e. moves to 'h' when heating is pressed, etc) but for some reason the boiler and pump only kick in when heating is selected. apparently he's never been able to get a hot bath but could have hot water for the kitchen sink.

Any help here pls folks?

 

[garrymum]

Maybe better in the plumbing forum?

 

[SparkyFromTheValley]

thinkin batman

 

[Taylortwocities]

Is this a fully pumped system, or gravity?

Some programmers have a link that you have to move to match the system type otherwise DHW only heats when CH is on.

 

[ericmark]

I had the same. On stripping head I found more switches than shown in diagram and one had gone faulty.

Temp cure there is a leaver for bleeding which can be latched in mid position this allowed central heating to continue working while I got replacement head. Domestic hot water overheats in Winter and radiators get warm in summer if left that way but good temp measure while you get new head. Whole valves are easy to pick up but heads often need ordering.

 

[nozspark]

What make of valve are you using??

Personally the plumbers I use all use Honeywell (we all prefer them) and I also try and get them to convert it to a 'S' plan using 2 x 2 port valves. If you do this it gives you maximum flexibility as it does not need to priortise Hot water - you can have H/W, C/H or both at the same time!!

Also Honeywell valves have a manual override lever which will open the valve, but not operate the microswitch...

IMO Sunvic and Drayton valves are rubbish

 

[Taylortwocities]

IMO Sunvic and Drayton valves are rubbish

Here here!

 

[Click-Sure]

Assuming you understand what each of the controls does in your system, and which wires are involved in the process, things should be quite simple, a typical 3 port valve needs the following things:

Earth
Neutral
Central Heating On Feed
Hot Water On Feed
Hot Water Off Feed
Boiler/Pump Live or,
in most modern systems, Boiler Ignite Feed, Pump supply being dealt with by the boiler (the boiler having a permanant live feed).

As to which forum this post belongs to, its not easy, most electrician's wont touch it, neither will most plumbers, I'm not after over-diversification in the DIYnot forums, as things just get too complex, so here is the right place, sort-of.

 

[ColJack]

maybe a make and model of the valve, and even a photo of the connections you've used would help us to solve it for you..

 

[gas4you]

The 3 port valve only supplies power to the system when CH is asked for, after moving the motor fully across, or mid position for CH & HW.

When only HW is called for, the power comes from the cylinder stat and the valve just returns to the HW resting position via the spring return.

Sounds like a classic wiring fault, fault, or maybe the valve body jammed. Did you check the spindle to see if it could turn?

As posted above, check the programmer has HW on & HW off connected.

 

[SparkyFromTheValley]

hey all thanks for your replys, if u could look at post in plumbing area with same topic title there's a bit more information thanks