I have recently replaced my old Honeywell ST699 for a ST799. My problem is
that the CH works when I only use the CH slider. the hot water doesn't work
when I use that slider. also the heating stops working when I use both. any
advice would be most welcome.

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On 19/12/2017 21:14, Stefen diicks wrote:
I have recently replaced my old Honeywell ST699 for a ST799. My problem is
that the CH works when I only use the CH slider. the hot water doesn't work
when I use that slider. also the heating stops working when I use
both. any
advice would be most welcome.

Tell us a bit more about the system? i.e. What type of control valve(s)
does it have?

Have a look at the following "plans" and see if you can identify yours:

http://wiki.diyfaq.org.uk/index.php/...ols_and_Zoning


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Cheers,

John.

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Have you double checked the wiring at the new controller? Wonder whether the hot water wiring has been done incorrectly?

On 19/12/17 21:14, Stefen diicks wrote:
I have recently replaced my old Honeywell ST699 for a ST799.Â* My problem is
that the CH works when I only use the CH slider. the hot water doesn't work
when I use that slider.Â* also the heating stops working when I use
both.Â* any
advice would be most welcome.

You are a diicks and I claim my £50


--
Truth welcomes investigation because truth knows investigation will lead
to converts. It is deception that uses all the other techniques.

On 20/12/17 08:01, wrote:
Have you double checked the wiring at the new controller? Wonder
whether the hot water wiring has been done incorrectly?

Of course it has.

Nothing else could make that happen


--
Truth welcomes investigation because truth knows investigation will lead
to converts. It is deception that uses all the other techniques.