Is my boiler ignoring the controls?

[gianpippero]

Hi all,

just moved into a house and for the first time I have a system boiler instead of a combi: hopefully i'm not missing something obvious!

We have a Vaillant ecoTEC plus 637 System Gas boiler with separate hot water cylinder with a separate Honeywell control panel.

Being summer, on the control panel the heating is off and only the hot water is running on a timer.
However it looks like the boiler is actually heating water and has the heating switched on, even if there is no demand.
In fact the boiler makes noise and feels warm constantly, also outside of when the hot water is meant to be on. Also the Boiler screen has the radiator symbol on.

Am i missing something or is the heating actually ready to go?
(see pictures of the two displays)

 

[Johntheo5]

It could be a CH zone (motorized) valve end switch is faulty and sending a signal to fre the boiler even though the valve is closed.

 

[Scally-Ho]

There is something obviously amiss because the boiler is showing heating at a flow temp of 62, but is in between firing as shown by the hourglass symbol. Until someone can actually diagnose the fault, you could lower the heating flow temp to its lowest setting from the control buttons just below the boiler display screen.

 

[Madrab]

Depending on how it is wired, if it’s a standard S plan 240v switching, then The boiler will show the rad symbol regardless of whether its heating the cylinder or the rads, as that is just showing there’s a call for heat at the boiler to create hot water for the whole system.
Where that hot water goes is controller by the programmer, stats and zone valves.
Your programmer is calling for HW so that’s why the boiler will be running. The programmer sends power to the HW cylinder stat, then on to the zone valve, the zone valve opens and that then send power to the boiler and pump for it to run.