Replacing faulty hot water valve - Manual overide safe in the interim?

[MAJ786]

Detached 4 Bed house.

10 year old Worcester Greenstar 40 CDI boiler. When this was plumbed in the system was changed - The CH top-up tank was removed, an expansion tank added, together with a pressure gauge outlet and top-up tap.

I guess that means the open/vented system was converted to a closed/un-vented one.

The heating system is on two circuits - upstairs and downstairs with their own thermostats.

The hot water tank was updated to a well insulated one, and fitted with a thermostat for boiler, and an electric Immersion heater.

There is also a more recently added underfloor heating system for the kitchen/diner.

Hot water has stopped working. There seems to be a manual override on each of the two valves (one for radiator heating, and one for hot water?).

I assume there is one/more pumps tucked away somewhere in the pipe boxing (pictured).

Until the repair can be carried out by a professional is it safe for me to over-ride the vale manually, so I can stop using the less effective immersion heater?

Thanks V much

 

[mogget]

You can open the valve manually and set the boiler flow temperature to 60-65 degrees. This won't bring the hot water on though, so you'd have to call for heat from the heating.

If you're using the heating this is probably worth doing, otherwise it's probably better to keep using the immersion.