Hot Water Issue (Nest, Unvented)

[Andy Byford]

Hi all,

I was wondering if any of you heating / plumbing gurus had any advice for me in regards to my current issue.

A few months ago, my hot water cylinder stopped calling for heat from the boiler and has been running on its immersion heater ever since. The heating works fine with no issues and the boiler kicks in when the thermostat is turned up.

On Friday I finally caved and paid a plumber to come have a look, who came back on Monday to replace one of the silver motorised valves where the cylinder is. On Friday he manually left it open so that central heating would warm up the hot water tank whilst it was on.

Since replacing the valve part on Monday, the boiler is still not activating for the hot water (The tank was cold yesterday so had to switch the immersion heater back on, which heats the water up just fine but costs a bomb).

He mentioned that if this valve replacement doesn't solve the issue, then it is the nest that is causing a problem. In the nest app hot water is always set to on, but is also always greyed out and never orange as if its actually heating.

Is there any way to test the nest is actually asking the boiler for heat? The immersion is costing me a fortune and I can't really afford another plumber callout just to take a look.

Thank you in advance for your advice.

 

[RandomGrinch]

In the nest app hot water is always set to on, but is also always greyed out and never orange as if its actually heating.

This seems to be a known issue and could be unrelated.

Nest app hot water screen grey when on

Hi anyone else experiencing in the app when hit water is on the screen status grey. However when turn on manually via heatlink it is orange and says manual. Tried reset but when I boost water it starts but status grey. Very annoying

www.googlenestcommunity.com

Is there any way to test the nest is actually asking the boiler for heat?

If you have some confidence with electrics, with the power off, you can connect together the wires in terminals 5 and 6 of the Nest. Then disconnect any wires in terminal 4 (safely terminate in a separate, spare terminal block).
If the hot water comes on after you reinstate power, the Heatlink is likely to be at fault.
If you are unsure of the connections to be made, post a pic of your Heatlink wiring.

 

[Andy Byford]

Thank you for the reply, I will do as you recommended to test it.