topic Re: Nest Link e, strange issue, short cycling and switch off in Nest Thermostats

Nest Link e, strange issue, short cycling and switch off

jammersp67 — Wed, 18 Jan 2023 21:23:22 GMT

Hi all,

The Nest E has been installed and working fine for 2 years now.

I have a worcester 32CDI Combi

The last day or so, the boiler hasn't been firing up on schedule, so i have investigated and this is what happens;

When I click the thermostat up to 19deg's or when it starts the schedule, you hear a click in the link e and the boiler flame icon is displayed on the lcd panel. This stays displayed for a matter of approx 15-20 seconds and goes away. I hear the boiler running and then after a few minutes it shuts down.

I thought I would put the boiler into engineer mode (man with ladder) , this then displays the flame icon and the boiler fires and works, not only for the prescribed diagnostic time, but then continues with schedule (I assume) until it switches off at the end of schedule.

So, in summary, the boiler appears to work and the link E triggers a start (for about 20 seconds) so what could the problem be.

I was wondering, does the link E have to trigger the call to heat for a while and it simply isn't doing it? Or is the boiler part no accepting a call to heat?

Any direction would be good.

Many thanks

James

Re: Nest Link e, strange issue, short cycling and switch off

UanaC — Tue, 24 Jan 2023 16:47:29 GMT

Hello there!

Thanks for reaching out. I am sorry that you're facing an issue with your thermostat. Could you please confirm if the display is working as expected when you turn on the heating? Also, can you please tell me if you have an OpenTherm combi boiler?

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Thu, 26 Jan 2023 17:01:18 GMT

Hi there! Just checking in, did you manage to see our message above?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 08:43:40 GMT

Hi, sorry for the delay in getting back to you. The display is fine and I can here the relay click when the schedule starts. I don't know what an opentherm boiler is, but I have a Worcester 32CDI compact, combi boiler.

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 08:48:16 GMT

Thanks for letting me know! Could you please send me a screenshot with the schedule?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 09:12:25 GMT

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 09:19:28 GMT

Thanks for letting me know! Could you please tell me the ambient temperature when this is happening?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 11:17:36 GMT

For example, the temperature was 12 degrees at about 6pm last night and i heard the relay go in the Nest, I saw the call to heat icon (a radiator) come on, on the boiler and i saw the flame icon illuminate for about 8 seconds and then go out.

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 11:22:29 GMT

Did the display show 19 degrees, like it would be heating? Also, did you hear any second click from the Heat Link( when the heating was about to turn off)?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 12:20:33 GMT

The display did show 19 degrees. I kind of heard a double click when it first started up and heard no click after that time.

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 12:32:41 GMT

Gotcha. Do you have a programmer on the boiler or something that could interfere with the signal from the Heat Link?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 13:31:18 GMT

no, its just a dumb boiler 🙂

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 13:43:02 GMT

If you turn on the heating manually, does the thermostat have the same behavior or is it happening only when the schedule is followed and the heating is triggered by the schedule?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 14:31:34 GMT

So when i go into 'engineers mode' for the central heating - its absolutely fine - the boiler fires up first time, everytime. The problem is only when it is following the schedule or when i 'bump' the heat up.

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 14:48:44 GMT

Could you please let me know if the Auto-Schedule is off or on? If it's on, let's turn it off for the moment. You can do this by going to:

1. In the Nest app:

Open the Nest app and select your Nest thermostat.
Select Settings > Auto-Schedule.
Tap the switch to turn it off.

2. On your thermostat:

Settings > Nest Sense > Auto-Schedule Off.

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 15:40:27 GMT

Hi,

Auto schedule was off, is that the reason why its not firing the boiler as the display says it was on?

Or is Auto schedule something different?

Re: Nest Link e, strange issue, short cycling and switch off

OannaCG — Fri, 27 Jan 2023 15:49:48 GMT

If it was on, it might have interfered with your current schedule. With Auto-Schedule, your Nest thermostat learns what temperatures you like at different times of the day. After a few days of learning, your thermostat will prepare a schedule for you. But in that case, with the Auto-Schedule being off, it's not applicable. Could you please let me know when the heating turns off if the screen is still orange or it changes to black?

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 15:52:16 GMT

At this moment the screen is showing ECO at 9 deg's, ECO is in black and the 9 is in orange, i think the ambinent temp is 15.

Re: Nest Link e, strange issue, short cycling and switch off

jammersp67 — Fri, 27 Jan 2023 15:53:26 GMT

heating is off at the moment

Re: Nest Link e, strange issue, short cycling and switch off

UanaC — Sat, 28 Jan 2023 16:58:06 GMT

Hello there! Thanks for answering. I would like to ask, if you could try to turn off the True Radiant feature, Time to Temperature and also the Sun Block. Please monitor the situation for 24 hours and let me know if the issue still persists.