Nest thermostat e H153 error

[Keef_t]

Been using the best thermostat e for just over a year. Every so often I get the H153 open therm error. But it's now happening more regularly.

Each time it happened before I checked the wiring and the atag boiler does as have an open therm connection. To correct I need to turn the boiler off and then on.

concerned about the winter months. If we go to visit family and the error occurs then I'm not here to restart the boiler and minimum level of temperature would not then kick in.

Has anyone else experienced this? Extremely frustrating

[Vladut]

Hi @Keef_t, 

Thank you so much for reaching out. Can you tell me since when you've experienced this issue? Was it since the installation?

[Keef_t]

Yes since installation. As I said the vast majority of the time it works. It just seems to randomly show the error. Recently it has happened more often.

[Vladut]

Thanks for the info. Are you an installer by any chance?

[Keef_t]

Yes. I followed the self install instructions provided. 

[Vladut]

In this situation I'd recommend to have a look at the wires to make sure that they are properly fitted at the boiler and Heat Link. As there are 240 V implied I'd definitely recommend an installer to come and have a look.

[Keef_t]

As per the original message I have checked on the wiring. Assume that since it works 98% of the time that if wiring was faulty it works stop it working all the time. Which is not the case 

Could this be a software issue?

[Vladut]

In this situation it might be the communication of the heat link with the boiler. As this behavior happens at random times, one thing to check further would be the opentherm connection from the boiler.

[Vladut]

Hi there, just checking in with you. Did you manage to check my last message?

[Keef_t]

Yes, the connection appear correct and stable

[Vladut]

That's great. Did you try also to turn the power off from the boiler and turn it back on? And same for the Heat Link?

[Keef_t]

Yes. I have done that each time the H153 error had occurred 

[Vladut]

In this situation what I can advise is to have a look at the wires. One of them may be loose or damaged.

[AlexD]

Hi, I wanted to check in. How is it going with your device? 

[Keef_t]

Wires appear in good working order

[TudorL]

Thanks for letting me know. Would it be alright if I send you an email on the address associated with your Community account?

[Keef_t]

yes feel free to contact me

[LarisaL]

Hi there! I just sent you the email. Please let me know once you've completed the form.

[LarisaL]

Hi there, just checking in! Did you complete the form from the email?

[Keef_t]

Hello

 I saw your email. I am currently away from home but return soon. I will then send the details as requested.

K

[AlexD]

Sure thing. Just let us know once you do so me or my colleagues can check for it. 

[Keef_t]

That's the form completed and submitted.

[TudorL]

Hi there, I've managed to send you an email with some further instructions. 

[Vladut]

Hi there, just checking in with you. Did you manage to check the email?

[Keef_t]

I replied it yesterday to email addy

Please screenshot attached of app.

https://photos.app.goo.gl/78K2PMe1AK1fAoJx8 

[LarisaL]

Could you please check them on the actual thermostat, not from the app? 

[Keef_t]

Just checked. Shows as open therm

[LarisaL]

Thank you for checking. Could you tell me if you have a wire in the OT terminal from the Heat Link?

[Vladut]

Hi there, just checking in with you. Did you manage to check the last message?

[TudorL]

Since I haven't heard from you in a while, I'll close this thread, but you can always open a new one, should anything else come up. Have a good one and stay safe!