Erratic H71 error .

[Slimmbob83]

Hi,

I’ve got a roughly 5 year old nest thermostat which is throwing up an erratic h71 error. Some days it might be fine and won’t need any attention, other days I might need to revisit it to the heat link 3 or 4 times a day. Normally all I need to do is repair it via the thermostat, occasionally I need to reset the heat link.

The heat link is hard wired to the boiler, and approximately 8meters from the thermostat on the same house level as the boiler. It is two rooms away. The heat link is located behind a mini fridge, and I’ve been told it should have 300mm clearance around the heatlink. However, the fridge has been in place for far longer the the fault. 

Before I go and rewire my heatlink, is there a way of testing the signal strength between the heatlink and thermostat? Or, are there any other suggestions?

Cheers. 

[Vladut]

Hi @Slimmbob83 ,

I'm so sorry for any inconvenience caused by this. In this situation I'd recommend to follow the steps below and check if the behavior persists afterwards: 

Turn off the WiFi router.

1. Reset the Heat Link by keeping the button on it pressed for 30 seconds until the LED goes slowly pulsing blue.
2. Take the thermostat off the base and give it a restart, off the base by holding the display and the back of the thermostat pressed for 10-12 seconds. (Hamburger reset) 
3. While the thermostat is restarting, do not put it back on the base yet, but instead, reset the Heat Link again just like before.
4. After the Heat Link is reset, put the thermostat back on the base when it asks you to do so on the screen. 
5. Go to: Replace Heat Link (underneath the H71 error code) and enter the 6 character entry key from the Heat Link, but do not connect just yet.
6. Restart the Heat Link twice (1 restart is a 10 seconds press, until the LED goes off once). 
7. Press connect on the display.

[Slimmbob83]

Hi, 

Thank you very much for all of the above information, I will give it all a try and report back.

[AlexD]

Awesome. Keep us posted on how things go here. 

[AlexD]

Hi, I wanted to check in. Make sure to keep us posted here as soon as possible.