My nest thermostat seems to have stopped firing my boiler for heating, either in schedule or manual mode.
Having tried a reset on the nest, checking the heat link, running that manually, and turning up the thermostat to a high temperature, nothing seems to make the boiler fire for heating. It does fire for hot water, both in schedule and manual modes.
When increasing the nest heating temperature, it displays as heating, but doesn't fire the boiler at all.
The unit is bang on 2 yrs old.
Solved! Go to Solution.
UPDATE: After some fairly lengthy investigation with a Google support team member, the suggestion was that there may be a faulty relay in the boiler. This requires further assessment by a plumber or professional tradesman. Therefore, it may not be the Nest that's at fault on this occasion.