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UK Nest not running boiler for heating

murrayfisher
Community Member

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.

1 ACCEPTED SOLUTION

murrayfisher
Community Member

SOLVED: This issue was caused by a zone valve that had broken. There's one for hot water, and another for heating. As such, it was not a Nest issue, but Google Nest support helped me eliminate that part of the puzzle before finding the real culprit.

View solution in original post

3 REPLIES 3

Simonh12
Community Member

Following as I've just experienced the same this evening. 

murrayfisher
Community Member

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.

murrayfisher
Community Member

SOLVED: This issue was caused by a zone valve that had broken. There's one for hot water, and another for heating. As such, it was not a Nest issue, but Google Nest support helped me eliminate that part of the puzzle before finding the real culprit.

View solution in original post