Smart Home Device

Google Nest Learning Thermostat (3rd gen)

What is likely to break, when it happens, and how expensive it can be — from source-linked reports.

Reliability signal — · Insufficient data · data confidence Very Low

3 failure reports

Reliability summary

What is likely to go wrong, when it happens, and how expensive it can be — from source-linked failure reports.

Reliability signal

—

3 failure reports · Insufficient data · Data confidence: Very Low

Need at least 5 failure-signal reports before showing an A–F grade.

Most common issue: Broken unit; poor warranty escalation
Typical first failure: 10 yr; Median of reports with timing
Median repair cost: —; Reported costs only
Highest reported repair: —; Not a guarantee

What breaks?

Failure types

Click a type in the reports section below to filter.

Broken unit; poor warranty escalation1 · 33.3%
Dead display; told to buy new out of warranty1 · 33.3%
Recurring E105 low-voltage / wiring-changed gear error1 · 33.3%

When does it break?

Failure timing

Months after purchase, using reports that included timing.

What does it cost?

Reported repair costs

Distribution of owner-reported repair costs — not a quote or guarantee.

No reported repair costs yet for this model.

Median months to failure

120

Failure reports

Median repair cost

—

Still recommend

% repaired

% mfr warranty

33.3%

% extended warranty

—

% support helpful

Use these reports as a risk signal, then check current listings before you buy.

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What breaks?

What breaks? · reports

Broken unit; poor warranty escalation

Thermostat hardware

Source-linkedVerify source — Reddit post

Reddit post by u/PixiePooper (r/Nest). UK Nest Gen 3 broke while under warranty; senior-team escalation was slow/unhelpful (including irrelevant OS questions), leaving failure unresolved.

UnverifiedEvidence ★★★☆☆Mfr warranty

View report details

Months until failure

Not stated

Repair cost

Not stated

Repaired

Manufacturer warranty

Yes

Extended warranty

Not stated

Support helpful

Would recommend

AI extraction confidence

90%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Dead display; told to buy new out of warranty

Display / internal battery

Source-linkedVerify source — Reddit post

Reddit post by u/firsthomeFL (r/Nest). Nest Gen 3 display died after odd behavior. Support said likely unsafe battery issue, out of warranty, buy a new unit ASAP (app control still worked).

UnverifiedEvidence ★★★☆☆Not under mfr warranty

View report details

Months until failure

Not stated

Repair cost

Not stated

Repaired

Manufacturer warranty

Extended warranty

Not stated

Support helpful

Would recommend

AI extraction confidence

93%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

Recurring E105 low-voltage / wiring-changed gear error

Thermostat / baseplate power sensing

120 months

Source-linkedVerify source — Reddit post

Reddit post by u/Creative_Name_3269 (r/Nest). Over-10-year-old Nest Learning Thermostat 3rd Gen kept showing a gear error / E105 low-voltage wiring-changed message for days while HVAC still ran. Owner asked whether the Nest itself was failing after HVAC techs found no A/C fault.

UnverifiedEvidence ★★★☆☆Not under mfr warranty

View report details

Months until failure

120 months

Repair cost

Not stated

Repaired

Manufacturer warranty

Extended warranty

Not stated

Support helpful

Not stated

Would recommend

Not stated

AI extraction confidence

86%

Verification status

Unverified

Evidence quality

★★★☆☆ (3/5)

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