Find out a broken AC is just a bad thermostat with Grok and Gemini

Posted

Jun 25, 2025 by @AZinCLE

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Last checked

Oct 17, 2026

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Method:

How we verify

Evidence: Described by posterThe person describes what happened in words, without screenshots or video.

Outcome

When their AC stopped working and none of half a dozen companies could come before Friday, a poster asked Grok and Gemini. The poster says they correctly diagnosed a broken thermostat, probably saving hundreds of dollars and 2 days without AC.

Agent

Grok, Gemini

The source didn't share its exact prompt, so we wrote this from what it describes.

Let's work this out together. I'll tell you what I know, you suggest options and ask what you need, and we'll narrow it down step by step. Nothing gets booked, bought or sent until I say so.

Goal: Before a technician can come, figure out whether my AC problem is something simple like the thermostat.

What I'll share as we go:
- Thermostat model and whether the screen works
- What happens when I change the setting
- Breaker and filter status
- Photos of the thermostat and its wiring

Safety first: if this involves gas, the electrical panel or mains wiring, structural work, or anything that smells of burning or gas, stop and tell me to call a licensed professional.

Rules:
- Check thermostat power, batteries, settings and wiring first.
- Explain a simple test to bypass or confirm the thermostat if it's safe.
- If it's the thermostat, help me pick a compatible replacement.
- Tell me when it's time to wait for the pro.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.

Output: Likely cause, how we confirmed it, and the part to buy if needed.

You'll know it worked when: the AC runs again, or I know it's not the thermostat.

Let's work this out together. I'll tell you what I know, you suggest options and ask what you need, and we'll narrow it down step by step. Nothing gets booked, bought or sent until I say so.

Goal: Before a technician can come, figure out whether my AC problem is something simple like the thermostat.

What I'll share as we go:
- Thermostat model and whether the screen works
- What happens when I change the setting
- Breaker and filter status
- Photos of the thermostat and its wiring

Safety first: if this involves gas, the electrical panel or mains wiring, structural work, or anything that smells of burning or gas, stop and tell me to call a licensed professional.

Rules:
- Check thermostat power, batteries, settings and wiring first.
- Explain a simple test to bypass or confirm the thermostat if it's safe.
- If it's the thermostat, help me pick a compatible replacement.
- Tell me when it's time to wait for the pro.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.
- Check the replacement thermostat is compatible with my system's wiring before I buy it.

Output: Likely cause, how we confirmed it, and the part to buy if needed.

You'll know it worked when: the AC runs again, or I know it's not the thermostat.

Before you finish: re-read my goal and constraints, check your answer against each one, and list anything you assumed or couldn't confirm.

Source

https://x.com/AZinCLE/status/1937946028340109341