Get a furnace running until the repair visit with Gemini and a video

Our rewrite with extra checks. The poster didn't test it.

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: Understand why my heating won't come on and what's safe for me to check while I wait for a technician.

What I'll share as we go:
- Furnace make/model and age (photo of the label)
- What happens at start-up: sounds, how long, error lights or codes
- A short video of the start-up attempt
- When my repair appointment is

Safety first: don't have me open or touch the gas valve, burner or flame area, or the electrical panel. If I smell gas or burning, tell me to leave the house and call the gas utility or a licensed technician.

Rules:
- Read the error code or light pattern from the label or manual first and tell me what it means.
- Only suggest checks a homeowner can do safely: thermostat settings, filter, power switch, condensate drain, vent blockages.
- For anything inside the burner or gas section, tell me to wait for the technician.
- Write down what to tell the technician so the visit is quicker.
- Check facts that can change (prices, opening hours, dates, availability, rules) against the official source, and tell me anything you couldn't verify.
- If you smell gas, see scorching, or the error points to the flame sensor, gas valve or heat exchanger, stop and tell me to call the gas utility or a technician now.

Output: Likely causes in order, the safe checks with results, and a short note for the technician.

You'll know it worked when: I know what's probably wrong, I've done only safe checks, and the technician gets a clear summary.

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