If your gas water heater fails to ignite and gas stoves supply no natural gas after a perceptible earthquake while the red indicator light on your gas meter blinks continuously, the utility has not imposed a citywide blackout; instead, your home's "microcomputer smart gas meter" detected an earthquake intensity of magnitude 5 (intensity 5) or above, actively triggering its internal electromagnetic safety valve's "automatic emergency shutoff mechanism". Smart gas meters integrate microprocessors, seismic sensors, and ultrasonic flow metering to instantly cut gas supplies during earthquakes, severe line ruptures, or excessive usage durations, averting fires and gas explosions. When a shutoff occurs, as long as you verify zero gas odor indoors, you can personally operate the meter's "black reset button" and wait 3 minutes for automated leak self-testing to restore normal gas flow.
Safety Warning: Before performing a gas meter reset, you must verify by smell that indoors and around the meter are "completely free of any gas odor (added ethanethiol stench)". If you smell gas, strictly refrain from pressing buttons and do not operate light switches or kitchen range hoods; gently open windows for ventilation, shut the pre-meter main gas valve (main breaker), and immediately evacuate outdoors to call the natural gas utility's 24-hour emergency hotline. For gas leak emergency protocols, refer to our guide on Three Emergency Steps for Gas Leaks.
3 Major Safety Shutoff Causes in Smart Gas Meters
Smart gas meters provide 24-hour intelligent monitoring, immediately closing the safety valve and flashing a red light under 3 abnormal operating conditions:
| Shutoff Scenario | Trigger Conditions | Safety Protection Purpose |
|---|---|---|
| Earthquake Shutoff (Intensity 5) | When built-in accelerometers detect seismic intensity reaching 5 (ground acceleration approx 80 gal or above) during active gas flow or severe vibrations | Prevents water heater flue pipes from shaking loose, gas hoses detaching, or toppled stoves causing secondary fires |
| Massive Leak Shutoff | When gas flow surges instantly beyond the meter's maximum rated safety flow (such as detached hoses or rat-bitten rubber tubes) | Cuts gas within seconds before large volumes accumulate indoors, preventing catastrophic vapor explosions |
| Overtime Usage Shutoff | Continuous gas usage at specific flow rates exceeding safety time limits (e.g. high-flame showers over 60 minutes, forgotten low-flame simmer exceeding preset hours) | Prevents pot boil-dry fires from forgotten cooking and carbon monoxide poisoning in enclosed shower spaces |
| Micro-Leak Continuous Shutoff | Continuous gas flow without reaching zero for 24 to 30 consecutive days (indicating hairline fitting leaks) | Provides early warning for rusted concealed piping and wiring or valve seepage before major ruptures develop |
4-Step Visual Guide to Resetting a Smart Gas Meter
Once confirming the premises are completely safe and free of leaks, homeowners can follow 4 standardized steps to restore supply:
- Step 1: Fully close all indoor gas appliances. Ensure all gas stove knobs, water heater power/faucets, and gas clothes dryers are completely set to "OFF"; this is critical, as unclosed valves cause subsequent leak tests to fail.
- Step 2: Unscrew the protective cap over the reset button. Locate the gas meter and find the black round plastic screw cap on the front or lower left of the counter; turn it counterclockwise by hand to remove it, exposing the internal "reset button (black or metallic key)".
- Step 3: Firmly depress the reset button for 3 seconds, then release. Press the reset button firmly inward for approximately 3 seconds; the red indicator light will change from slow blinking to steady illumination or rapid flashing, after which you can release the button and screw the black protective cap back on securely.
- Step 4: Wait motionlessly for 3 minutes for automated leak detection. After releasing the button, high-sensitivity internal pressure sensors execute a 3-minute static pressure decay test on your piping. During these 3 minutes, never ignite stoves or turn on hot water! If internal piping is airtight, the red light extinguishes after 3 minutes and the valve reopens automatically.
