Gas Water Heater Not Working After a Power Outage
On this page (5 sections)
The Short Answer: A standard gas tank with a standing pilot doesn’t use house electricity, so an outage alone shouldn’t stop it. Power-vent and electronic-ignition tanks need 120-volt power and sometimes don’t restart cleanly when it returns. Check whether your heater has a power cord, restore power once, and follow the label. A pilot that went out at the same time usually blew out from a draft.
Does your gas heater need electricity?
| What you see on the heater | Needs house power? | Common post-outage problem |
|---|---|---|
| Standing pilot, gas control knob, no power cord | No | Pilot blown out by wind or a draft change; the outage was a coincidence |
| Fan or blower on top, plastic vent pipe, power cord | Yes | Tripped GFCI, a control that needs a restart, or a blower that won’t start |
| No pilot, “do not light by hand” label, power cord | Yes | Control in lockout after several failed starts |
| Wall-hung tankless unit | Yes | See Rinnai after a power outage or Navien power outage |
What you can check safely
If the heater has a power cord
- Check that it is plugged in and the outlet has power. Many are on a GFCI outlet that trips during outages. Reset the GFCI or breaker once.
- Turn the heater off and on once using its switch or the control, following the label.
- Listen. The blower should start, then the burner should light. If the blower is silent, don’t keep retrying; see water heater blower not working.
- Read any status-light code against the label.
If it is a standing-pilot tank
- Look through the sight glass for the pilot.
- If the pilot is out, relight it once following the instructions printed on the heater.
- If it won’t light or won’t stay lit, see why won’t my gas water heater stay lit.
For any gas heater: if the gas supply was interrupted too (for example, if the utility shut off the meter), every gas appliance will be out, and the utility may need to restore service and relight pilots. Don’t open gas fittings to bleed air.
When the problem is bigger than a restart
- A surge damaged the control. The display stays dark even with proven power at the outlet.
- The blower won’t start. Bearings that were already worn sometimes fail to start after sitting.
- Repeated lockouts after one clean restart mean the original cause, such as a weak igniter or a dirty flame sensor, is still there.
- Both the furnace and water heater won’t run. They may share a vent or gas supply; see water heater and furnace not working.
What the technician will check
A technician confirms power at the heater, reads stored fault codes if the control keeps them, tests the blower and pressure switch, and checks the igniter and flame sensor. On standing-pilot tanks they check the pilot assembly and thermocouple or thermopile. Surge-damaged controls are replaced as a unit.
Frequently Asked Questions
Q: Can I use my gas water heater during an outage? A: If it is a standing-pilot tank with no power cord, yes, as long as the pilot is lit. Power-vent and electronic-ignition models won’t fire until power returns. Don’t try to run them on an improvised power source unless the manufacturer allows it.
Q: Should I unplug a power-vent water heater during a storm? A: It isn’t required. If you do, turn the heater off first, and when power returns, plug it back in and restart it once following the label.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- PG&E: recognizing and responding to a gas leak (opens in a new tab)Emergency actions for suspected fuel-gas leaks.
Editorial standards and corrections · Prepare a useful service request