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Gas water heater · Repair Copilot

Water heater status light blinking

That little blinking status light on your gas water heater's control valve is a diagnostic code, not a bad bulb. One flash every few seconds means all is well; two flashes points to a weak thermopile signal; seven flashes usually means the gas control valve itself has failed. Point your camera at the valve and a veteran plumber persona helps you read the water heater status light blinking code and decide what's DIY and what isn't.

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Steps to fix water heater status light blinking

  1. SAFETY FIRST: if you smell gas at any point, leave and call the gas company from outside — do not troubleshoot a gas leak yourself.
  2. Watch the light for a few cycles and count the flashes in each group (they repeat every three seconds or so).
  3. Match the count to the legend printed on the valve or in the owner's manual — the code meaning varies by brand (A.O. Smith, Bradford White, Honeywell, Rheem).
  4. One flash every three seconds is normal 'all good.' Two flashes usually means a weak thermopile signal — clean the pilot/thermopile and confirm a strong pilot flame.
  5. Four flashes often flags a temperature-sensor fault; six or eight flashes can indicate a tank leak or vapor-sensor issue — those are pro calls.
  6. Seven flashes typically means the gas control valve has failed and must be replaced by a licensed plumber or gas tech, not reset.
  7. Do not keep re-lighting or resetting a valve that flashes a hard fault — call a pro rather than forcing a gas appliance that's telling you it's unsafe.

Safety first: if a step calls for gas, a main water or sewer line, a service panel or main breaker, or a sealed refrigerant system, stop and call a licensed pro — Repair Copilot will tell you when you're there.