A pilot that will not stay lit can involve the thermocouple or flame sensor, gas control, draft conditions or combustion-air problems. Gas-system diagnosis should be handled by a qualified professional.
What this service covers
- Identify the symptom
- Avoid unsafe DIY work
- Diagnose before replacing
- Request suburban service
What it can mean
A technician should evaluate pilot safety, flame sensing and gas control. Similar symptoms can come from different failures, so replacing a part without testing can waste time and miss the actual cause.
What you can check safely
Note the model, approximate age, fuel type, when the symptom started and whether the problem affects hot water only. Do not bypass a safety control or open gas and energized electrical components.
Repair versus replacement
A sound tank with a contained component failure may be repairable. A leaking tank, advanced corrosion or a high-cost failure on an older unit often shifts the decision toward replacement.