Water heaters often misbehave only some of the time: a pilot that goes out on windy nights, a relief valve that drips after the heater has run for a while, a tankless unit that cuts out only when two showers run. By the time a plumber arrives, the heater may be working fine. Notes made at the time are the best evidence you have.
Keep the log near the heater or on your phone. Short entries are enough, as long as each one has a date and the conditions.
Log template
| Date and time | What happened | What was running | What you did | Result |
|---|---|---|---|---|
Details worth capturing
- Whether hot water was cold, lukewarm, ran out early or swung between hot and cold
- Sounds: popping, rumbling, hissing, whistling or clicking
- Any water on the floor, at a fitting or at the relief valve pipe
- Error codes on a tankless display, written exactly
- Pilot or burner flame color and whether it went out
- Which fixtures and appliances were running at the time
- Weather or anything unusual, such as wind, a power blip or recent plumbing work
When the log says stop logging and call
- IfAny entry mentions a gas smellLeave the home and call 911 or SoCalGas from outside, then a plumber.
- IfWater from the base of the tank appears more than onceShut off the cold supply and energy and arrange an assessment.
- IfThe relief valve releases hot water or steamShut the heater down and call a licensed plumber.
- IfThe same error code or outage repeatsBook a diagnosis and bring the log.
Questions to ask with your log in hand
- Does the pattern in my log point to a particular part?
- Is there anything else I should be recording?
- Is this something that will get worse if I wait?
Common questions
How long should I keep a log before calling?
Don't wait on anything involving gas smell, leaks from the tank or relief valve discharge. For minor intermittent issues, even a few entries help.
Is a phone note good enough?
Yes. What matters is a date, the conditions and what you observed. Photos make it better.
Should I give the log to the plumber?
Share it at the start of the visit. It can save diagnostic time and steer the inspection.
General information for Orange, not a quote or professional advice. In an emergency, call 911.