What makes a useful entry
A code alone tells part of the story. The same ignition code means something different if it appears only when the furnace and dryer are running than if it appears at random. Note what else was using hot water or gas, the time of day, and what you did next.
Keep entries short. A line per event is enough. After a week or two, look for repeats: the same code, the same fixture, the same time of day.
Log
| Date and time | Code or symptom | What was running | What you checked | Result |
|---|---|---|---|---|
Symptoms worth logging even without a code
- Cold burst in the middle of a shower
- Unit will not fire at a particular sink
- Loud bang, whistle or rumble at ignition
- Exhaust smell near the vent or unit
- Water around the base of the unit or at the condensate line
- Display goes blank
Words to use in your notes
- Intermittent
- Comes and goes; note how often.
- Repeatable
- Happens every time under the same conditions, such as two showers at once.
- Cleared
- The code went away after a reset or restart.
- Returned
- The same code came back after clearing.
When to hand it over
- Same code twice.Stop resetting and call a licensed plumber with the log.
- Any venting code or exhaust smell.Turn the unit off and have it inspected before further use.
- Codes after a flush.Check the manual's restart steps; if they persist, share the log and the flush record.
Common questions
Should I photograph the display?
Yes. A photo with a timestamp is a quick, accurate log entry.
Does my unit keep its own code history?
Many units store recent codes that a plumber can read. Your notes add the context the unit cannot record.
What if there is no code but the problem repeats?
Log the symptom anyway; patterns without codes still help diagnosis.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.