01
Single fixture
Keep one outlet or drain isolated when every nearby comparison remains normal.
Sheet 18 / Diagnostic set
Draw the smallest boundary the evidence supports
Decide whether the evidence is limited to one fixture, one branch, one level, or more of the property.
One fixture, several fixtures in one room, one floor, and the whole property are different symptom extents. Start narrow and expand only when a comparison produces another observation.
Call about the symptom877-702-1610
INPUTOBSERVETRACEVERIFYOUTPUTRECORD
S-01Symptom named
S-02Access mapped
S-03Provider unverified
S-04Scope pending
Identify the symptom
Five callouts for this drawing
Each note describes an action, not a diagnosis. Leave unsupported branches open.
02
Room cluster
List shared timing across a sink, toilet, tub, shower, or appliance.
03
Level pattern
Compare one safe representative fixture above and below the affected floor.
04
Property pattern
Use whole-building language only after multiple distant points show the change.
05
Unknown branch
Leave untested and inaccessible lines visibly unresolved.
Trace the source
Follow evidence through the branch
Make a fixture list with hot, cold, drain, sound, moisture, and timing columns. The provider can use that grid to decide which branch or system needs direct inspection.
Repair route and access map
Define the boundary before authorization
Save the tested fixtures, measurements, access points, finding, and untouched branches. The closeout should show what was ruled in, ruled out, and never examined.