{"id":"18492d8e-d354-4750-9c9d-607903ed9627","task":"Diagnose a carbon monoxide callback on a solid-fuel or gas appliance using spillage and worst-case depressurization testing","domain":"bpi.org","steps":["Treat any CO alarm or CO-symptom callback as a combustion-safety emergency: verify occupant safety first (ventilate, confirm no one is symptomatic, involve emergency services if there is an active CO reading in occupied space)","Inspect the appliance, venting/chimney system, and combustion air supply for obvious defects (blocked flue, disconnected vent, cracked heat exchanger, backdrafting) before running diagnostic tests","Perform a spillage test at the draft hood/appliance under normal operating conditions to check whether combustion gases are properly exiting the flue rather than spilling into the room","Perform worst-case depressurization testing by operating exhaust fans, the clothes dryer, and other air-moving equipment simultaneously to see whether depressurization induces backdrafting or spillage that would not appear under normal conditions — following the general combustion-safety testing approach used in building-performance/BPI-aligned protocols","Measure ambient and flue-gas CO levels with a calibrated CO analyzer at multiple points (near appliance, in occupied space) rather than relying on a single spot reading","Do not return a failing appliance to service — document findings, red-tag or advise shutdown of the appliance if unsafe, and refer for repair (venting correction, makeup air, appliance service) before re-testing to confirm resolution"],"gotchas":["A CO problem that only appears under worst-case (all-exhaust-running) conditions will be missed if you only test the appliance in isolation — always run the worst-case depressurization test on any CO callback","This work overlaps with, but is not identical to, chimney sweep scope — combustion safety/CO testing protocols and required equipment (calibrated CO analyzer, manometer) follow building-performance/BPI-aligned practice rather than a chimney-specific standard, so treat exact numeric pass/fail thresholds as something to confirm against current testing protocol documentation rather than assume","Never dismiss a CO callback as a false alarm without instrumented testing — symptoms and detector readings can be intermittent even when a real hazard exists"],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/18492d8e-d354-4750-9c9d-607903ed9627"}