Inspect a Furnace Cabinet, Blower Area, and Basic Service Points

A. Finished-Project Specification

Quantity: one de-energized, inspected, cleaned-where-authorized, and correctly reassembled furnace or air-handler cabinet, with a completed Furnace Cabinet Inspection Worksheet recording cabinet condition, wiring observations, cleanliness, service labels, and any items referred to a licensed HVAC technician.

B. Cabinet Inspection Schedule

Item	Target Condition	Verification Method
Equipment de-energization	Verified absent voltage at authorized test points before panel removal	Non-contact voltage tester reading and written record
Access panels	Only manufacturer-identified inspection panels removed, in the required sequence	Visual confirmation against equipment manual
Blower compartment	Motor, wheel housing, control area, and filter path identified from a safe distance	Visual confirmation and photograph
Visible wiring	Inspected for discoloration, loose insulation, abrasion, or unsupported leads without contact	Visual confirmation and written record
Cabinet cleanliness	Dust, debris, rust, staining, pests, and foreign objects identified	Visual confirmation and written record
Service labels	Model, serial, electrical, and filter labels identified and photographed	Photograph and written record
Panel reassembly	All panels reinstalled with tabs, screws, gaskets, and interlocks fully engaged	Visual and physical confirmation
Restart	Normal startup observed from outside the closed cabinet with no fault indications	Visual and auditory observation

C. Material Takeoff

• Documentation materials: one Furnace Cabinet Inspection Worksheet, camera or phone camera for labels and conditions.
• Consumables: vacuum bag or canister capacity sufficient for the loose debris expected in the cabinet, based on the Project 01 system map notes on visible dust or debris.
• Hardware: no replacement hardware is authorized by this project; all original panel screws, clips, and door-switch components must be reused.

D. Acceptance Standards

Check	Standard
De-energization	Verified absent voltage at authorized test points before any panel is removed
Panel scope	Only manufacturer-identified inspection panels removed; no restricted component removed or disassembled
Wiring observation	Every visible wiring condition recorded without touching terminals or connections
Cleanliness	Only manufacturer-approved cabinet areas vacuumed; no wiring, controls, or rotating components contacted
Labels	Model, serial, electrical, and filter labels identified and photographed or recorded as unresolved if illegible
Reassembly	All panels reinstalled in the required sequence with tabs, screws, gaskets, and interlocks fully engaged
Restart	Normal startup observed with no fault codes, abnormal noise, panel vibration, or odor
Documentation	Furnace Cabinet Inspection Worksheet complete with all findings and any items referred to a licensed technician

E. Preparation and Manual Review

1. Review the equipment manual, access-panel sequence, service labels, and authorized inspection areas. Record which panels the manual identifies as removable for routine inspection before touching the equipment.
2. Shut down and de-energize the equipment using Chapter 2. Confirm the HVAC Readiness Checklist for this equipment is complete before proceeding.
3. Allow hot components to cool. Wait the manufacturer-specified or a minimum 15-minute cooldown period before opening the cabinet.

F. Exterior and Access-Area Inspection

1. Inspect the exterior cabinet, platform, clearances, flue or vent exterior, condensate, filter access, and surrounding area. Record clearances, platform condition, and any visible exterior damage on the worksheet.
2. Stop work for gas odor, scorching, melted wiring, damaged venting, water in electrical areas, severe corrosion, or suspected heat-exchanger issues. If any of these conditions is present, do not proceed to panel removal; record the condition and escalate.

G. Panel Removal

1. Remove only the access panels identified for routine owner or service inspection. Follow the exact removal sequence stated in the equipment manual.
2. Support panels and preserve screws, clips, and door-switch components. Place removed fasteners in a labeled container to prevent loss.
3. Do not bypass a door interlock. If the interlock removes power when the panel is opened, treat the equipment as de-energized for the remainder of the inspection but do not rely on the interlock in place of the Project 02 verification already performed.

H. Blower Compartment and Wiring Inspection

1. Identify the blower compartment, motor, wheel housing, control area, filter path, and visible service labels from a safe distance. Record the location of each on the worksheet.
2. Inspect visible wiring for discoloration, loose insulation, abrasion, or unsupported leads without touching terminals. Record any wiring condition observed, including its approximate location.
3. Inspect accessible cabinet surfaces for dust, debris, rust, water staining, pests, and foreign objects. Record each condition found and its approximate location.
4. Inspect the blower wheel visually for heavy buildup, damage, or rubbing without disassembling it. Record the observed condition; do not attempt to correct buildup or damage found here.
5. Do not remove the blower assembly, motor, control board, burner cover, heat-exchanger panel, or refrigerant components. If further evaluation of one of these components appears necessary, record it as a referral item.

I. Label Identification and Cleaning

1. Identify model, serial, electrical, filter, and service labels. Photograph each legible label; record illegible or missing labels as unresolved.
2. Vacuum only loose debris from manufacturer-approved cabinet areas using nonconductive attachments where specified. Do not vacuum inside the blower housing, control area, or any restricted component.
3. Keep tools and vacuum attachments away from wiring, controls, and rotating components. Maintain clearance from the blower wheel, motor, and control board at all times.
4. Verify that condensate tubes, wiring, insulation, and panels remain in their original positions. Confirm nothing was displaced during the inspection or cleaning.

J. Reassembly and Restart

1. Reinstall all access panels in the required sequence. Follow the reverse of the manufacturer's removal sequence identified in Step 4.
2. Confirm that panel tabs, screws, gaskets, and interlocks are fully engaged. Check each panel by hand for looseness or gaps before proceeding.
3. Restore power and observe normal startup from outside the closed cabinet. Do not open the cabinet during this observation.
4. Stop for fault codes, abnormal noise, panel vibration, odor, or failed operation. If any of these occur, re-isolate power before investigating further and escalate if the cause is not within this project's authorized scope.
5. Document cabinet condition and items requiring licensed service. Complete every field on the Furnace Cabinet Inspection Worksheet before closing out the project.