Power off at MCB, unplug, cover electronics, and move nearby items.

Jet pump, soft/fin brushes, wet/dry vacuum, coil comb, multimeter, screwdriver set.

1. Visual check of filters, coil, drain, fan, and wiring.
2. Remove front grill and filters; pre-vacuum dust.
3. Apply coil cleaner; dwell 5–10 minutes.
4. Jet-wash condenser and evaporator fins.
5. Clean and flush drain pan and drain line.
6. Wash filters thoroughly and set to dry.
7. Inspect fan blade; tighten or align if necessary.
8. Reassemble; wipe excess water; ensure no water on PCB.
9. Power on; run 15–20 min. Check AT difference (supply vs return) — should be 10–15°C.

No vibration, steady condensate flow, no fin damage, supply vs return air temp within 10–15°C.

Power off, cover indoor PCB and connectors, cover walls/floor.

Same as above plus AC cleaning bag/cover and ladder.

1. Fit a protective cleaning bag.
2. Remove filters and panels.
3. Spray cleaner on coil and blower wheel.
4. Jet-wash indoor unit coil and blower wheel.
5. Flush the drain line.
6. Clean the outdoor unit (ODU) coil.
7. Dry and reassemble the unit.
8. Power on and perform a final test.

Silent blower, no splash, proper drain slope, ODU vibration pads intact.

Power off and use dust covers.

Soft brush set, vacuum, blower, fin comb.

1. Remove and wash filters if water available, or blower-dust.
2. Vacuum dust from coils.
3. Soft-brush blower wheel and fan.
4. Clean drain mouth.
5. Inspect and tighten loose contacts/wiring.
6. Apply basic deodorizer spray.

No loose wiring, clean airflow, improved delta T.

Measure window opening, check sill strength, ensure dedicated socket/MCB.

Drill, level, shims, sealant/foam, screws, pliers.

Place and level unit, secure with screws, seal gaps, connect power, and test.

No back-draft, proper tilt, and secure frame.

Site survey, decide IDU/ODU locations, plan piping route and drain slope, check power availability, note pre-charge limit.

Core drill, flaring tool, vacuum pump, manifold gauges, nitrogen cylinder, leak detector, multimeter.

1. Mount the IDU bracket.
2. Prepare copper lines by flaring.
3. Connect and torque the flare nuts.
4. Lay and insulate the drain line.
5. Wire the interconnecting cable.
6. Evacuate lines to min 500 microns.
7. Open service valves, check for leaks, run and commission unit.

Micron hold test, correct torque, no sweating on insulation, tidy routing.

Same as above with heavier bracket/stand, larger pipe sizes (3/8" + 5/8"), stronger power circuit & MCB, and requires two technicians. Always follow OEM charge tables.

Window AC: Remove front & screws, slide unit out, cap & pack, clean opening.

1. Pump-down to store refrigerant in ODU.
2. Disconnect power supply.
3. Disconnect copper lines and cap ends.
4. Remove IDU and ODU mounts.

Refrigerant contained in ODU, ports capped, no oil/dirt ingress.

1. Check dirty filters and coils.
2. Check fan/blower operation.
3. Check supply/return temperature difference.
4. Inspect refrigerant circuit for leaks.
5. Check all electrical connections.
6. Check sensor or PCB errors.
7. Verify thermostat setting.

Identify root cause and quote for repair with parts if needed.

Choked drain line, improper drain slope, iced evaporator coil, or cracked drain pan.

1. Verify unit tilt and drain line slope.
2. Wet-vacuum drain pan; flush drain line with water.
3. Clean evaporator coil and drain pan.
4. If coil is iced, diagnose cause and resolve.
5. If pan is cracked, use sealant.

2L test pour-free flow and no drips.

1. Check indoor blower for dirt/broken blade.
2. Check for loose panels and screws.
3. Check for fan imbalance.
4. Inspect compressor mounts; replace if worn.
5. Re-route any touching copper lines.

Tighten/foam pad/shim, balance blade, replace mounts/bearings, or re-route touching lines.

Wear goggles and gloves. Work in ventilated area. Never mix gases. Scale is mandatory.

1. Connect manifold to service ports and liquid side of cylinder.
2. Slowly open valve; let liquid refrigerant in.
3. Close valve; wait for pressure to stabilize. Repeat until target pressure.

1. Connect manifold to service ports and vapor side of cylinder.
2. Slowly open valve; watch low-side pressure.
3. Verify superheat to ensure proper charge.

1. Nitrogen pressure test for leaks.
2. Triple evacuate system.
3. Charge accurately by weight using digital scale.
4. Final leak check.