Split AC Maintenance Checklist

Split AC Maintenance Checklist for facility and HVAC teams to service AC units, check refrigerant and electrical systems, and record PPM results on site.

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Split AC Maintenance Checklist



Asset Records And Service History

1. Indoor and outdoor unit make, model, and serial numbers


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2. Asset or tag number of the unit being serviced


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3. Refrigerant type and nameplate charge


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4. The previous service visit is logged and the defects raised then have been closed out


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5. Refrigerant handling records for this unit are complete and up to date


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6. Warranty or service agreement conditions on who may service this unit are known


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Safety And Isolation

1. Personal protective equipment required for the task is worn


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2. The unit is switched off and the local isolator is locked off before any panel is removed


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3. A stable ladder or platform is used to reach high-level indoor units


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4. Access to the outdoor unit is safe, including roof access and edge protection where needed


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5. Furnishings and finishes below the indoor unit are covered before cleaning starts


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Indoor Unit

1. Return air filters are removed, washed, dried, and refitted in the correct orientation


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2. Filters are free of tears, distortion, and gaps around the frame


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3. The evaporator coil is clean and free of dust, lint, and biofilm


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4. The blower wheel is clean, with no dust build-up on the blades


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5. The blower turns freely with no bearing noise, rubbing, or imbalance


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6. The indoor unit casing is secure on its mounting and free of cracks or missing clips


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7. Air discharge louvers and the swing mechanism move through their full travel


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8. No musty or sour odor is present when the unit runs


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Condensate And Drainage

1. The drain pan is clean and free of sludge, algae, and standing water


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2. The drain line is flushed clear and water discharges freely at the outlet


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3. The drain line has continuous fall from the unit to the discharge point


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4. The condensate pump runs on demand and cuts out at the correct level, where fitted


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5. The ceiling, wall, and floor around the indoor unit are free of staining and water damage


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6. The drain outlet discharges to an approved point, not onto a walkway or facade


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Outdoor Unit

1. The condenser coil is clean across its full depth, front and back


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2. Condenser fins are straight, with no flattened or corroded areas


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3. Clearance around the unit meets the manufacturer's specification and the airflow path is unobstructed


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4. The fan blade is clean, undamaged, and balanced, with no contact against the guard


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5. The fan guard and all access panels are secure and complete


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6. The unit is level and its mounting feet, brackets, or anti-vibration pads are sound


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7. The casing and base pan are free of rust penetration and the base drains freely


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Electrical And Controls

1. The isolator switch is accessible, correctly labeled, and operates cleanly


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2. Terminal connections at the indoor and outdoor units are tight and free of discoloration


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3. Contactor contacts are clean, with no pitting, welding, or burning


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4. The run capacitor is free of bulging, leaking, and corrosion, and tests within its rated tolerance


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5. The control board is free of burn marks, corrosion, and swollen components


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6. The remote handset or wall controller operates all modes, fan speeds, and set points


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7. Supply voltage at the unit terminals is within the manufacturer's stated range


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Refrigerant Circuit And Pipework

1. Pipework insulation is continuous on both lines, with no gaps, splits, or sun damage


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2. External pipework is protected against weather and mechanical damage


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3. Pipe supports and brackets are secure, with no sagging runs or contact vibration


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4. No oil traces are present at flare joints, valve caps, or brazed connections


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5. A leak test is carried out and the circuit is confirmed leak free


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6. Any refrigerant added or recovered is weighed and recorded against this asset


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Performance Verification

1. Return air temperature and supply air temperature at the indoor unit


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2. Suction and discharge pressures


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3. Running current of the compressor and both fan motors


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4. The temperature differential between return and supply air is within 8 to 11 C (15 to 20 F)


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5. Measured current is within nameplate limits for each motor


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6. Airflow is even across the indoor unit discharge and matches the selected fan speed


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7. The unit starts, runs, and shuts down on demand without short cycling


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8. No abnormal noise or vibration is present at either unit during operation


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9. Relative humidity in the served space is within 40 to 60 percent


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Annual Service Tasks

1. Both coils are chemically cleaned with an approved agent and thoroughly rinsed


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2. Insulation resistance of the compressor and fan motors is tested and recorded


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3. High and low pressure cut-out switches are tested and operate at their set values


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4. Anti-vibration mounts on the compressor and outdoor unit are sound and not perished


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5. Corroded casing, brackets, and supports are treated and recoated


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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