Ductless mini-split quarterly maintenance checklist

Room occupant told and the floor below the head covered

Occupant told before work starts in the room, furniture and electronics under the head moved or covered so drips from the filter pull land on a drop cloth.

Head switched off at its controller before opening

Head stopped at its own controller and the blower fully spun down before the front panel lifts; nothing past the filters and coil face is reached on this round.

Filters at each head cleaned or replaced

Every head's filters pulled, washed or swapped, and reseated, with no head skipped because its room was occupied.

Drain pan and condensate path clear

Pan draining, condensate pump cycling and quiet where fitted, no water staining on the wall or ceiling below the head.

Indoor coil face checked with the filters out

Coil face behind the filters looked at with a light, no dust mat, mold spotting or bent fins; heavy buildup noted so the head is cleaned at the annual.

Condensate pump safety switch tripped where fitted

Water poured into the pump reservoir until the overflow float trips and the head stops cooling or alarms, then resets once the level drops.

Line-set insulation intact

Insulation continuous over the suction line, no gaps, splits or UV damage where the line-set runs outside or crosses the wall penetration.

Wall penetration sealed where the lines pass

Sleeve and sealant around the line set, drain and control cable intact inside and out, no daylight, water tracking or pest entry at the hole.

Line set strapped and protected along the outside run

Straps or line cover holding the run without sag or kinks, lines clear of sharp edges and foot traffic, cover joints and end caps in place.

Outdoor coil and fan clear

Condenser coil free of leaves, grass and lint, fan spinning freely, unit level with clearance around it.

Base pan and ground under the outdoor unit draining clear

Base pan drain holes open, no ice, pooling or standing water under the unit, and defrost meltwater or condensate not running onto a walkway, stair or doorway.

Each head tested in heat and cool

Every head run in both modes from its own controller, supply air noticeably warm then cold, no error codes on the display.

Heads set back to the occupant's mode and setpoint

Front panel latched and each head returned to the mode, setpoint, fan speed and schedule it had before the test, remote left in its holder.

Findings logged by head and room for the annual

Filter condition, coil face, drain and any error code entered against each head and its room, so the annual knows which heads need the deepest cleaning.