Servicing bulletin · Issue 14
Nola Isle services split, cassette, ducted and window units for homes and small premises. Every visit ends with a written condition report — what was cleaned, what was measured, and what to watch before the next one.
What we do
Pick the lane that matches the symptom. If you are not sure, book a diagnosis visit and we will tell you which one the unit actually needs rather than selling the largest package.
01
Routine upkeep for a unit that still cools properly. Filters, blower wheel and evaporator face are cleaned in place, the drain line is flushed, and airflow and drainage are checked before we close the casing.
02
For units with a stubborn smell, a blocked drain, or a coil that no longer responds to surface cleaning. The fan coil is dismounted, the coil and blower are chemically treated and rinsed off-wall, and the drain pan is cleared before reassembly and a wet test.
03
Pressures are read at the service port and compared against the unit's rated range, joints and flares are leak-tested, and insulation is inspected. A unit that loses charge twice in a year has a leak, not a shortage — we locate and quote the repair instead of refilling it again.
04
A single booked visit to find the cause: error codes read at the board, capacitor and contactor tested, sensors and thermistors checked, condenser fan and compressor behaviour observed under load. You get the finding in writing with the repair options ranked by cost.
05
New units mounted, existing units moved between rooms or properties. Includes bracket and gradient setting, pipe run and drainage planning, vacuum before charging, and a commissioning run with temperature readings at the vent.
How often
Runtime and air quality decide the interval. Use the row that matches how the unit is actually used, then adjust if the room is dusty, near a kitchen, or close to a main road.
| How the unit is used | General service | Chemical overhaul | Watch for |
|---|---|---|---|
| Bedroom, nightly | Every 3 months | Every 18–24 months | Musty smell on start-up |
| Living room, daily | Every 3 months | Every 12–18 months | Dust streaks above the vent |
| Shop or studio, all day | Every 2 months | Every 12 months | Drip marks on the wall |
| Kitchen-adjacent unit | Every 2 months | Every 9–12 months | Greasy film on the louvres |
| Guest room, occasional | Every 6 months | Every 24–36 months | Weak flow after long idle spells |
| Outdoor condenser, any unit | Checked at each visit | Coil rinse every 12 months | Leaves packed against the fins |
Between visits, rinse the washable filters every two to three weeks and let them dry fully before refitting. A damp filter is the most common cause of the smell people book an overhaul for.
Field notes
Six symptoms we are called out for most often, with the usual cause and what a technician checks first.
Usual cause — a loaded filter or a blower wheel caked with dust, which slows the air before it reaches the room.
We check — filter condition, blower wheel and evaporator face, then vent temperature against return-air temperature to confirm the split is in range.
Usual cause — a blocked condensate drain or a drain pan that has lost its fall, so water backs up and spills over the lip.
We check — drain line clearance, pan gradient, unit level at the bracket, and whether the insulation on the pipe run has gone hard and started sweating.
Usual cause — dust burning off after a long idle period, which clears in minutes. If it persists, it points at electrical heat.
We check — terminal block and connections for discoloration, capacitor condition, fan motor draw, and the board for scorch marks. Switch the unit off at the isolator if the smell is sharp or acrid rather than dusty.
Usual cause — restricted airflow or low refrigerant charge, both of which drop the coil below freezing and let condensation set as ice.
We check — airflow first, then operating pressures and a leak test across the flares and joints. Topping up a leaking system just moves the problem three months down the line.
Usual cause — short-cycling from an oversized unit for the room, a thermistor reading the wrong temperature, or a condenser that cannot shed heat.
We check — sensor position and resistance, set-point and mode, condenser coil cleanliness, and clearance around the outdoor unit.
Usual cause — a dirty coil making the compressor run longer for the same room temperature, or a set-point that has crept down over the season.
We check — both coils, refrigerant charge, fan speeds, and the temperature split at the vent. A clean system reaching set-point quickly runs for less time, which is where the saving comes from.
On the day
Four steps, the same order every time, so nothing is skipped when the schedule is tight.
We confirm your window the day before and tell you what to clear — roughly a metre of floor space beneath each unit and access to the isolator.
Readings are taken while the unit is still running as you left it: vent temperature, airflow, noise, drainage and error history. That baseline goes in the report.
Sheeting and a catch bag go up before any cleaning starts. Work follows the lane you booked, and anything outside it is quoted before it is carried out — never mid-job.
A full cooling cycle is run to verify drainage and temperature split. We clear the site and send the written condition report with the next recommended interval.
Request a visit
Send the details below and we will reply by email with the lane we would recommend, the time it needs, and the next available windows. No visit is booked until you confirm.
