When a Melbourne evaporative cooler stops working or stops cooling effectively, the fault is almost always in one of five areas: the pump, the pads, the fan motor, the water supply system, or the wall controller. This guide works through each fault systematically — with clear indicators for each fault type and guidance on what you can address yourself and what requires a qualified technician.
System Runs But Blows Warm Air
If your evaporative cooler is running — fan on, air coming out — but the air is not noticeably cooler than outside, work through these checks in order:
1. Check the controller is in cooling mode (pump on)
Most Melbourne evaporative coolers have a fan-only mode where the pump does not run — this circulates air without evaporative cooling. Check the controller is set to cooling mode, not just fan. On Brivis controllers the pump is typically a separate button labelled “Water” or shown by a water droplet icon. On older Seeley/Breezair units, the selector dial must be set past “Fan” to the cooling position.
2. Listen at the roof unit for water
If the controller is in cooling mode but the air is still warm, stand outside and listen at the roof unit. You should hear the sound of running water trickling through the pads. If you hear only the fan, the pump is likely not running — this is a pump fault (see the pump fault section below).
3. Check pad condition
Heavily mineralised or degraded pads reduce evaporation to near zero even when the water is running. If the system has not been serviced for two or more seasons, pad failure is a likely cause. Signs: white crusty scale visible on pads, reduced airflow through vents, minimal cooling even on dry days. The fix is pad replacement — see our full pad replacement guide for Melbourne costs and DIY guidance.
Fan Won’t Start
If the wall controller appears to respond but the fan at the roof unit does not start, check in this order:
Circuit breaker
Go to the main switchboard and check for a tripped breaker labelled “Evap”, “Evaporative”, or “Cooling”. Reset it once and test. If it trips again immediately, do not reset a second time — this indicates a wiring fault or motor short circuit requiring a technician.
Motor capacitor
The motor starting capacitor is the single most common cause of fan motor failure in Melbourne evaporative coolers. When it fails, the motor hums but does not turn, or does not start at all. Capacitor replacement is $320 to $480 as a complete job. It is not a safe DIY task — capacitors store a charge that must be safely discharged before handling.
Motor bearing seizure
Older motors with worn bearings may seize, particularly after sitting dormant through Melbourne’s winter. Signs: the motor is hot to touch, hums but will not turn, or smells of burnt insulation. Motor replacement is required — budget $500 to $750 as a complete job depending on the model.
Pump Not Running — Dry Pads
If the fan runs but no water circulates (dry pads, warm air), the pump has failed or is not receiving water supply.
Check the water supply
The sump may be empty because the water supply has been turned off (sometimes left off after the previous season’s winterising), or because the float valve is stuck closed. Locate the water supply tap near the roof unit and confirm it is open. If the tap is open but the sump is empty, the float valve may be stuck — on accessible units this can be freed by manually depressing the float arm.
Pump capacitor or motor
The pump motor also has a capacitor that can fail, producing the same symptom — fan runs, no water. Pump capacitor or full pump replacement is $320 to $550 as a complete job. If the pump is more than eight years old and the motor has failed, replacing the entire pump assembly is typically more cost-effective than repairing the motor.
Water Leaking From the Unit
Water leaks from an evaporative cooler have three main sources: sump overflow from a failed float valve allowing overfill (the overflow typically flows onto the roof surface and may enter the ceiling via roof penetrations); a cracked or corroded sump (older steel-sump units, common in Melbourne homes with 15+-year-old Brivis installations); or water entering the duct from a tilted unit or degraded duct seal.
Any water entry into the ceiling space is a serious issue. Turn the unit off and isolate the water supply immediately, then call a technician. In Melbourne brick homes, even a small roof penetration water leak can cause ceiling staining and mould growth within days during summer.
Unusual Noises From the Roof
- Belt slap or squeal: worn or loose fan belt on older belt-drive Brivis and Seeley models. Belt replacement is $280 to $420 as a complete job. Ignore it and the belt will break.
- Grinding or rumbling: fan motor bearing wear. Replace before the bearing seizes.
- Rattling or vibrating: loose cabinet panels, debris in the fan housing, or loose roof mounting bolts.
- Splashing or uneven water sounds: blocked distributors causing uneven pad wetting — clear the drippers.
Wall Controller Not Responding
A blank or unresponsive wall controller is usually caused by: a blown fuse on the controller circuit; loss of power to the controller cable from the roof unit; or a failed controller unit. Brivis and Breezair replacement controllers are available and are a straightforward swap — typically $350 to $600 as a complete job including the controller unit and installation labour.
If the controller display shows an error code, note the full code and refer to our Brivis service guide or Seeley/Breezair service guide for the specific fault meaning.