Evaporative Cooler Maintenance Checklist
Keep evaporative coolers cooling efficiently and hygienically — pad and water-hygiene management, legionella control, pump and bleed-off checks, and fan inspection.
What is an evaporative cooler maintenance checklist?
A evaporative cooler maintenance checklist is a structured list of the 10 preventive maintenance tasks — covering functional, cleaning, safety and record-keeping checks — that keep an evaporative cooler running safely and reliably. It groups routine checks by frequency, from daily inspections to annual servicing, so FM teams and building engineers can plan and evidence preventive maintenance.
Core evaporative cooler checks
- Verify the bleed-off / dump operates to control water concentration
- Inspect and clean or replace the cooling pads
- Check water quality, treatment, and biocide dosing for legionella control
- Record water hygiene, cleaning, and pad condition in the log
What is an evaporative cooler?
An evaporative cooler lowers air temperature by passing it through water-wetted pads, using the energy absorbed as water evaporates — an energy-efficient cooling method in dry climates and for spot cooling. Because it uses recirculating water and generates a moist airstream, it carries a legionella and hygiene risk that must be managed under the site water safety scheme. Maintenance covers the cooling pads, water quality and treatment, the recirculation pump and bleed-off, descaling, and the fan and controls — balancing cooling performance against the hygiene management the wet process demands.
This checklist is one of 34 in our HVAC maintenance checklists, covering air handling units, fan coils, chillers, VRF, ductwork and extract systems — filters, coils, refrigerant and damper checks.
Typical Evaporative Cooler maintenance checklist
A practical starting point for planned preventive maintenance. Always refer to the manufacturer's O&M manual and site-specific requirements.
Functional Checks
- Verify the bleed-off / dump operates to control water concentration
- Check the recirculation pump and water distribution over the pads
- Inspect the fan, motor, and any belts for operation and balance
- Confirm float valve, fill, and drain-down operation
- Verify controls and any seasonal drain-down for winter
Cleaning & Housekeeping
- Inspect and clean or replace the cooling pads
- Clean the water tank/sump and remove scale and sediment
- Descale water surfaces and distribution where scaling is present
Safety Checks
- Check water quality, treatment, and biocide dosing for legionella control
Record Keeping
- Record water hygiene, cleaning, and pad condition in the log
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Typical maintenance frequency
Suggested intervals for evaporative cooler maintenance. Actual frequencies should follow manufacturer guidance and site-specific risk assessments.
Monthly
- •Check water quality and treatment
- •Inspect pads and sump
- •Confirm bleed-off operating
Annually
- •Replace pads as needed
- •Full clean and disinfect
- •Pump and fan service
- •Seasonal drain-down/recommission
Common faults and issues
Issues to be aware of when maintaining evaporative cooler equipment.
Safety and compliance notes
Key safety considerations for evaporative cooler maintenance. This is general guidance only — always follow OEM instructions, statutory requirements, and your organisation's safe systems of work.
Reference standards and frameworks
- United Kingdom
- SFG20, CIBSE Guide M, and the UK F-Gas Regulations for refrigerant plant
- North America
- ASHRAE/ACCA Standard 180, plus EPA Section 608 refrigerant handling rules
Frameworks commonly referenced when planning evaporative cooler maintenance programmes. Always confirm the requirements that apply to your site and jurisdiction.
Managing Evaporative Cooler documentation with PM Assist
PM Assist helps FM and building operations teams search their O&M manuals and building drawings in seconds. Upload your evaporative cooler documentation and ask questions like “What water treatment regime applies to this cooler?” or “When were the pads last replaced?” — and get source-cited answers instantly.
See PM Assist answer questions about a real evaporative cooler manual — try the live demo, no signup needed.
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Chiller maintenance checklist
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CRAC Unit (Computer Room Air Conditioning) maintenance checklist
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Water Treatment Unit maintenance checklist
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Further reading on evaporative cooler maintenance
Compliance topics for evaporative cooler maintenance
Frequently asked questions
Do evaporative coolers carry a legionella risk?
How often should evaporative cooler pads be replaced?
What is bleed-off on an evaporative cooler?
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