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How to Replace an Evaporative Cooler Pump (Step by Step)
Nov
A failed pump is one of the most common cooler faults, and on many coolers it’s a straightforward swap. This guide covers the general steps. Every cooler is slightly different, so follow your cooler’s manual where it differs.
Safety first: coolers are usually on the roof and run on 240V. Use a safe ladder and roof access, and never work on the cooler with the power on. If your pump is hard-wired rather than plugged in, have a licensed electrician or cooler technician fit it.
What you need
- The correct replacement pump – see our pump sizing guide
- Screwdriver and pliers
- Bucket, sponge or wet-vac and a soft brush
- Gloves
Step 1: Isolate power and water
Turn the cooler off at the wall controller, then switch off the isolator on or near the cooler (and the circuit breaker if you can’t find it). Turn off the water supply tap to the cooler.
Step 2: Open the cooler and drain the tray
Remove the pad frame or access panel to reach the tray. Drain the water using the drain valve, or sponge or vacuum it out.
Step 3: Take a photo, then disconnect the old pump
Photograph how the pump, hose and lead are fitted before removing anything. Unplug the pump lead (plug-in pumps only), release the clip or bracket and pull the hose off the outlet.
Step 4: Clean the tray and filter
Scrub out scale and sludge, clean the pump filter or basket and flush the water distribution hose. A clean tray is the best way to make the new pump last.
Step 5: Fit the new pump
Mount the new pump in the same position and orientation, push the hose fully onto the outlet, secure the bracket or clip, and route the lead away from moving parts.
Step 6: Refill and test
Refit the panels, turn the water back on and let the tray fill. Check that the float valve shuts the water off at the correct level. Restore power and run the cooler on cool/pump mode. Within a minute or two the pads should be wet from top to bottom.
If it still isn’t working
- No water in the tray: check the inlet solenoid valve and float valve.
- Pump runs, pads stay dry: check for a kinked or blocked hose or a blocked distributor.
- Pump doesn’t run at all: the fault may be in the control box or wiring – call a technician.
Shop evaporative cooler pumps, or send us your cooler model and we’ll confirm the right pump.
This guide is general information only. Always follow your cooler manufacturer’s instructions, and use a licensed electrician for any electrical work.
