Bonaire fault code E01
Water pump fault (evap).
What E01 actually means
Water pump fault on the evaporative cooler. The controller has asked the pump to run and is not getting the response it expects, so the pads will not be wetted and the unit will blow warm.
What causes it
- Water supply to the roof unit turned off, often after plumbing work
- Pump seized after sitting dry all winter, which is the classic one in September
- Pump wiring damaged
- Pump capacitor failed
- Controller output fault
Most likely first. That order is from what we actually find on site, not from the manual.
Safe to check yourself
No tools, no covers off, nothing to do with gas, refrigerant or wiring.
- Check the water isolation tap to the evap is open, usually near the unit or in the roof space
- Check the mains water is on and other taps work
- Turn the system off at the controller for a minute and back on
What we check on site
So you know what you’re paying for.
- Pump current draw and operation on the roof
- Water supply pressure and flow at the unit
- Wiring continuity to the pump
- Controller output test
- Reservoir and float inspection
Can you keep using it?
You can run the fan without the pump, and it will move air, but it will not cool. There is no safety issue. It is just an expensive fan until the pump is sorted.
What the fix usually involves
Most of these are a pump that seized over winter, which is exactly what a pre-summer service prevents. It is a roof job and a stocked part.
Is it worth fixing?
That depends almost entirely on how old the unit is. Past about ten years on hot water and gas heating, and twelve on aircon, a significant repair usually costs more per remaining year than a replacement does — and it’s the same point at which the VEU rebate is worth the most, because old inefficient appliances are exactly what the scheme pays to remove. If yours is young and the fault is a component, we’ll fix it and say so.
Repair or replace? The 10-year rule, and what the rebate is worth →