E1
Sun Joe Pressure Washer
Severity: ModerateWhat Does This Error Mean?
E1 on a Sun Joe means the motor thermal protection tripped from overheating. Switch off, allow 20–30 minutes to cool, and verify the water inlet is unobstructed before restarting.
Affected Models
- Sun Joe SPX3000
- Sun Joe SPX3500
- Sun Joe SPX4001
- Sun Joe SPX4600
- Sun Joe SPX9006-PRO
Common Causes
- Running with trigger released — motor idles and recirculates hot water
- Low or blocked water supply causing pump cavitation
- Continuous use beyond the duty cycle in hot weather
- Restricted nozzle increasing back-pressure on the pump
How to Fix It
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Switch off and unplug.
Unplug completely from the outlet. The thermal cutout will not reset while the machine is energised.
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Allow 20–30 minutes to cool.
Sun Joe's thermal cutout is self-resetting. It requires the motor to drop to a safe temperature before a restart is possible.
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Check the inlet filter.
Locate the inlet on the back of the machine. Remove the garden hose, pull out the filter screen, and rinse it under running water to clear any sediment.
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Avoid prolonged idling.
When you release the trigger, the motor keeps running but water stops flowing — pump heat builds very quickly. Always switch the machine off between tasks.
Frequently Asked Questions
How do I reset E1 on a Sun Joe pressure washer?
E1 resets automatically after cooling — unplug, wait 20–30 minutes, then plug back in and restart. There is no separate reset button.
Sun Joe E1 appears immediately every startup — is it broken?
If E1 appears within seconds of every start, the thermal switch may be stuck or the motor may have heat damage. Contact Sun Joe support — SPX models typically carry a 2-year warranty.