Er3
AquaRest Spas
Internal Control Pack Error
Display shows Er3 or ERR3; spa may shut down or behave unpredictably.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Corrupted firmware in AquaRest control pack, Internal memory fault, Severe power surge damage, Overheated control board
How to Fix / Troubleshooting
Safety: Disconnect power at the breaker before opening the control pack.
- Step 1 – Power cycle: Turn off the breaker for at least 5 minutes to allow capacitors to discharge, then restore power and observe if Er3 returns.
- Step 2 – Inspect control pack: Remove the control pack cover and look for burn marks, swollen components, or a burnt smell. Ensure ventilation openings are not blocked.
- Step 3 – Check environment: Confirm the equipment bay is dry and not excessively hot. Improve ventilation if needed.
Persistent Er3 usually indicates a failing control pack that should be replaced with an AquaRest-compatible unit by a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Control Pack / Main PCB
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