E09
Bestway Heater Relay / Heating Circuit Failure

Control panel displays E09 and heating cannot be activated

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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

Failed heater relay on PCB, Open-circuit heater element, Burned wiring to heater terminals, Overheated or corroded heater connectors

How to Fix / Troubleshooting

Safety first: Unplug the spa and allow components to cool before inspection. Do not touch live terminals.

  • Confirm symptom: Water does not heat even though the pump runs and the set temperature is above current water temperature.
  • Inspect external wiring: Without opening sealed sections, visually check any accessible heater wiring for discoloration or melting.
  • Power reset: Unplug for 10–15 minutes and retry. If E09 returns immediately, internal components are likely damaged.

Diagnosis of heater resistance and relay function requires a multimeter and access to internal wiring. This should be performed by a qualified technician. In most cases, the heater assembly or entire control unit must be replaced.

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Repair Difficulty

Professional Required 5/5

Required Part

Heater Assembly
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