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AOH on a Gecko hot tub: equipment bay too hot

The temperature inside the spa cabinet is too high, which has pushed the control pack above its normal limit. The water is fine, but the equipment needs to cool.

Also shown as: A OH, ambient overheat

Most likely causes

  1. 1Hot weather and direct sun on the cabinetmost likely
  2. 2Pumps running for a long time with poor cabinet ventilationcommon
  3. 3Blocked cabinet ventscommon

What to try, in order

  1. Remove the equipment bay access panel to let hot air out.
  2. Wait for the code to clear by itself as the pack cools.
  3. Clear leaves, mulch, or stored items away from the cabinet vents.
  4. Shorten pump run times and filter cycles during heat waves.
  5. If AOH appears in cool weather, have the pack checked.

AOH questions

Is AOH dangerous?

Not to bathers. It protects the electronics. The water temperature is a separate reading.

Can I leave the cabinet door off in summer?

Leaving it off for a few hours to cool the bay is fine. Put it back to keep out rain, pests, and children.

Related codes

Gecko FLC · Flow switch stuck closedGecko FLO · No water flow detectedGecko HL · High limit trippedGecko Hr · Internal hardware errorGecko OH · Spa water overheatGecko Prr · Temperature probe problemGecko UPL · No configuration software

General guidance. Follow your manufacturer's instructions; anything inside the control box is work for a licensed professional. Updated October 5, 2026.