Gecko · in.xe / in.ye / in.yt and MSPA / SSPA packsStop using the tub

HL on a Gecko hot tub: high limit tripped

The water temperature at the heater reached about 119°F and the system shut down. Do not enter the water. Let it cool, then reset power.

Also shown as: H L, high limit

Most likely causes

  1. 1Low flow through the heater from a dirty filtermost likely
  2. 2Air lock or low water levelcommon
  3. 3Failed hi-limit probeless common
  4. 4Stuck heater relayless common

What to try, in order

  1. Stay out of the water and remove the cover to let the tub cool.
  2. Check the water level.
  3. Turn off power at the breaker and clean the filter.
  4. Once cool, restore power to reset the system and confirm strong flow at the jets.
  5. If HL returns, switch the tub off at the breaker and call for service.

HL questions

How do I reset HL on a Gecko pack?

Let the water cool, then turn the breaker off and on. If the cause is not fixed, HL will come back.

Is HL the same as OH?

No. HL is measured at the heater and trips around 119°F. OH is the spa water itself reaching about 108°F.

Related codes

Gecko AOH · Equipment bay too hotGecko FLC · Flow switch stuck closedGecko FLO · No water flow detectedGecko 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.