OH2
Tuff Spas
Redundant Overheat Trip
Display shows a secondary overheat code (e.g., OH2 or HOT2); spa shuts down all functions.
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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
Both primary and backup sensors detecting high temperature, Stuck heater relay, Control board logic fault, Poor water circulation in Tuff Spas shell
How to Fix / Troubleshooting
Safety: Do not use the spa until the cause of overheating is identified. Turn off power at the breaker.
- Step 1 – Allow spa to cool: Remove the cover and let water cool to a safe temperature.
- Step 2 – Check for flow issues: Clean filter, verify pumps run, and ensure all jets and valves are open.
- Step 3 – Inspect heater relay: With power off, a technician should test whether the heater is energized when it should be off. A stuck relay requires control board replacement.
Because redundant overheat trips are serious safety events, have a professional inspect the heater and control pack.
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Repair Difficulty
Professional Required
5/5
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