There is an "Over Heated Heater" (OHH or HH) Condition.
One of the Water Temp Sensors has detected 118°F (47.8°C) In the Heater and Spa Functions are Disabled. You Must Press Any Button to Reset when Water is below 108°F (42.2°C). Check for Water Level, Flow Restrictions, Closed Valves, Air Bubbles, and Pump Prime, or Continue for a Detailed Test Procedure.
A Heater Overheat Error Message may indicate Excessively High Heater Temperatures which can Scald or Burn!
If the Heater is Not Cool Enough to Safely Service, allow the Heater to Cool before Continuing Testing.
A Heater Overheat Condition that generates an "OHH" Error Message is Most Likely the result of a Low Flow Condition. Therefore, "OHH" is considered to be a Flow Related Error.
Check for All of the following Conditions:
1. Low Water Level.
2. Blocked Suction Fitting.
3. Blocked Skimmer.
4. Dirty Filter.
5. Too Many Closed Jets.
6. Closed Slice Valve.
7. Heat Related Pump Not Running.
8. Heat Related Pump Not Primed.
9. Contact your Dealer or Service Organization.
For all Diagnostic Messages, click on below link.