I have an OH error in the display of my dreammaker 400x spa.. The pump and heater are rt

Eontact them direct. This is an unknown, undocumented fault but am guessing EE is Electrical Error.

Suite Collection - Owner's Manual PU2 - Dream Maker Spas

https://dreammakerspas.com > uploads > 2019/02
PDF
Always keep an accurate thermometer in the water because your spa's thermostat may be in error. Use a high quality, shatterproof.
Missing: EE ‎' Must include: EE

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  Cabana 2500L Suite - DreamMaker Spas

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  Recline in the deep contours of the Cabana 2500 and experience all the all inclusive suite spa where everything is included.

Change or adjust thermostat.

how old is it maybe motor OH

OH is overheat due to insufficient water flow through the heater.
Common Causes:

• Gate valves not opened/partially closed.
• Air trapped in suction lines or pump
  
• Blocked suction fitting
• Dirty filter
• Restricted water discharge lines
  

Try remove filter cartridge and run spa.
Check pressure switch for continuity.
Unplug & plug hi limit sensor.

Try turning the power off and back on again.

If this doesn't solve the problem you have further issues.

Regards,
Ian.
http://hottub.synthasite.com

"OH" is an overheat error. In normal function, it is used as a safety shut off if the spa water temperature reaches over 110 degrees in the event of a thermostat failure. But more commonly, (if the water temp hasn't gotten too hot) it indicates that the temp sensor(s) have failed. If you have a digital display on the topside controller of your spa, then it is a circuit board controlled spa pack. Most spa builders use the same control pack manufacturer - Balboa Watergroup. The sensor kit usually consists of 2 probes and wires that plug directly onto the circuit board. Depending on the spa, they could both be located onto the heater manifold, or one on the manifold and one mounted to the tub making direct contact with the water via a thru-wall sensor mount. If I knew the spa manufacturer, I could further assist you. If you replace the sensors, and encounter the same problem... then the circuit board is bad, and usually a costly replacement. The sensors are usually listed as a "BA sensor assy" Hope this helps you,

The tub experienced an overheat situation. This may be due to leaving the t stat turned all the way up and not monitoring or the hi-limit sensor is defective. The hi-limit sensor will shut down the heating cicuit if temp gets above 105 D optimally.the fact that the heater light is on is a good sign that things are working at this point.Whether or not a suitable temp(100-103 D) will be arrived at is to be seen. If spa heat kicks off before set temp is reached then replace hi-limit sensor.