1. 2002 Regency Spas, made by National Equipment Mfg. Corp.
2. Dedicated 220 v circuit
3. Type and/or Brand & Model of Control: circuitboard system with no mfr. name anywhere
4. Topside control: Electronic type
5. Pump Configuration: Single Haywood 22v two speed pump.
6. Thermostat: Knob on side of the house and pushbuttons on topside control
7. Heater Type - Vulcan style 2" Stainless Flow Thru, 15" long

The spa heats normally, but quits short of target because the digital thermometer reads 5 degrees warmer than actual water temp. Is there a way to calibrate the digital system to get the reading in sync with the actual water temperature? I can't set for higher than 106, and real temp is only about 100 with it set there.

Please post some photos of this "NEMCO" spa and system.