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ST Indicates heater is in standard mode. Ec Indicates heater is in economy mode. SL Indicates heater is in sleep mode. 9800 Electronic Control Operation When first powered up, the 9800 electronic system will perform a self-diagnostic check and then it will automatically heat to and maintain a temperature of 100°F (37.5°C) until you change the set temperature as listed in the “Temperature Adjustment” section below. These instructions will describe features and options that your particular spa may