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High heat setting Set switches 1 and 2 to ON. All three elements will glow and, when the temperature selected on the electronic control dial 3 is reached, two of the elements will automatically turn off, switching back on if the temperature falls. The fire can be returned to low heat setting by pressing switch 2 to OFF. See also ‘Electronic economiser temperature control ’ below. Electronic economiser temperature control This sensitive output control 3 will switch the radiant heater elements ON