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Question for CESTB340 (Added 22/08/16 )

My domestic heating boiler is fitted with 2 X CESTB340 immersion heaters fitted with Thermowatt RTS-3 3412173 (RTS Plus) thermostats. The bottom thermostat has cut out three times in the past two weeks. Can you suggest a cause and can you tell me please where on the thermostat the red pointer should be set to. There is a plus and minus with arrow in between and after the plus there is a single dot and then two dots with no numerical indicator of temperatures.

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