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how can i fix my thermostat?

How do I set the thermostat please? I have a box which is atleast 7 years old and just has plus or minus on the front.
christine mcleod, November 2014
how do i know when the pressure is correct and how do i adjust it .where is the pressure gauge on the grundfos ups 15 50 130?

BM, November 2014
What is the thermostat on? a bit more info would help

toptrish, November 2014