profile has a pump over run, full stat is 80 and due to age could be getting temperamental, good solid boiler that will run forever if looked after properly. Main bp should be around 12mb
Yes, I found the following in the manual
The thermostat knob can be set to O (OFF}, 1, 2, 3, 4, 5 or Max. The graduations 1 to Max. correspond approximately to a temperature range of 55°C to 82°C
which are probably graduations of around 5°C.
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