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Replenishing or complete filling up of the installation
The installation functions at an optimum water pressure of between 1 and 2 bar. If the step key is pushed briefly, the water pressure can
be shown. After this the waterpressure
is shown. When the step key is pushed again briefly one will return to the or
reading. When the water pressure drops below 1 bar the display will automatically show the text . This text is being
interchanged with the normal display reading . The Brain thermostat will show the text “Waterpressure too low - no disorder - fill water”.
Through out this the boiler will only function at a reduced output. When the water pressure is sufficiently high again (above 1,5 bar) the
text will disappear and the boiler will return to the normal act. If the water pressure drops further and comes below 0,7 bar the display will
show a flashing
text. The Brain thermostat will show the text “Waterpressure too low - disorder - fill water”. After this the boiler is
switched off and will only function again when the waterpressure comes above 1,5 bar.
Turning the boiler off
Holiday period: Adjust the Brain thermostat to the holiday period. See the thermostat manual for this operation. When there is no Brain
thermostat present the room thermostat or the regulation on the night temperature can be adjusted and the hot water
facility can be switched off by means of the program key on the control panel.
Activities: Switch off the three program keys
, , when these are activated. When the boiler is being drained
one should take into account that a part of the heating water will stay in the boiler. When the situation of frost danger
arises one should take care that the remaining central heating water in the boiler will not freeze.
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  • When water don’t heat up. And boiler says A21. What does that mean? Submitted on 22-4-2022 at 17:07

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