Nibe F750f750 - Page 75

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Enter menu 1.1 (temperature) and reduce the offset heating curve. If
the room temperature is only high in cold weather the curve slope in
menu 1.9.1 "heating curve" needs adjusting down.
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External switch for changing the room heating activated.
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Check any external switches.
Low system pressure
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Not enough water in the heating system.
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Top up the water in the heating system.
Low or a lack of ventilation
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The ventilation is not adjusted.
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Order ventilation adjustment.
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Filter blocked.
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Clean or replace filter (see page 23).
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Exhaust air device blocked or throttled down too much.
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Check and clean the exhaust air devices (see page 22).
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Fan speed in reduced mode.
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Enter menu 1.2 and select "normal".
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External switch for changing the fan speed activated.
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Check any external switches.
High or distracting ventilation
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The ventilation is not adjusted.
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Order ventilation adjustment.
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Fan speed in forced mode.
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Enter menu 1.2 and select "normal".
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External switch for changing the fan speed activated.
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Check any external switches.
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Filter blocked.
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Clean or replace filter (see page 23).
The compressor does not start
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There is no heating requirement.
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The heat pump does not call on heating nor hot water.
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The heat pump defrosts.
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Temperature conditions tripped.
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Wait until the temperature condition has been reset.
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Minimum time between compressor starts has not been reached.
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Wait 30 minutes and check if the compressor has started.
73NIBE™ F750Chapter 4 | Disturbances in comfort