Nibe F1255 Installation Manual page 65

– Wait until the hot water has heated up. Temporarily
increased hot water capacity (temporary lux) can be
activated in menu 2.1.
• Too low hot water setting.
– Enter menu 2.2 and select a higher comfort mode.
• Too low or no operating prioritisation of hot water.
– Enter menu 4.9.1 and increase the time for when
hot water is to be prioritised. Note that, if the time
for hot water is increased, the time for heating pro-
duction is reduced, which can give lower/uneven
room temperatures.
LOW ROOM TEMPERATURE
• Closed thermostats in several rooms.
– Set the thermostats to max, in as many rooms as
possible. Adjust the room temperature via menu
1.1, instead of choking the thermostats.
See the "Saving tips" section in the User manual for
more detailed information about how to best set the
thermostats.
• Too low set value on the automatic heating control.
– Enter menu 1.1 "temperature" and adjust the offset
heating curve up. If the room temperature is only
low in cold weather the curve slope in menu 1.9.1
"heating curve" needs adjusting up.
• F1255 in incorrect operating mode.
– Enter menu 4.2. If mode "auto" is selected, select a
higher value on "stop heating" in menu 4.9.2.
– If mode "manual" is selected, select "heating". If this
is not enough, select "addition".
• Too low or no operating prioritisation of heat.
– Enter menu 4.9.1 and increase the time for when
heating is to be prioritised. Note that if the time for
heating is increased the time for hot water produc-
tion is reduced, which can give smaller amounts of
hot water.
• "Holiday mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
• External switch for changing room temperature activ-
ated.
– Check any external switches.
• Air in the climate system.
– Vent the climate system (see
• Closed valves to the climate system.
– Open the valves.
HIGH ROOM TEMPERATURE
• Too high set value on the automatic heating control.
NIBE F1255
• External switch for changing room temperature activ-
UNEVEN ROOM TEMPERATURE.
• Incorrectly set heating curve.
• Too high set value on "dT at DOT"..
• Uneven flow over the radiators.
LOW SYSTEM PRESSURE
• Not enough water in the climate system.
COMPRESSOR DOES NOT START
• There is no heating or cooling demand (accessory is
• Compressor blocked due to the temperature condi-
• Minimum time between compressor starts has not
• Alarm tripped.
• "Additional heat only" is selected.
WHINING NOISE IN THE RADIATORS
page 32).
• Closed thermostats in the rooms and incorrectly set
– 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.
ated.
– Check any external switches.
– Fine-tune the heating curve in menu 1.9.1
– Enter menu 5.1.14 (flow set. climate system) and
reduce the value of "dT at DOT".
– Adjust the flow distribution between the radiators.
– Top up the water in the climate system (see
32).
required for cooling).
– F1255 does not call on heating, cooling or hot water.
tions.
– Wait until the temperature is within the product's
working range.
been reached.
– Wait for at least 30 minutes and then check if the
compressor has started.
– Follow the display instructions.
– Switch to "Auto" or "Manual" in menu 4.1 "Operating
mode".
heating curve.
– Set the thermostats to max. in as many rooms as
possible. Adjust the heating curve via menu 1.1, in-
stead of choking the thermostats.
Chapter 10 | Disturbances in comfort
page
65