Nibe S735 - Page 63

• S735 in incorrect operating mode.
– Enter menu 4.1 - "Operating mode". If "Auto" mode is
selected, select a higher value for "Stop heating" in
menu 7.1.10.2 - "Auto mode setting".
– If mode "Manual" is selected, select "Heating". If this is
not enough, select "Additional heat".
• Too low set value on the automatic heating control.
– Adjust via the smart guide or home screen "Heating"
– If the room temperature is only low in cold weather, the
curve slope in menu 1.30.1 - "Curve, heating" may need
to be adjusted upwards.
• Too low or no operating prioritisation of heat.
– Enter menu 7.1.10.1 - "Operating prioritisation" and in-
crease the time for when heating is to be prioritised.
Note that if the time for heating is increased, the time
for hot water production is reduced, which can give a
smaller amount of hot water.
• Hot water demand "Large" selected in combination with
large hot water outlet.
– When you have selected hot water demand "Large",
S735 prioritises hot water production over heat produc-
tion.
If you want to change hot water mode: Enter menu 2.2
and select "Small" or "Medium".
• "Holiday" activated in menu 6 - "Scheduling".
– Enter menu 6 and deactivate.
• External switch for changing room temperature activated.
– Check any external switches.
• The heating medium pump (GP1 has stopped.
• Air in the climate system.
– Vent the climate system.
• Closed valves to the climate system
– Open the valves.
• Incorrect value set in menu 7.1.5.1 - "Int elec add heat".
– Enter menu 7.1.5.1 and increase the value on "Max. set
electrical power".
HIGH ROOM TEMPERATURE
• Too high set value on the automatic heating control.
– Adjust via the smart guide or home screen "Heating"
– If the room temperature is only high in cold weather,
the curve slope in menu 1.30.1 - "Curve, heating" may
need to be adjusted downwards.
• External switch for changing room temperature activated.
– Check any external switches.
LOW SYSTEM PRESSURE
• Not enough water in the climate system.
– Fill the climate system with water and check for leaks
(see chapter "Filling and venting").
LOW OR A LACK OF VENTILATION
• The exhaust air filter (HQ10) is clogged.
– Change the filter.
• The ventilation is not adjusted.
– Order/implement ventilation adjustment.
• Exhaust air device blocked or throttled down too much.
– Check and clean the exhaust air devices.
• Fan speed in reduced mode.
– Enter menu 1.2.1 - "Fan speed" and select "Normal"
• Scheduling activated.
– Enter menu 6 - "Scheduling". Switch off the function or
adjust the settings.
• External switch for changing the fan speed activated.
– Check any external switches.
HIGH OR DISTRACTING VENTILATION
• The exhaust air filter (HQ10) is clogged.
– Change the filter.
• The ventilation is not adjusted.
– Order/implement ventilation adjustment.
• Fan speed in forced mode.
– Enter menu 1.2.1 - "Fan speed" and select "Normal"
• Night cooling activated.
– Enter menu 1.2.2 - "Night cooling". Switch off the func-
tion or adjust the settings.
• Scheduling activated.
– Enter menu 6 - "Scheduling". Switch off the function or
adjust the settings.
• External switch for changing the fan speed activated.
– Check any external switches.
THE COMPRESSOR DOES NOT START
• There is no heating or hot water demand.
– S735 does not call on heating or hot water.
• The heat pump defrosts.
– The compressor starts, when defrosting is complete.
• Compressor blocked due to the temperature conditions.
– Wait until the temperature is within the product’s work-
ing range.
• Minimum time between compressor starts has not been
reached.
– Wait for at least 30 minutes and then check if the com-
pressor has started.
63Chapter 11 | Disturbances in comfortNIBE S735