Nibe F1355 - Page 53

NOTE
Because F1355 can be connected to a large
number of external units, these should also be
checked.
BASIC ACTIONS
Start by checking the following items:
• The switch's (SF1) position.
• Group and main fuses of the building.
• The building's earth circuit breaker.
• Miniature circuit breaker for F1355 (FC1).
• Correctly set load monitor (if installed).
LOW HOT WATER TEMPERATURE OR NO
HOT WATER
• Closed or choked filling valve for the hot water heater.
– Open the valve.
• Mixing valve (if there is one installed) set too low.
– Adjust the mixer valve.
• Large hot water consumption.
– 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.
• F1355 in incorrect operating mode.
– Enter menu 4.2. If mode "auto" is selected, select a
higher value on "stop additional heat" in menu 4.9.2.
– If mode "manual" is selected, select "addition".
• "Holiday mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
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.
• 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.
• 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.
• F1355 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".
• "Holiday mode" activated in menu 4.7.
– Enter menu 4.7 and select "Off".
• External switch for changing the room heating activ-
ated.
– Check any external switches.
• Air in the climate system.
– Vent the climate system.
• Closed valves to the climate system.
– Open the valves.
HIGH ROOM TEMPERATURE
• Too high set value on the automatic heating control.
– 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.
• External switch for changing the room heating activ-
ated.
– Check any external switches.
UNEVEN ROOM TEMPERATURE.
• Incorrectly set heating curve.
– Fine-tune the heating curve in menu 1.9.1
• Too high set value on "dT at DOT"..
– Enter menu 5.1.14 (flow set. climate system) and
reduce the value of "dT at DOT".
• Uneven flow over the radiators.
– Adjust the flow distribution between the radiators.
53Chapter 5 | Disturbances in comfortNIBE F1355