Nibe F1245 Service Manual

Alarm 51 – low pressure alarm
Is the brine flow correct?
YES
YES
YES
Does the pressure switch
break at the correct pressure?
Is the pressure switch
correctly connected?
Action.
NO
NO
Action.
Is the refrigerant circuit intact?
- Check particle filter
- Check that the brine is bled.
- Check the brine’s freezing
point.
- Check the brine pump.
NO
Action.
NO
Lack of heating medium or
other fault in the cooling
circuit. Check cooling circuit.
YES
NO Action.
YES
Are the brine sensors ( BT10
and BT11 ) showing the
correct temperature?
43Chapter 6 | TroubleshootingF1245

Nibe F1245 Specifications

General

Refrigerant	R410A
Control System	NIBE SMO 40
Dimensions (HxWxD)	1800 x 600 x 620 mm
Energy Efficiency Class Heating 35°C	A++
Energy Efficiency Class Heating 55°C	A++
Heating Capacity	5-12 kW
COP Heating	4.5
Integrated Hot Water Tank	180 liters
Power Input Heating	1.0 - 3.0 kW