266 - INSUFFICIENT REFRIGERANT
The alarm is only detected in cooling operation.
1 minute after start-up, BT15 must have decreased by 4K compared to BT3.
Is the service valve fully open?
YES
YES
Is the low pressure normal during
operation?
Open the service valve.
Action.
Are the sensors BT15 and BT3
correctly connected?
NO
NO
Top up refrigerant.
NO
YES
PWB1 -board defective. Replace
the board.
Replace defective sensors.
Are the sensor characteristics for
BT15 and BT3 correct?
NO
YES
267 - INVERTER ERROR
Is there DC 15 V between
the connections CNI3:2-3 on
the control board?
NO
Check the power supply.
Is there DC 15 V when the
fan is disconnected?
YES
YES
Is the incoming voltage
supply ok ?
NO
Replace the control board
(PWB1 )
Can the compressor start?
NO
Replace the compressor.
NO
Is the insulation resistance
and winding resistance of the
compressor OK?
Replace the inverter
board (PWB2 ), if the
fault remains also
replace the filter board
(PWB3 ).
YES
NO
Replace the fan motor.
YES
OK
Try to start several times,
did the compressor start?
NO
Replace the inverter
board (PWB2 ).
Replace the compressor.
Is the voltage supply
from the inverter ok??
YES
NO
YES
YES
OK
NIBE AMS10
Chapter 6 | Troubleshooting
56
