Nibe AMS 10-8 - 9 Alarm List

May be due toDescriptionAlarm text on the displayAlarm
• Low flow during heating operation
• Too high set temperatures
Too high temperature out from the condens-
er. Self-resetting.
High condenser out162
• Temperature generated by another heat
source
Too high temperature into the condenser.
Self-resetting.
High condenser in163
• Set when the heat pump runs the defrost-
ing procedure
Not an alarm, but an operating status.Defrosting in progress183
• Insufficient air circulation or blocked heat
exchanger
• Open circuit or short circuit on input for
high pressure switch (63H1)
• Defective high pressure switch
• Expansion valve not correctly connected
• Service valve closed
• Defective control board in AMS 10
• Low or no flow during heating operation
• Defective circulation pump
• Defective fuse, F(4A)
The high pressure switch (63H1) deployed
5 times within 60 minutes or for 60 minutes
continuously.
HP alarm220
• Open circuit or short circuit on input for
low pressure sensor
• Defective low pressure sensor (LPT)
• Defective control board in AMS 10
• Open circuit or short circuit on input for
suction gas sensor (Tho-S)
• Defective suction gas sensor (Tho-S)
Too low a value on the low pressure sensor
(LPT) 3 times within 60 minutes.
LP alarm221
• Any circuit breakers for AMS 10 off
• Incorrect cable routing
Communication between the control board
and the communication board is interrup-
ted. There must be 22 volt direct current
(DC) at the switch CNW2 on the control
board (PWB1).
OU Com. error223
• The fan cannot rotate freely
• Defective control board in AMS 10
• Defective fan motor
• Control board in AMS 10 dirty
• Fuse (F2) blown
Deviations in the fan speed in AMS 10.Fan alarm224
• Sensor does not work (see section
"Communication connection")
• Insufficient air circulation or blocked heat
exchanger
• If the fault persists during cooling, there
may be an insufficient amount of refriger-
ant.
• Defective control board in AMS 10
Temperature deviation on the hot gas
sensor (Tho-D) twice within 60 minutes or
for 60 minutes continuously.
Continuously high hot gas230
NIBE AMS 10Chapter 9 | Alarm list34
9 Alarm list