Alpha-InnoTec L8 SPLIT - L8 SPLIT;L12 SPLIT Alarm

May be due toDescriptionAlarm text on the dis-
play
Alarm
no.
- Low flow in heating operationToo high temperature out from the condenser.High KF6
- Too high set temperaturesOccurs if alarm 71 occurs 3 times within an hour.
- Low flow during defrostAnti-freeze of heat exchanger.Anti freeze HX7
- Abnormally low temperature in the climate
system
Occurs if alarm 72 occurs 3 times within an hour.
- Low flow during defrostOccurs if the alarm 77 occurs 10 times in succes-
sion.
Defrosting interrupted14
- Abnormally low temperature in the climate
system
- Lack of refrigerant or leak
- Indoor unit and outdoor unit not compatible
with each other.
Indoor unit and outdoor unit do not communic-
ate with each other.
OU not compatible15
- Low flow during defrostOccurs if the alarm 78 occurs 10 times in succes-
sion.
Defrosting interrupted16
- Open-circuit or short-circuit on sensor inputSensor fault, high pressure (BP4).S. fault HP31
- Sensor does not work
- Open-circuit or short-circuit on sensor inputSensor fault, cond out (BT12).Sensor fault KF32
- Sensor does not work (see "Temperature
sensor" section)
- Open-circuit or short-circuit on sensor inputSensor fault, liquid line (BT15).S. fault Liquid line33
- Sensor does not work (see "Temperature
sensor" section)
L8 SPLIT/L12 SPLIT alarm
The following alarms block L8 SPLIT/L12 SPLIT. Addition runs at min permitted supply temperature.
May be due toDescriptionAlarm text on the dis-
play
Alarm
no.
- Any isolator switches for L8 SPLIT/L12 SPLIT
off
Communication between the outdoor unit and
HM 8-12 SPLIT is broken. There must be 22 volt
direct current (DC) at the switch CNW2 on the
control board (PWB1).
OU Com. errorE5
- Incorrect cable routing
- Sensor does not work (see "Temperature
sensor" section)
Temperature deviation on the heat exchanger
sensor (Tho-R1/R2) five times within 60 minutes
or for 60 minutes continuously.
High HX tempE35
- Insufficient air circulation or blocked heat ex-
changer
- Defective control board in L8 SPLIT/L12 SPLIT
- Too much refrigerant
- Sensor does not work (see "Temperature
sensor" section)
Temperature deviation on the hot gas sensor
(Tho-D) twice within 60 minutes or for 60
minutes continuously.
Permanent HotgasE36
- Insufficient air circulation or blocked heat ex-
changer
- If the fault persists during cooling, there may
be an insufficient amount of refrigerant.
- Defective control board in L8 SPLIT/L12 SPLIT
- Open-circuit or short-circuit on sensor inputSensor fault, heat exchanger in L8 SPLIT/L12
SPLIT (Tho-R).
Sensor fault Tho-RE37
- Sensor does not work (see "Temperature
sensor" section)
- Defective control board in L8 SPLIT/L12 SPLIT
SPLIT66
Miscellaneous
Alarm list