Rev. F 02-2021
48
MTEC.6500.GB-F-1 Operation and maintenance manual SDA series English
SDA
6ZLPPLQJSRROGHKXPLGL¿HUV
9. DIAGNOSIS AND TROUBLESHOOTING
)DXOWÀQGLQJ
All units are checked and tested at the factory before shipment, however, during operation an anomaly or failure can occur.
BE SURE TO RESET AN ALARM ONLY AFTER YOU HAVE REMOVED THE CAUSE OF THE FAULT; REPEA-
TED RESET MAY RESULT IN IRREVOCABLE DAMAGE TO THE UNIT.
Code
Alarm description
Electronic
sensor
mechanical
thermostat/
hygrostat
Cause
Solution
AhiP
High pressure
Yes
Yes
Too low airfolw or high
room temperature.
&KHFNWKH¿OWHUVLIQHFHV
-
sary replace them. In P
versions, check the pressu-
re drop of the ducts.
AloP
Low pressure
Yes
Yes
Refrigerant charge lea-
kage.
Contact the Company
APBa/ APBi
Room temperature probe
sensor alarm PBa
Yes
No
Replace faulty sensor
Contact the Company
APBu
Room humidity probe sensor
alarmPBu
Yes
No
Atdf
Defrost time too long.
Yes
Yes
Warning
(Reporting only)
Atlo
Low room temperature.
Yes
No
Replace faulty sensor
Contact the Company
Athi
Hight room temperature.
Yes
No
Replace faulty sensor
Contact the Company
Atr
Electrical heater thermal alarm
(if present)
Yes
Yes
7RRORZDLUÀRZ
&KHFNWKH¿OWHUVLIQH
-
cessary replace them. In
ducted versions, check the
pressure drop of the ducts.