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146
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Service
'10 • HM-T-149
Alarm list
Alarm with automatic reset
Resets alarmTriggers alarmAlarm text on the
display
Alarm
no.
Low condenser out70
High KF71
Anti freeze HX72
Freeze prot73
Current limit75
Aborted defrost77
Min flow protection78
When the low pressure is greater than 8.3 bar or
condenser out is greater than 14 degrees.
Defrost operation is forcibly finished and heating
operation restarts automatically.
When condenser supply (BT12) is less than 5°C. When condenser supply is greater than 14°C.
When condenser supply is lower than 51°C.
When the outdoor temperature rises above 1°C.
When the current output decreases.Too high current output from the house.
When condenser supply is greater than 60°C and
there are more than 120 seconds since shifting to
the heating system.
When the low pressure is less than 6.5 bar in coo-
ling mode.
When the outdoor temperature drops below 0°C and
the operating mode does not permit heating.
When the low pressure is less than threshold value
according to water temperature.
Defrost operation is forcibly finished and heating
operation restarts automatically.
When the temperature difference between
BT12 and BT3 is bigger than predetermined value
during defrost operation.
Temperature limiter alarm
The following alarm blocks both outdoor unit and electric heater.
Description
3
Alarm text on the
display
Alarm
no.
May be due to
TB alarm Temperature limiter in indoor unit has tripped.
- The temperature limiter has tripped during
transportation
- High temperature in indoor unit
- Blown circuit fuse
- Tripped miniature circuit breaker
Also see the troubleshooting guide on page 151.
Indoor unit alarm
The following alarms stop the operation of indoor unit. Electric heater is activated at min permitted supply temperature.
Description
4
5
6
7
Alarm
no.
Alarm text on the
display
May be due to
OU power failure
Low condenser out
High KF
Anti freeze HX
No voltage to the outdoor unit from indoor unit.
Too low temperature out from the condenser.
Occurs if alarm 70 occurs 3 times within an hour.
- Blown circuit fuse
- Tripped miniature circuit breaker
Also see the troubleshooting guide on page 152.
- Low temperature during cooling
- Low flow during cooling
Also see the troubleshooting guide on page 153.
- Low flow in heating operation
- Too high set temperatures
Also see the troubleshooting guide on page 154.
- Low flow during defrost
Also see the troubleshooting guide on page 155.
Too high temperature out from the condenser.
Occurs if alarm 71 occurs 3 times with in an hour.
Anti-freeze of heat exchanger.
Occurs if alarm 72 occurs 3 times with in an hour.
14 Aborted defrost Occurs if alarm 70 or 77 occurs 10 times continu-
ously during defrost operation.
- Insufficient water flow
- Inproper installation place of outdoor unit
- Refrigerant leakage
Also see the troubleshooting guide on page 158.
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