Mitsubishi Heavy Industries FDCW100VNX, Technical Manual

Page: 104 / 173

Service
- 103 -
Alarm list
Alarm with automatic reset
Resets alarm Triggers alarm Alarm text on the
display Alarm
no.
Low condenser out 70
High KF 71
Anti freeze HX 72
Freeze prot 73
Current limit 75
When the low pressure is greater than 8.3 bar or
condenser out is greater than 14 degrees.
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, or lower than 5.0 bar during defrost.
When the outdoor temperature drops below 0°C and
the operating mode does not permit heating.
Temperature limiter alarm
7KHIROORZLQJDODUPEORFNVERWK)'&:91;DQGHOHFWULFKHDWHU
Description
3
Alarm text on the
display Alarm
no. May be due to
TB alarm Temperature limiter in HM270V has tripped.
- The temperature limiter has tripped during
transportation
- High temperature in HM270V
- Blown circuit fuse
- Tripped miniature circuit breaker
Also see the troubleshooting guide on page 108.
HM270V alarm
7KHIROORZLQJDODUPVVWRSWKHRSHU09(OHFWULFKHDWHULVDFWLYDWHGDWPLQSHUPLWWHGVXSSO\WHPSHUDWXUH
Description
4
5
6
7
31
32
Alarm
no. Alarm text on the
display May be due to
OU power failure
Low condenser out
High KF
Anti freeze HX
S. fault HP
Sensor fault KF
No voltage to the outdoor unit from HM270V.
Sensor fault, high pressure (BP4).
Sensor fault, condensor out (BT12).
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 109.
- Low temperature during cooling
- Low flow during cooling
Also see the troubleshooting guide on page 110.
- Low flow in heating operation
- Too high set temperatures
Also see the troubleshooting guide on page 111.
- Open-circuit or short-circuit on sensor input
- Sensor does not work
Also see the troubleshooting guide on page 115.
Also see the troubleshooting guide on page 116.
- Sensor does not work (see “Temperaturesensor”
section)
- Open-circuit or short-circuit on sensor input
- Low flow during defrost
Also see the troubleshooting guide on page 112.
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.
Alarm list