Mitsubishi Heavy Industries FDCW100VNX, Technical Manual

Page: 105 / 173

Service
- 104 -
33
Description Alarm text on the
display Alarm
no. May be due to
S. fault Liquid line Sensor fault, liquid line (BT15). - Open-circuit or short-circuit on sensor input
Also see the troubleshooting guide on page 116.
- Sensor does not work (see “Temperature sensor”
section)
FDCW100VNX alarm
Description Alarm text on the
display Alarm
no. May be due to
E5
E35
E36
E37
E38
E39
OU Com. error
High HX temp
Permanent Hotgas
S. fault Tho-R
S. fault Tho-A
S. fault Tho-D
Communication between the outdoor unit and
HM270V is not made.
Temperature deviation on the hot gas sensor (Tho-
R1/R2) five times within 60 minutes or under 60
minutes.
- Isolator switch for FDCW100VNX off
- Electrical noise from the other equipment.
- Insufficient air circulation or blocked heat exchang-
er
- Blocked filter
- Open-circuit or short-circuit on sensor input
- Defective control PCB in FDCW100VNX
Also see the troubleshooting guide on page 119.
-Defective control PCB in FDCW100VNX
Also see the troubleshooting guide on page 118.
- If the fault persists during cooling, there may be an
insufficient amount of refrigerant.
- Sensor does not work (see “Temperature sensor”
section)
- Sensor does not work (see “Temperature sensor”
section)
- Open-circuit or short-circuit on sensor input
- Defective control PCB in FDCW100VNX
Also see the troubleshooting guide on page 120.
- Sensor does not work (see “Temperature sensor”
section)
- Open-circuit or short-circuit on sensor input
- Defective control PCB in FDCW100VNX
Also see the troubleshooting guide on page 121.
- Sensor does not work (see “Temperature sensor”
section)
- Sensor does not work (see “Temperature sensor”
section)
- Insufficient air circulation or blocked heat exchang-
er
- Defective control PCB in FDCW100VNX
- Too much refrigerant
Also see the troubleshooting guide on page 117.
Temperature deviation on the hot gas sensor (Tho-D)
two times within 60 minutes or under 60 minutes.
Sensor fault, heat exchanger in FDCW100VNX
(Tho-R).
Sensor fault, outdoor air sensor in FDCW100VNX
(Tho-A).
Sensor fault, hot gas in FDCW100VNX (Tho-D).
Alarm list