Mitsubishi Heavy Industries FDCW100VNX-A, Technical Manual

Page: 199 / 315

Service
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‘19 • HM-T-340
Alarm list
Outdoor unit alarm
Alarm
No. Alarm text on the
display
Description May be due to
E5 Com. flt from the heat
pump
Communication between the control
board and the communication board is
interrupted. There must be 22 Volt direct
current (DC) at the switch CNW2 on the
control board (PCB1).
- Any circuit breakers for FDCW off
- Incorrect cable routing
E35 High HWX temp Temperature deviation on the heat exchanger
sensor (Tho-R1/R2) fi ve times within
60 minutes or for 60 minutes continuously.
- Sensor does not work
(see section "Disturbances in comfort")
- Insuffi cient air circulation or blocked
heat exchanger
- Defective control board in FDCW
- Too much refrigerant
E36 Hot gas alarm Temperature deviation on the hot gas
sensor (Tho-D) twice within 60 minutes
or for 60 minutes continuously.
- Sensor does not work
(see section "Ambient temperature sensor")
- Insuffi cient air circulation or heat exchanger
- Blocked
- If the fault persists during cooling,
there may be an insuffi cient amount of refrigerant.
- Defective control board in FDCW
E37 Sensor fault from heat
pump
Sensor fault, heat exchanger in
FDCW(Tho-R).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
- Defective control board in FDCW
E38 Sensor fault from heat
pump
Sensor fault, outdoor temperature sensor
in FDCW (Tho-A).
- Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
- Defective control board in FDCW
E39 Sensor fault from heat
pump
Sensor fault, hot gas in FDCW (Tho-D). - Open circuit or short circuit on sensor input
- Sensor does not work
(see section "Disturbances in comfort")
- Defective control board in FDCW
E40 High pressure alarm The high pressure switch (63H1) deployed
5 times within 60 minutes.
2HP model: BP4 has been above 4.15MPa
5 times within 60 minutes.
- Insuffi cient air circulation or blocked
heat exchanger
- Open circuit or short circuit on input
for high pressure switch (63H1)
- Defective high pressure switch
- Expansion valve not correctly connected
- Service valve closed
- Defective control board in FDCW
- Low or no fl ow during heating operation
- Defective circulation pump
- Defective fuse, F(4A)
E41 Inv. err. When IPM (Intelligent power module)
displays FO-signal (Fault Output) fi ve
times during a 60-minute period.
Can occur when 15V power source to
the inverter PCB is unstable.
E42 Inv. err. Voltage from the inverter outside the
parameters four times within 30 minutes.
- Incoming power source interference
- Service valve closed
- Insuffi cient amount of refrigerant
- Compressor fault
- Defective circuit board for inverter in FDCW