Mitsubishi Heavy Industries ESA30E-25, Technical Manual

Page: 170 / 239

- -
'15 • HM-T-246
. Applicable model
. Troubleshooting
All models
Diagnosis Countermeasure
Is the
outdoor fan of heat pump
water heater rotating?
NO
YES
YES
Save the Mente PC data of 30 minutes
before stopping
Reset the power source and restart operation
After power OFF
After
restarting operation, does the
same error reappear?
NO
YES
Is DC15V
of power source voltage detected
at the C19 terminal of
inverter PCB?
NO
Is the
connection of power
transistor sensor connector OK?
(Check short circuit and
disconnection of
wiring harness)
Is the
power transistor
mounted properly?
(Check tightning of screws and
application of silicon
for radiation)
NO
NO
NO
YES
YES
Is the
characteristics of power
transitor temperature sensor
OK?*
* See characteristic of sensor
on Page 83 for details.
YES
YES
Is the
inverter cooling fan
rotating?
NO
• Check the operation status and
record it.
• Check the power transistor temperature
• Check the operation of outdoor
fan of heat pump water heater
and the operation of inverter
cooling fan
Rectify it according to the
troubleshooting procedure of E
Restart operation under the
operating conditions 0 minutes
before error occurred as possible
as you can.
Wait and see
(If possible, collect the operation
data continuously)
If it does not run despite its
operation range, check the voltage
at connector.
If 0/0V is detected, replace
fan motor.
If 0V is detected, replace control
P CB.
After checking loose connection
of connector or disconnection of
wiring harness. replace inverter
P CB
Connect the connector of sensor
securely.
Or replace the sensor.
Replace the power transistor
sensor.
Apply the silicon for radiation to
the power transistor and mount
the power transistor on to the
Replace the power transistor.
. E rror detection method
When anomalously high
temperature is detected
. Condition of error displayed
E rror signal from power
transistor is detected times
within 0minutes. (E )
Or error signal from power
transistor is detected for
minutes continuously (E )
. P resumable cause
• P ower transistor anomaly
• P ower transistor temperature
sensor anomaly
• Anomalous power source to
inverter P CB
N ote:
Inverter cooling fan is operated under the condition mentioned at right.
If the same error does not reappear, continue to get data with Mente P C.
Error code
Remote control:
7-segment display:
LED Green Red
Heat pump
water heater
Keep
flashing
1-time
flash
Content
E (E )
E (E ) -
P ower transistor overheat
ON
OFF
81°C
Power transistor sensor temperature
85°C
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