Is the unit
installation environment
within the range of
limitation?
Is the
refrigerant amount and
piping length
OK?
Is
insertion of
the thermistor connector into
the connector on outddoor
control PCB
OK?
Is
the temperature
thermistors of discharge pipe,
suction pipe, Tho-H and indoor
heat exchanger OK?
Is high pressure
thermistor OK?
Save data for 30 minutes before stopping in Mente PC
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Is the
connected number
of indoor units checked by
Mente PC same as that
mentioned in utility
drawing?
After restarting,
does it recur?
Reset the power and restart
Is the
operation of
indoor EEV OK ?
(at cooling)
Is the operation of outdoor
EEVH OK? (at heating)
Is the operation of
outdoor EEVSC OK?
(at heating and
cooling)
YES
Check and save the data of
operating condition
Check ROM version
Check operation of SV1, SV2
Propose the client to
improve
Adjust refrigerant amount
properly (Check whether
the charged amount is
excess)
If the piping length is less
than 5m, calculate the
correct charging amount
and reduce excessive
refrigerant amount
Connect the signal wires
between indoor and
outdoor units securely.
Insert the connector
securely
Replace the thermistor
after checking whether the
thermistor characteristics is
OK ot not.
Restart operation and check
it, as much as possible,
under the operating
conditions for 30 minutes
before error occurred.
Wait and see
If possible, continue
to collect data (Keep
connecting Mente PC)
Replace EEV coil or EEV
main body.
Check refrigerant amount
again
2. Error detection method
When it detects that the overheat
temperature of discharge pipe
decreased
3
.
Condition of error displayed
If the overheat temperature
of discharge pipe is detected
5degC or lower for 10 minute
continuously.
If the compressor stop is
detected 3 times within 60
minutes
4. Presumable cause
• Faulty discharge pipe
temperature thermistor
• Faulty high pressure
thermistor
• Faulty connection signal wires
between indoor and outdoor
units
• Excessive refrigerant amount
• Faulty indoor EEV
• Faulty indoor heat exchanger
temperature thermistor
• Faulty outdoor EEVH
• Faulty suction pipe
temperature thermistor or
faulty low pressure thermistor
• Falty outdoor EEVSC
• Faulty Tho-H temperature
thermistor
• Piping length is out of
limitation range
Note:
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