Mitsubishi Electric PUHY-RP200, Service Handbook

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[
IX
Troubleshooting ]
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HWE10130 GB
3. Phenomena
Outdoor unit stops at times during operation.
(1) Cause, check method and remedy
Cause Check method and remedy
The first stop is not considered as an error, as the
unit turns to anti-restart mode for 3 minutes as a pre-
liminary error.
(1) Check the mode operated in the past by displaying
preliminary error history on LED display with SW1.
Error mode (2) Reoperate the unit to find the mode that stops the
unit by displaying preliminary error history on LED
display with SW1.
Refer to the reference page for each error mode.
1) Abnormal high pressure
2) Abnormal discharge air temperature
3) Heatsink thermistor failure *Display the indoor piping temperature table with
SW1 to check whether the freeze proof operation
runs properly, and check the temperature.
4) Thermistor failure
5) Pressure sensor failure
6) Over-current break
7) Refrigerant overcharge
Note1: Frost prevention tripping only under cooling mode
may be considered in addition to the above. (Freeze
protection is detected by one or all indoor units.)
Note2: Even the second stop is not considered as an error
when some specified errors occur. (eg. The third
stop is considered as an error when the thermistor
error occurs.)