V–2
Outdoor Nonvolatile Memory (EEPROM) Replacement Sequence
● When replacing the outdoor main board, in the event of nonvolatile memory breakage or F31 error, the work
of replacing the outdoor nonvolatile memory should be conducted in the following sequence.
● A nonvolatile memory is also used in the indoor unit, but be aware that there is no compatibility between the
memories.
1) To ensure reproduction of the nonvolatile memory contents, before removing the nonvolatile memory make
notes of the various judgment values in the parameter setting mode, as well as operation monitor data code
numbers 1 to 4, 6 to 9, and oil change time.
2) Install the nonvolatile memory package in the service board in the outdoor main board.
● Handle the nonvolatile memory with care.
● Because the nonvolatile memory needs to be installed in a certain direction (see diagram below), be
careful to correctly connect it to the designated sockets. Faulty directional installation will cause the
memory to break.
Fit the notched section of the IC socket
into the notched semicircle section of the
nonvolatile memory.
IC socket
Nonvolatile memory
● Because the legs are easily bent, be careful when removing or plugging in the memory.
3) Turn on the power supply.
4) At the initial setting, match outdoor unit capacity (models, etc.) to the outdoor models.
5) For subsequent outdoor unit settings, set the other parameters to the best of your knowledge.
6) Confi rm operation.
7) Always be sure to readjust engine ignition timing.
GHPtroubleshooting.indbV‒2GHPtroubleshooting.indbV‒2 2012/11/2611:20:172012/11/2611:20:17
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