Hitachi Summit RAC-70YH5, Руководство по обслуживанию

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When the connectors of the thermistors are disconnected or the thermistors is open or short, LD301
(red) lights and LD302 (red) blinks so that they indicate troubled parts. Combinations of LD301 and
LD302 are set up for indicating troubled thermistors. The correspondences between the number of
blink time and troubled parts are shown as Table 10-3. Look in the table (LD301 and LD302 blink) for
troubled parts, and if the disconnections of them are checked out, they are replaced.
If you can see two or more troubled thermistors, a small number of blink takes precedence of others.
The electric expansions valve thermistor is put togrther with 3 pieces, when replacing the thermistor,
replace one set of 3 pieces as taking care of positioning. If you don’t do so, the unit may not operate
normally and its cooling performance may drop.
Be ware that only an open-circuit for OH thermistor has to be checked in 5 minutes after the
compressor starts.
If the unit operates abnormally after replacing the thermistor, replace the control P.W.B. because it
malfunctions.
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