York EAHC-09 FS, Service Manual

Page: 43 / 44

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Locked-rotor protection H6 of PG motor:
Possible reasons:
1. The fan speed is too low due to tuyere blockage;
2. Fan blade get stuck;
3. Motor get stuck;
4. The motor capaci
tor is damaged;
5. Motor damage (foreign odor, open winding circuit or short winding circuit are all abnormal conditions,
and when measuring the winding resistance, note if the temperature of the motor casing is too high causing
thermal protection action);
6. Hall integrated circuit plate is damaged (in normal function, both output and input have voltages).
7. The main board is damaged.
8. Thermal protection of the motor.
Handling methods:
1. Remove barriers.
2. Reassembling;
3. Motor replacement;
4. Capacit
or replacement;
5. Motor replacement;
6. Circuit board replacement;
7. Main board replacement;
8. In normal conditions, the motor does not protect itself. However, in other abnormal conditions,
when motor load is too heavy due to evaporator dirt and fan blade dust, thermal protection occurs frequently
in operation process. The solutions depend on specific reasons, cleaning whatever should be cleaned and replacing
whatever should be replaced.