corresponding
3. There is interference in the lines or damage to the indoor and outdoor
PCBs.
1. Check whether the sensor connector is loose, if the plug is loose,
reconnect the plug, otherwise proceed to the next inspection;
2. Pull out the sensor plug and measure the resistance of the sensor to
see if there is a short circuit or open circuit (the sensor is a 5k ohm
temperature sensor). If the sensor is short circuited or open, replace
the sensor, otherwise replace the PCB.
1. Check whether the sensor connector is loose, if the plug is loose,
reconnect the plug, otherwise proceed to the next inspection;
2. Pull out the sensor plug and measure the resistance of the sensor to
see if there is a short circuit or open circuit (the sensor is a 50K ohm
temperature sensor). If the sensor is short circuited or open, replace
the sensor, otherwise replace the PCB.
AC overcurrent
/undercurrent
protection
1. Check whether the input power supply is abnormal, whether it is
lower than 140V or higher than 270V.
1. Observe whether the EEPROM has burnt black, weak solder, or
poor contact;
2. Pull out the EEPROM and re-insert it;
3. Replace EEPROM or replace the PCB.
1. Check whether the high pressure short circuit wire is connected
well with PCB.
1. Check whether the low pressure switch connector is loose, if the plug
is loose, reconnect the plug
2. Check whether the low pressure switch is broken. Measure the
resistance of switch, if the switch is normal, the value is 0.
3. Check whether the outdoor ambient temperature is too low. If yes,
stop the unit.
4. Check whether the stop valve is opened.
5.Check whether the refrigerant is enough.
AC/DC over-
current
protection
1. Check whether the outdoor ambient temperature is too high.
2. Check whether the outdoor unit is bad ventilation or the heat
exchanger is dirty.
3. Check whether the refrigerant pipe is blocked.
1. Restart the outdoor unit first.
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