After Running A While The System Stops To Perform Protection. - York R-410A Technical & Service Manual

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7.2) After running a while the system stops to perform protection.

1) Water level alarming trouble
Display: Indoor unit alarm lamp blinks
Solutions: (1) Check if water pump runs well
(2) Check if the drainpipe is broken
(3) Check if the water level switch is blocked
(4) If the above situations do not occur please change a new indoor PCB
2) High-pressure protection
Display: The outdoor unit digital diode is displaying:"P1"
Solutions: (1) Check if the high-pressure protection switch is broken or loosen
(2) Test if the discharge temperature of the compressor is too high. If the
discharge temperature is too high and the current is lower than the rated current, the system is
probably lack of refrigerant and replenishes it.
(3)Test if the pressure (high pressure) is too high or the current is overloaded.
If so the possible causes are: the overcharge of refrigerant, the system air leakage, or bad
ventilation conditions.
a. Let the surplus refrigerant out if refrigerant is too much
b. Let the entire refrigerant out, re-visualize the system and then replenish the
refrigerant if air is penetrating into the system.
c. Improve the ventilation and heat-emission environment for the outdoor unit
3) Low-pressure protection
Display: The outdoor unit digital diode is displaying:"P2"
Solutions: (1) Check if the low pressure protection switch is broken or loosen
(2) Test if the pressure (low pressure) is too low. The probable reasons are:
the overcharge of refrigerant or system blockade.
4) Over current protection
Display: The outdoor unit diode. Is displaying:"P3"
Solutions: (1) Check if the current is overloaded.
(2) The possible reasons for the over current are: the overcharge of
refrigerant, air leakage, and bad ventilation and heat-emission conditions.
5) Compressor discharge temperature protection, Condenser high temperature protection
Display: P4/ P5 is displayed on the outdoor unit diode
Solutions: (1) Test digital discharge temperature, outdoor condenser T3 temperature
(2) Test system pressure
(3)High digital discharge temperature is likely owing to the lack of refrigerant,
air leakage or system blockade. Check the above items respectively to solve the problem.
(4) Condenser high temperature protection owes to the overcharge of
refrigerant, air leakage or bad ventilation and heat-emission conditions.
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Outdoor