Trouble Shooting; The Air-Conditioner Does Not Run After Pressing On/Off Button. - York R-410A Technical & Service Manual

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7 Trouble-shooting

7.1) The air-conditioner does not run after pressing ON/OFF button.

1) Communication malfunction between outdoor units (Only valid for 20,30HP)
Display: The outdoor unit digital diode is displaying "E0"
Solutions: (1) Check if communication cable is broken off
(2) Exchange P, Q line if there is no broken circuit
2) Phase sequence error
Display: The outdoor unit digital diode is displaying "E1"
Solutions: (1) Check if the voltage between the power line terminals A, B, C of outdoor
units and N is normally 220v. If not please check whether the power lines are well connected.
(2) After checking the voltage without finding any error, please transpose any
two of the outdoor units power lines (A, B.C.)
3) Communication trouble between indoor unit and outdoor unit
Display: Outdoor unit digital diode is displaying "E2" and the timer lamp on the display
board of the indoor unit, which has the communication trouble blinks.
Solutions: (1) Check if communication cable is broken off
(2) Exchange P, Q line if there is no broken circuit
4) Outdoor unit temperature sensor abnormal
Display: Outdoor unit digital diode is displaying E3, E4, E5, and E7 (Only valid for 20,30HP)
Solutions: (1) Measure T3, T4, T5, T6 electric resistance respectively and replace the
broken one if the electric resistance is not correct.
(2) If the electric resistance is normal, please test the outdoor PCB and change
a new one if it does not work well.
5) Indoor unit temperature sensor abnormal
Display: The operation lamp of the indoor unit blinks
Solutions: (1) Measure T1, T2, and T3 electric resistance respectively to see if there is an
open or short circuit
(2)If the electric resistance is normal, please test the indoor PCB and change a
new one if it does not work well.
6) Water-level switch abnormal
Display: Outdoor unit digital diode display "E6" and Indoor unit alarm lamp blinks
Method: Check if the water level switch is closed and replace a new switch if the old one
is bad.
7) The address of outdoor unit malfunction (Only valid for 20,30HP)
Display: Outdoor unit digital diode display "E8"
Method: Check the address code of outdoor unit PCB and make sure the address code in
the right position.
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Outdoor