York R-410A, Technical & Service Manual, Page: 295 / 385

Controller
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10. CN5
，
Transformer input
（
TRANS IN
），
220V input.
11. CN4 PWM OUT. Modulate the digital scroll compressor capacity.
12. CN3 Output the control signal to control the four-way valve, digital scroll and fixed-speed
compressor, 220V output
13. CN2 —Outdoor High/Low fan speed. Use 12V DC to drive relay to output 220V AC.
14. CN1 Transformer output
15. CN15 —Outdoor EXV. When powering on for the first time, the EXV will close totally then
open 350p staying in the waiting and open to a fixed degree according to the requirement after
the compressor operated.
Malfunction Code of Outdoor unit
Display Malfunction or Protection
E1 Phase sequence error
E2 Communication malfunction between indoor/outdoor units
E3 T3 temperature sensor malfunction
E4 T4 temperature sensor malfunction
E5 T5 temperature sensor malfunction
E6 Water-level alarm malfunction
P High pressure protection
P Low pressure protection
P Compressor current protection
P Compressor discharge temperature protection
P Condenser high temperature protection