York YKHC 18, Service Manual

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5.1.3 Evaporator protection against high temperature(heating mode)
Only available to heating mode, including heating mode, heating operation under auto mode.
Note: During protection, the indoor fan continues operating at a setting speed, while the anti-cold air function
of heating and the compressor will be 3 minute delayed to shut down for protection.
5.1.4 Evaporator Protection against low temperature(cooling mode)
5.1.4.1 When the evaporator pipe temperature 3°c and this lasts for 3 minutes, the compressor and outdoor
fan will be shut off.
5.1.4.2 When the evaporator pipe temperature 7°c, it recovers.
5.1.4.3 The restart of the compressor shall execute the delay protection.
5.1.5 Anti-cold air protection
Only available to heating mode, including heating mode, heating operation under auto mode.
5.1.6 Condenser high temperature protection
5.1.6.1Only available to cooling (incl. cooling mode, cooling operation under auto mode) and dehumidifying
mode.
5.1.6.2Delay protection should be performed when the compressor restarts.
5.1.7 Water level protection
5.1.8 Outdoor protection
When outdoor protection signal is high level, outdoor unit will perform protection: the whole machine will
be shut down while the LED will indicate the corresponding protection signal.
The A/C will recover if outdoor errors are eliminated after the outdoor protection occurs.
Only 3HP has outdoor protection function.