Self-Diagnosis - Carrier 42/38KCJ024713 Technical & Service Manual

At the beginning of energizing or after the stop of the compressor, 3-minute delay will be
needed to start the compressor.
When switching over between cooling/heating mode, the compressor stops
automatically.
8.1.2 Evaporator protection against high temperature
8.1.2.1 Only available under heating mode.
8.1.2.2 The operation principle is as follows: (T2 = evaporator temperature)
Condition
T2>56° C
T2>62° C
T2<62° C
T2<50° C
Note: During protection, the indoor fan continues operating at a set speed, while the
anti-cold air function of heating and the compressor will be 3 minute delayed to shut
down for protection.
8.1.3 Evaporator Protection against low temperature
8.1.3.1 Only available under cooling and dehumidifying status.
8.1.3.2 Protection principle:
Condition
T2<2° C（last 3 minute）
T2>8° C
8.1.3.3 The restart of the compressor shall execute the delay protection.
8.1.4 Condenser high temperature protection
8.1.4.1 Only available to cooling and dehumidifying mode.
8.1.4.2 Action condition
Condition
Condenser temp.>62° C
Condenser temp.<48° C
8.1.4.3 Delay protection should be performed when the compressor restarts.
8.1.5 Outdoor protection
When outdoor protection signal is high level, outdoor unit will perform protection: the
whole machine will be shut down while the indoor unit will indicate the corresponding
protection signal.
The A/C will recover if outdoor errors are eliminated after the outdoor protection occurs.

8.2 Self-diagnosis

Codes Contents
P4 Protection of temperature of indoor evaporator
P5 Protection of temperature of outdoor condenser
Outdoor fan
Off
Off
On
On
Outdoor fan
Off
On
Outdoor fan
Off
On
23
Exploded view & spare-part
Compressor
On
Off
Off
On
Compressor
Off
On
Compressor
Off
On