Carrier 42/38KCR024713 Service Manual page 20

Service manual
8.4 Protection
8.4.1 3 minutes delay at restart for compressor.
8.4.2 Sensor protection at open circuit and breaking disconnection
8.4.3 Fan Speed is out of control. When Indoor Fan Speed is too high(higher than High Fan+300RPM)or too
low(lower than 400RPM), the unit stops and LED displays failure information and can't returns to normal
operation automatically.
8.4.4 Cross Zero signal error warning. If there is no Cross Zero signals in 4 minutes, the unit stops and LED
displays failure information and can't returns to normal operation automatically.
8.4.5 The current protection of the compressor
If compressor turns off for continuously 4 times due to current protection in 5 minutes from Compressor On,
the unit stops and LCD displays failure information and can't returns to normal operation automatically.
8.5 Fan only mode
Fan speed is high/mid/low/ Auto
8.6 Cooling mode
The 4-way valve is closed at cooling mode.
The action of the compressor and the outdoor fan:(T=indoor temperature)
Compressor on
outdoor fan on
Room temp. down
Room temp. up
Compressor off
outdoor fan off
0 T-Ts
1
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