Haier 1U71SABFRA Service Manual page 20

7.1.5 Protection function
7.1.5.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC overheating protection of air-blowing, but air-blowing sensor
malfunction must alarm after 4 minutes during which the compressor is started (during the course of
self-detection, there's no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms, detection
method for each time: continuously sampling for 8 times, then order them and take the mean value of the
middle 2 values), take the mean value.
TTC
115
110
105
98
95
TTC>=115 lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the indoor,
others don't last.
Abnormal stop
Decreasing the frequency rapidly 1HZ/second
Decreasing the frequency slowly (1HZ/10seconds)
The frequency doesn't change.
Increasing the frequency (1HZ/10second)
Increasing the frequency 1HZ/1second
18
Functions and control
Domestic air conditioner