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(25) P7–Anti-freezing Protection in Refrigeration Room
Cause: Protection shutdown due to temperature of indoor coil.
Inspection path: indoor air inlet → indoor unit filter → indoor motor
→ indoor coil sensor
Tools required
for inspection
Multimeter, pressure gauge, regular 20KΩ exhuast sensor (25℃)
Frequent
problematic part
Inspection
procedure and
key points
1. Check whether the indoor air inlet is blocked or not, if it affects the
wind, remove the shield;
2. Check whether the filter is dirty or not. If dirty blockage is found in
the filter, clean the filter.
3. Check if the air volume at teh tuyere is too small and if the indoor
unit fan is blocked, if is, clean the fan.
4. Measure the drift of the inner disk sensor with a multimeter at
ambient temperature.
P7 usually refers to the anti-freezing protection of the refrigeration
room due to poor air inlet.
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