Cause: the exhaust sensor detects that the exhaust temperature is too
high and triggers the exhaust protection shutdown.
Inspection path: system pressure → indoor / outdoor air inlet →
exhaust sensor → Outdoor Unit panel
1. Check if the system pressure is low, if is, usually it the shortage of
liquid that leads to excessive exhaust temperature protection;
2. Check whether the indoor/outdoor air inlet is blocked, such as
whether the evaporator or condenser is dirty or whether the filter is
dirty or blocked and if inlet is affected, remove the shield.
3. Check whether the air volume at the teh tuyere is too small, observe
whether the Indoor Unit fan blades are dirty blocked, and if dirty
blocked blades are found, clean the blades.
4. Measure the resistance drift of the exhaust sensor with a
multimeter at ambient temperature.
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