Maybe contacts of contactor was welded, which lead the heater run continuously, therefor the temperature exceeds the setting value of EGO and the alarm happens.
Please pay attention to confirm whether the surrounding air enter into the system. You can observe the change of dewpoint when the inlet of dehumidifier connects directly to outlet of itself.
Check the return air temp, usually it is lower than 35℃.
Check the pipeline whether there is gas leakage.
Check the dew point sensor and monitor if they are broken.