Hey guys, had a look at a walk in freezer. The system is on R404a. Evaporator iced up due to defective thermostat, the liquid line drier was also blocked as I had a low suction pressure. Replaced the drier and thermostat, defrosted the evaporator but its still icing up. Checked the heaters and they draw 3.2 amps each, any ideas what would cause this.
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