Dehumidifier shows P1 and stops; water tank is empty or partially filled.

Note: On many Trotec models, P1 is not a fault but an indication that the unit is in defrost mode.

Steps:

• Wait for defrost: Leave the unit powered on. P1 should clear automatically after several minutes when the coil warms up.
• Check room temperature: Ensure the room is within the operating range specified in the manual (typically above 5–7°C). In very cold rooms, move the unit to a warmer area.
• Clean filter and coil: Dirty filters and coils can cause excessive icing. Clean the air filter and gently vacuum dust from the evaporator fins.
• Sensor check: If P1 remains constantly and the unit never resumes dehumidifying, inspect the evaporator NTC sensor for proper attachment and operation (see E2).