Softener emits a constant humming or buzzing noise from the control head even when not regenerating.

Safety first: Unplug the unit before removing the control cover. Do not touch live electrical parts.

Step-by-step:

• 1. Isolate the source: With the cover removed (and power briefly restored), carefully listen to identify whether the hum comes from the AquaHouse power transformer or the drive motor.
• 2. Tighten mounts: Unplug again and tighten any loose screws or brackets securing the transformer or motor.
• 3. Inspect for overheating: Check for discoloration or a burnt smell around the transformer. Replace the AquaHouse power adapter or internal transformer if suspect.
• 4. Check control signals: If the motor hums continuously, the control board may be partially energizing it. Replace the main control board if the motor is being driven when it should be idle.