Monarch Valve Motor or Transformer Hum

Softener emits a constant humming or buzzing noise from the valve head

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Stalled valve motor, Loose mounting of transformer, Resonance in cabinet panels, Motor receiving power continuously due to PCB fault

How to Fix / Troubleshooting

Safety first: Disconnect power before touching the valve head or internal components.

  • Identify source: With the cover removed (and power briefly restored), carefully listen to locate whether the hum comes from the motor, transformer, or another component. Then disconnect power again.
  • Check for motor stall: If the motor is humming but the cam is not moving, the valve may be jammed. Inspect the cam and gear train for obstructions.
  • Tighten transformer: Ensure the transformer is firmly mounted and not vibrating against the cabinet.
  • Replace motor if necessary: A motor that hums continuously without movement is likely failing and should be replaced.
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Repair Difficulty

Medium 3/5

Required Part

Control Valve Motor Assembly
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