Honeywell Unstable transfer switch operation under load

Generator transfers power but drops out or chatters under load

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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

Loose power lugs in ATS, Weak ATS contactor coil, Voltage sensing thresholds misadjusted, Excessive voltage drop on generator feed conductors

How to Fix / Troubleshooting

Safety first: De-energize both utility and generator sources and lock out before opening the ATS. Use proper PPE.

Steps:

  • Tighten connections: Inspect and torque all line and load lugs in the Honeywell ATS to manufacturer specifications.
  • Inspect contactor: Look for pitted or burnt contacts and signs of overheating. Replace the contactor if damaged.
  • Check sensing: Verify that the ATS control board is correctly sensing generator voltage and frequency. Replace the board if it misreads stable power.
  • Conductor sizing: Ensure the conductors between generator and ATS are properly sized to minimize voltage drop at full load.
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Repair Difficulty

Professional Required 5/5

Required Part

Honeywell ATS Control Board
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