Gibson Voltage Drop / Electrical Interference

Furnace shuts off and on when the blower speed changes or when another large appliance starts

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.

Possible Causes

Shared circuit with other heavy loads, Loose neutral connection, Undersized wiring to Gibson furnace, Sensitive control board reacting to voltage dips

How to Fix / Troubleshooting

Safety first: Electrical panel work should be done by a licensed electrician.

User checks:

Dedicated circuit: Verify the furnace is on its own dedicated breaker and not sharing with large appliances.
Loose connections: Have an electrician check for loose neutrals or hot connections at the panel and furnace junction box.

If voltage issues persist, the electrical supply should be corrected to prevent damage to the furnace control board.

Repair Difficulty

Hard 4/5

Required Part

Line Voltage Wiring Harness

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