Comfortmaker
High Inrush Current / Electrical Supply Issue
Furnace causes lights to dim or flicker when starting.
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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
Blower or inducer motor drawing high startup current, Weak electrical service or shared circuit, Failing motor on Comfortmaker furnace, Loose neutral in electrical panel
How to Fix / Troubleshooting
Safety: Electrical panel work should be done by a qualified electrician. Do not remove panel covers if you are not trained.
Steps:
- Observe pattern: Note whether dimming occurs when the blower starts, inducer starts, or both.
- Check other loads: Reduce other large loads (space heaters, microwaves) on the same circuit.
- Inspect motor operation: Listen for slow or labored starts from the blower or inducer, which indicate failing motors.
When to call a technician: A technician or electrician should measure motor current draw and inspect the home's electrical service and furnace circuit.
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Repair Difficulty
Medium
3/5
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