Stop AC Coil Freeze to Prevent Furnace Flooding

Cost Savings

Checklist Tasks

• Shut off the thermostat to halt cooling and prevent more coil ice.
• Switch off furnace and AC breakers at the panel to prevent shock hazard.
• Remove the furnace panel and check for water or soaked insulation beneath coil.
• Remove standing water with a wet/dry vacuum from furnace base and floor.
• Place towels or pads under coil area to catch drips as ice thaws.
• Photograph visible water damage or corrosion for insurance records.
• Check the condensate drain for clogs or kinks to prevent future overflow.
• Inspect evaporator coil for ice and allow it to thaw naturally.
• Examine circuit boards and wiring for water or corrosion signs.
• Replace or dry wet furnace filters to restore airflow.
• Test float switch to confirm it shuts off power if drain pan fills.
• Schedule an HVAC technician to check system before restarting.