Ideal
Overheating / High Limit Cycling
Furnace runs for a few minutes then shuts off; blower continues to run with no heat
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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
Clogged air filter, blocked return or supply vents, failing blower motor, dirty heat exchanger on Ideal furnace
How to Fix / Troubleshooting
Safety: Overheating can damage the heat exchanger and create a safety hazard. Do not ignore this symptom.
Steps:
- Replace filter: Locate and replace the air filter with the correct size and type. A severely clogged filter is a common cause.
- Open vents: Ensure all supply and return vents are open and not blocked by furniture or rugs.
- Check blower operation: Listen for the blower starting promptly and running at a steady speed. If it is slow, noisy, or stops intermittently, call a technician.
- Professional cleaning: If the problem persists, the heat exchanger and blower wheel may need cleaning by a qualified engineer.
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Repair Difficulty
Medium
3/5
Required Part
High Limit Thermostat
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