Ravenheat
Short Cycling / Premature Shutdown
Furnace starts then shuts down after a few seconds without showing an error code.
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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
Oversized furnace relative to system, Faulty thermostat placement, Blocked filters or restricted airflow, Over-sensitive limit thermostat
How to Fix / Troubleshooting
Safety: Repeated short cycling can damage components and reduce efficiency.
User checks:
- Ensure supply and return vents are open and unobstructed.
- Check that the thermostat is not located above a radiator, in direct sunlight, or near a heat source.
- Replace or clean air filters in ducted systems.
Technician checks:
- Assess system design and furnace sizing.
- Check operation of limit thermostats and NTC sensors.
- Verify correct fan speed and airflow.
- Adjust control parameters if available to reduce cycling.
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Repair Difficulty
Medium
3/5
Required Part
Overheat Thermostat
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