A23
IVT
Sensor calibration / plausibility fault
Furnace shows sensor calibration error; temperatures or pressures appear unrealistic
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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
Incorrect sensor type installed, Wiring cross-connected between sensors, Control board analog input failure, Severe electrical interference
How to Fix / Troubleshooting
Safety: Turn off power before rewiring sensors.
- Confirm sensor types: Verify that all NTC sensors (flow, return, DHW, flue, outdoor) are IVT-approved parts with correct resistance curves.
- Check wiring order: Compare sensor connections at the control board to the IVT wiring diagram to ensure no sensors are swapped between terminals.
- Inspect for interference: Keep sensor cables away from high-voltage or motor cables where possible. Secure loose wiring.
- Reset control: After corrections, perform a full power cycle. If the error persists, the control board may require replacement.
Accurate sensor readings are critical for safe operation; do not ignore calibration errors.
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Repair Difficulty
Hard
4/5
Required Part
IVT main control board
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