FLUE PROBE – Display of Negative Temperature (-10°C)

FLUE PROBE – Display of Negative Temperature (-10°C)

If in the “INFORMATION” section of the remote control or machine display the flue temperature is shown with a negative value (e.g., -10°C), the condition is generally not real and indicates a reading anomaly.

▿ Most common case: reversed connection

In most cases, the problem is due to the inversion of the flue probe cables on the control unit.

Resolution
• Turn off the stove power supply
• Locate the flue probe cables connected to the control unit
• Reverse the cable connections
• Restore the power supply
• Check that the temperature is displayed correctly with a positive value

▿ Other possible causes

If the problem persists even after checking the wiring, consider the following possible anomalies:

• Faulty or out-of-range flue probe
• Interrupted wiring or loose contact
• Short circuit or electrical interference (e.g., proximity to high voltage components)
• Electronic board malfunction

▿ Recommended verification procedure

1. Visual wiring inspection
   Check the integrity of cables and connectors
2. Probe continuity check
   Measure with a multimeter to exclude interruptions
3. Insulation check
   Verify absence of short circuits or leakage
4. Cable positioning check
   Ensure they are not in contact with power lines
5. Component replacement (if necessary)
   • Flue probe
   • Wiring
   • Electronic board

▿ Technical note

A stable negative reading (e.g., constant -10°C) typically indicates a signal error and not the actual flue temperature.