F16
Saunier Duval
Internal EEPROM / Configuration Fault
Furnace shows F16, no heating, may occur after power interruptions
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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
Corrupted configuration data in PCB,Incorrect parameter setting,Power surge damaging memory,Defective main control PCB
How to Fix / Troubleshooting
Safety first: Disconnect power before accessing the control board.
- Reset appliance: Turn power off for at least 30 seconds, then restore. Attempt a standard reset from the user interface.
- Check supply quality: Ensure the furnace is connected to a stable power supply. Avoid sharing circuits with heavy inductive loads that cause voltage dips.
- Parameter check (technician): Using Saunier Duval service tools or key sequences, a technician can verify and, if necessary, reprogram configuration parameters.
- PCB replacement: If EEPROM errors persist, the main PCB is likely defective and must be replaced with a pre-configured Saunier Duval board.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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