Field Actions
DISPATCHAlways disconnect appliance from 230V/400V mains before opening panels. Use CAT III multimeter for circuit testing.
Frequently Asked Questions: Nardi C28
FAQ TREEWhat does error code C28 mean on a Nardi appliance?
Nardi error code C28 indicates: Nardi PVF / PV43 Touch Control Induction & Electronic Flame Gas Cooktop: Operational diagnostic fault code C28 signaled by internal electronics. Current sensing shunt resistor amplifier circuit out of calibration or offset voltage drifted.
What is the root cause of Nardi error code C28?
The primary root cause for Nardi code C28 is: On Nardi kitchen suites engineered with planar induction coils, 100 kΩ surface thermistors, IGBT transistors with fast recovery diodes, 12V fan tachometer, and 230V spark pulse generators: Precision low-inductance shunt resistor value shifted, operational amplifier input offset drifted, or noise Multimeter diagnostic parameter: shunt resistor nominal 10 mΩ to 20 mΩ (0.010-0.020 Ω); op-amp zero-current offset output nominal 2.50V DC..
How do I fix or resolve Nardi error code C28?
To resolve error code C28: Safely de-energize the appliance at the electrical distribution board. Unplug wiring connector from the affected component and verify with a digital multimeter: measure resistance of current sensing SMD shunts with milliohm meter and verify op-amp reference voltage rail. Inspect spade lugs for signs of heat discoloration. Replace defective component, restore electrical supply, and perform system reset: Isolate hob at the electrical fuse board for 90 seconds. Restore power and press the ON/OFF key three times within 5 seconds to clear faults.
Is it safe to clear Nardi error code C28 by resetting power?
Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Nardi code C28 persists, the physical component causing On Nardi kitchen suites engineered with planar induction coils, 100 kΩ surface thermistors, IGBT transistors with fast recovery diodes, 12V fan tachometer, and 230V spark pulse generators: Precision low-inductance shunt resistor value shifted, operational amplifier input offset drifted, or noise Multimeter diagnostic parameter: shunt resistor nominal 10 mΩ to 20 mΩ (0.010-0.020 Ω); op-amp zero-current offset output nominal 2.50V DC. must be inspected or replaced.
How do I test electrical resistance for Nardi code C28 using a multimeter?
Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..
What safety protocol must be followed before servicing Nardi code C28?
Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.
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