Name: Saunier Duval Combitek F23 PCB Ref. 05712700
Brand: Saunier Duval
SKU: PLCCOTK23
Price: 135 EUR
Availability: InStock

Question 1

How do I confirm that this PCB is the correct one for my boiler?

Accepted Answer

Check the silkscreened reference 05712700 on your PCB and ensure that your boiler model is on the list of compatible ones; also compare the number and position of the connectors.

Question 2

Which models is this PCB suitable for?

Accepted Answer

It is a PCB shared by several models of the same range (see Compatibility tab). If your model does not appear, send us a photo of the silkscreen and we will confirm it.

Question 3

When installing it, do you need to parameterize or configure anything?

Accepted Answer

If you replace it with the same reference, it is usually sufficient to replicate the jumpers/configuration of the original; after installation, a technician should verify service parameters (type of gas, power settings) and check combustion and safety features.

Question 4

Is it the same as the display or control panel?

Accepted Answer

No. This is the main PCB (controls ignition, modulation, sensor readings, and safety features). The display/user interface is a separate piece; if your fault is with the panel, it is not this PCB.

Question 5

Why does a PCB fault occur and how can I prevent the new one from failing?

Accepted Answer

It is usually due to external causes: voltage spikes, shorts in the pump, fan, or valves, humidity, or poor grounding. Before installing the new one, check peripherals, wiring, and connectors, fix water leaks, and verify polarity and grounding.

Question 6

What does refurbished mean and what coverage does it have?

Accepted Answer

Part removed from an out-of-service boiler, inspected and bench-tested; not factory new. Includes 1-year warranty and 14-day return policy. Delivery within 2–4 working days in the EU.

Question 7

What does fault code F.63 mean in Saunier Duval?

Accepted Answer

EEPROM fault. The EEPROM memory of the PCB is corrupted or unreadable; the self-diagnosis blocks the equipment. Check by measuring the power supplies of the PCB and, if the peripherals are correct, confirm by reprogramming/initializing or replacing the PCB.

Question 8

What does fault code F.64 mean in Saunier Duval?

Accepted Answer

Fault in the electronics / NTC. The analogue-digital converter or the measurement stage of the PCB misinterprets the NTCs (incoherent readings). Verify the actual resistances of the NTC at the board connector and the continuity of the harness; if they are correct and the fault persists, the PCB is faulty.

Question 9

What does fault code F.70 mean in Saunier Duval?

Accepted Answer

Invalid product code (DSN). After replacing the display and/or PCB, the DSN has not been recoded or there are missing/errors in the coding resistor; the board goes into lockout. Check the appliance code in the service menu and recode (d.93) or install the correct resistor/code.

Question 10

What does fault code F.61 mean in Saunier Duval?

Accepted Answer

Fault in control/activation of the gas valve. The driver on the PCB does not deliver the appropriate signal/voltage to the gas valve (or detects it in short circuit). Check continuity of the harness and command voltage/waveform at the terminals of the valve during the ignition attempt; if the valve and wiring are fine and there is no correct command, the cause is the PCB.

Question 11

What does fault code F.28 mean in Saunier Duval?

Accepted Answer

Start-up fault: failed ignition. If the ignition/control stage of the PCB fails (does not excite the spark transformer or does not switch the valve), the burner does not start and F.28 appears. Check spark and control voltage to transformer/valve; if gas, electrodes, and harnesses are OK and there is no excitation from the PCB, the cause is the PCB.

Code	What does it mean?	Cause and diagnosis (this part)
F.63	EEPROM fault.	The EEPROM memory of the PCB is corrupted or unreadable; the self-diagnosis locks the equipment. Verify by measuring the power supplies of the PCB and, if the peripherals are correct, confirm by reprogramming/initializing or replacing the PCB.
F.64	Fault in the electronics / NTC.	The analogue-to-digital converter or the measurement stage of the PCB misinterprets the NTCs (incoherent readings). Verify the actual resistances of the NTC at the board connector and the continuity of the harness; if they are correct and the fault persists, the PCB is faulty.
F.70	Invalid product code (DSN).	After replacing the display and/or PCB, the DSN has not been recoded or there are missing/errors in the coding resistor; the board goes into lockout. Check the appliance code in the service menu and recode (d.93) or install the correct resistor/code.
F.61	Gas valve control/activation fault.	The PCB driver does not deliver the appropriate signal/voltage to the gas valve (or detects it as short-circuited). Check the continuity of the harness and the command voltage/waveform at the valve terminals during the ignition attempt; if the valve and wiring are fine and there is no correct command, the cause is the PCB.
F.28	Start-up fault: ignition failed.	If the ignition/control stage of the PCB fails (does not excite the spark transformer or does not switch the valve), the burner does not start and F.28 appears. Check the spark and control voltage to the transformer/valve; if gas, electrodes, and harnesses are OK and there is no excitation from the PCB, the cause is the PCB.

Saunier Duval Combitek F23 PCB Ref. 05712700

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