PCB V-Group 0020066023 for Saunier Duval ThemaCondens F25 A-1

Application to the exact variant pending confirmation. To be confirmed: It is the PCB that controls the boiler: it manages the ignition, modulation, safety features, and communication. It is suspected if the boiler does not ignite, restarts by itself, or shows nonsensical faults.

Type of part: Saunier Duval
Status: Refurbished
internal SKU: PLC091
Warranty: 1 year

VAT included OUT OF STOCK

Compatibility

Compatible Saunier Duval boilers

Saunier Duval. 0 confirmed compatibilities. There are another 4 models that we are still verifying.

Models pending verification

These models are associated with this reference, but we have not finished verifying them yet, so we do not consider them compatibleIf your boiler is one of them, send us a photo of the part you are going to replace and we will verify it before you purchase.

Saunier Duval Semia Condens F 25 A-1	Saunier Duval	Unconfirmed
Saunier Duval Hermann Micraplus Condens 25-A/1	Saunier Duval	Unconfirmed
Saunier Duval Isotwin Condens F 30-A	Saunier Duval	Unconfirmed
Saunier Duval ThemaCondens F25 A-1	Saunier Duval	Unconfirmed

Can't see your model or have questions? The printed reference takes precedence. How to check it · Send us a photo via WhatsApp.

Guide

How to check if it is the part for your boiler

The part reference, model, and equipment revision must be verified against the manufacturer's documentation.

Please confirm: Look for the codes 0020066023 and 0020092400 and the marking TC-AE (model TC-AE / TL-AE). The reference is usually printed on the circuit or on a sticker on the side.
Compare the number and position of relays and connectors with the photos: note that different versions have been manufactured under the same reference.
Do not confuse it with the display PCB 20084519 or with those for the Micraplus and Semia (0010047388, 202.73.0880).
Confirm the model on the rating plate of your boiler: Registered application: the ThemaCondens F25 A-1.
if they match, call us at 911 17 77 77 with the model of your boiler.

Diagnosis and fault codes

Symptoms that require diagnosis in the Saunier Duval.

Common symptoms and faults

01
The boiler does not ignite, it restarts by itself or shows meaningless faults.
Cause: To be confirmed: they relate it to the PCB. Have a technician confirm it before replacing it.
02
Burnt traces or visible oxidation on the PCB
Cause: It points to the PCB. Check the old PCB visually.
03
The boiler does not ignite when starting and fault code F.28 appears.
Cause: Insufficient gas, condensate siphon blocked or failed ignition.
Have a technician check the gas, the siphon, and the electrode. Do not touch the gas valve.
04
The flame goes out during operation and the boiler tries to ignite several times.
Cause: Dirty ionization electrode, flue gas recirculation or gas cut-off.
Have a technician check the electrode, the flue gases, and the gas supply.
05
Fault codes F.00, F.01, F.10 or F.11 appear on the screen.
Cause: Loose sensor connector, interrupted wiring harness, or faulty NTC sensor.
Have a technician check the connectors first and then the sensor.
06
The boiler does not ignite and shows F.28 after three attempts without flame.
Cause: Flame failure after ignition; the manual points to gas, ignition group, or electronics.
Have a technician check it.
07
The boiler does not ignite and shows F.28.
Cause: Ignition unsuccessful: lack of gas, electrode or ignition transformer.
Check that gas is arriving. If the faults return after three attempts, have it checked by a qualified technician.
08
The boiler is locking and displaying F.22: lack of water in the system.
Cause: Without water or with very little; the pressure sensor or its wiring may also fail.
Fill the heating system. If the pressure drop is frequent, have it checked by an installer.
09
The boiler shows F.10 or F.11: flow or return sensor short circuit.
Cause: NTC sensor faulty or short-circuited cable.
Have a technician check it, who will verify the sensor and wiring.
10
The boiler locks and shows F.49: low current on the eBUS bus.
Cause: Short circuit or overload of the eBUS, or two power supplies with different polarity.
Check the wiring of the thermostat and the polarity of the eBUS. If it returns, have a technician check it.
11
The boiler does not ignite and the display shows a fault code for ignition (F.28 or F.29).
Cause: Flame not detected. The most common causes are low gas pressure or a faulty ignition electrode.
Open the gas shut-off valve and press reset once. If it repeats, have an official technician check it.
12
The fault code F.63 or F.64 appears on the screen, related to the PCB or sensor.
Cause: Fault in the boiler's electronics or in the NTC sensor.
Note the code and model and have it checked by an official technician.

Fault codes Saunier Duval that require diagnosis

Code	Fault	Technical checks
F.28	Start-up fault: the burner does not ignite.	First of all, have a technician check the gas, the condensate siphon, and the electrode. Only point to the PCB if the gas is arriving properly and the ignition is still failing.
F.29	Flame loss during operation: the boiler ignites and then turns off.	Have a technician check the ionization electrode, the flue gases, and the gas supply. Only point to the PCB if the gas and the electrode are fine.
F.00	Interruption of the supply temperature sensor (inlet).	First, check the connectors of the sensor and the PCB, as the manual reviews the sensor before the PCB. If they are fine, the sensor may be faulty. Only check the PCB if the sensor and connectors are okay.
F.01	Interruption of the return temperature sensor.	First, check the connectors of the sensor and the PCB, as the manual reviews the sensor before the PCB. If they are fine, the sensor may be faulty. Only check the PCB if the sensor and connectors are okay.
F.10	Short circuit in the supply temperature sensor (inlet).	Have a technician check the sensor and the wiring harness. Only point to the PCB if the sensor and wiring are fine.
F.11	Short circuit in the return temperature sensor.	Have a technician check the sensor and the wiring harness. Only point to the PCB if the sensor and wiring are fine.
F.20	Safety disconnection due to overheating.	Do not reset repeatedly. Notify the technician. It may indicate a lack of water circulation or a faulty sensor.
F.27	Flame detection error with the burner off.	Have a technician check it: it points to the flame control electronics.
F.22	Disconnection due to lack of water in the installation.	Fill the heating system. If the pressure drop is frequent, have it checked by an installer.
F.49	eBUS communication error: current too low.	Check the wiring of the thermostat and the polarity of the eBUS. If it returns, have a technician check it.
F.63	EEPROM memory error on the PCB.	Fault in the electronics: have it checked by a technician.
F.64	Electronic fault, sensor or analog-to-digital converter.	Check sensors and connectors. If it happens again, have a technician check it.
F.65	Temperature of the electronics too high.	Check the ventilation around the boiler. Have a technician review it.
F.67	Invalid flame value returned by the ASIC.	Fault in the electronics: have it checked by a technician.
F.68	Unstable flame (analog input).	Check gas and electrode. Have a technician review it.
F.70	Invalid product code (DSN).	It appears when changing the PCB or screen without readjusting the product code. Have a technician check it.
F.71	Fault of the supply or return temperature sensor.	NTC sensor incorrectly installed or faulty. Have it checked by a technician.
F.72	Deviation of the water pressure sensor or the return sensor.	Check pressure and sensor. Have a technician review it.
F.73	Water pressure sensor not connected or short-circuited.	Check the connector and cable of the sensor. Have a technician review it.
F.74	Electrical problem with the water pressure sensor.	Pressure cable or sensor. Have it checked by a technician.
F.75	Pressure sensor fault (defective pressure capsule).	Pressure sensor. Have it checked by a technician.
F.85	Temperature sensor fault: improperly mounted or loose sensors.	Check that each sensor is in its pipe. Have a technician check it.

These symptoms can have more than one cause. If your boiler displays a fault code, send it to us via WhatsApp along with a photo of the labeling, and we'll tell you if this is the part.

Technical data

Saunier Duval

Uniclima internal SKU: PLC091
Brand: Saunier Duval
Type of part: Saunier Duval
Units in stock: 0 units
Status: Refurbished
Warranty: 1 year
Shipping: Delivery time shown at checkout
Return: 14 days

Part data and available documentation

Contrast the label codes, PCB, and revision with the installed part; they are not necessarily equivalent references.

Inventory — RT24V Connection: 24 V
Inventory — SCHRACK RT424F12 relay: 12 VDC
Inventory — SCHRACK Relays: 24 VDC 6 A / 250 VAC
Inventory — Fuse/position F1: T2
Inventory — Application indicated in inventory: Saunier Duval ThemaCondens F25 A-1
Inventory — PCB Marking: 0020092400; TC-AE
Data of — Function: Manages ignition, modulation, safety features, and communication.
Manufacturer information for the relay — Relay RT424F12: 2-coil bistable relay · 2 switched contacts · 8 A contact rating · TE Connectivity (Schrack)
Identification — Marked code: 0020066023
Identification — Marked code: 0020092400
Identification — Marked code: TC-AE
Inventory data — RT24V connection: 24 V
Inventory data — SCHRACK RT424F12 relay: 12 VDC
Inventory data — SCHRACK relays: 24 VDC
Inventory data — SCHRACK relays: 6 A / 250 VAC
Inventory data — Fuse/position F1: T2
Inventory data — Application indicated in inventory: Saunier Duval ThemaCondens F25 A-1
Inventory data — PCB marking: 0020092400; TC-AE
Pending applications to verify: Saunier Duval Thema Condens F25 A-1 — compatibility cited; pending confirmation. Consultation 24/10/2026 · 1 supplier; pending confirmation: Isotwin Condens F 30-A; THEMACLASSIC F 26 E; Thema Condens 25-A; Thema Condens AS 25-A; Thema Condens AS 30-A; Thema Condens F 25; Thema Condens F AS 25. Commercial statement for its sheet "PCB Saunier Duval (0020066023) Condens.", no certification of the unit. Confirm OEM reference, revision, configuration, and equipment variant before use.

Before purchasing

To confirm: it is advisable to check the electrical input voltage to the house beforehand.
To confirm: Saunier Duval Semia Condens F 25 A-1; 0010047388 or 202.73.0880 for the Semia Condens 25/30.
To confirm: Hermann Micraplus Condens 25-A/1; 0010047388, 202.73.0880 or 288.90.0201
To confirm: Saunier Duval Isotwin Condens F 30-A — 1 origin
Do not confuse: 20084519 — Display PCB of the Thema Condens F25 — It is another part, the screen; do not link it to 0020066023.
Do not confuse: 0010047388 — PCB of the Hermann Micraplus Condens 25 — Different code; it connects to 0020066023.
Do not confuse: 202.73.0880 — PCB for Hermann Micraplus Condens and Semia Condens 25/30 — Different code; it is not linked to 0020066023.
Do not confuse: 288.90.0201 — Hermann PCB for Micraplus Condens 25-A and 30-A — Different code; it is not linked to 0020066023.
Do not confuse: SD0010028087 — PCB for Thema Condens F25 / F25 A1; another list 0010028087 as "carte principale" of the Thema Plus Condens F 25 — None links it to 0020066023: it is not a proven equivalent.
Do not confuse: 0020172942 — "Printed circuit" in the breakdown of the Themaplus Condens F25 A-1 — Another code; the breakdown does not link it to 0020066023.
Do not confuse: 0020084517 — "Interface card" in the same parts list of the Themaplus Condens F25 A-1 — Another code; the parts list does not link it to 0020066023.
A forum cites 0020092400 as the BMU 02 PCB of a Protherm Gepard 23 MOV, another boiler. Here is the circuit marking next to TC-AE: also compare 0020066023.
0020066023 is linked to the Thema Condens F25 A/1; Semia and Micraplus, also 2. No official breakdown mentions the code; 0020092400, TC-AE and TL-AE are not connected to this PCB without additional confirmation.
Pending confirmation of registered applications by model, variant, or programming: Saunier Duval ThemaCondens F25 A-1.

Frequently Asked Questions

Frequently asked questions: Saunier Duval

Where is the code for this PCB and which one should I compare?

In the circuit, 0020066023 and 0020092400 are marked, as well as TC-AE (indicating the model as TC-AE / TL-AE). The reference 0020066023 is usually printed on the circuit or on a sticker on the side. Compare all the markings, not just one.

Is it compatible with my Saunier Duval ThemaCondens F25 A-1?

The compatibility of this variant is pending confirmation. Registered application: this PCB for the ThemaCondens F25 A-1. Additionally, the 0020066023 is provided for the Thema Condens F25 A/1 (no official breakdown mentions the code). Nevertheless, compare relays and connectors with the photos.

Is it compatible with the Semia Condens F 25 A-1, the Hermann Micraplus Condens 25-A/1, or the Isotwin Condens F 30-A?

The compatibility of this variant is pending confirmation. To be confirmed. They provide 0020066023 for the Semia and Micraplus (the third one is missing); the Isotwin Condens F 30-A is only mentioned. Additionally, other PCBs. Semia Condens: 0010047388 or 202.73.0880. Micraplus Condens: 0010047388, 202.73.0880 or 288.90.0201. Send us a photo of the PCB and the boiler's data plate from Contact, or call 911 17 77 77.

What do 0020066023, 0020092400, TC-AE, and TL-AE mean?

0020066023 is the reference with which this PCB is sold for the Thema Condens F25 A/1; it is referred to as OEM reference. 0020092400 and TC-AE are markings of the circuit of this unit, and it indicates the model as TC-AE / TL-AE. Without additional confirmation, TC-AE or TL-AE cannot be linked to this PCB or 0020092400.

Is it the same as 20084519, 0020172942, 0020084517, or SD0010028087?

We don't know. 20084519 is a display PCB for the Thema Condens F25. The parts list for the Themaplus Condens F25 A-1 includes 0020172942 "Printed circuit board" and 0020084517 "Interface card". SD0010028087 for the Thema Condens F25 and F25 A1. Without additional confirmation, they are linked to 0020066023.

What relays and fuse does it have and why is it advisable to compare them?

indicate: Schrack relay RT424F12 of 12 VDC, Schrack relays of 24 VDC and 6 A / 250 VAC, fuse F1 T2 and connection RT24V of 24 V. TE Connectivity describes the RT424F12 as a bistable relay with 2 coils and 8 A contacts. Note that under the same reference there are versions with different relays and connectors: compare them with those on your PCB.

Who should install it and what should be on hand?

Have a qualified technician install it: it controls a gas boiler. It indicates that the PCB is configured according to the model and version of the boiler: have the exact model of yours ready.

How to identify this PCB?

Compare the silkscreen, the distribution of the connectors, and the exact variant of the circuit with the photographs.

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PCB V-Group 0020066023 for Saunier Duval ThemaCondens F25 A-1