Junkers PCB ZSC 35 3 MFA
Refurbished Junkers PCBs (control boards)

Junkers PCB ZSC 35 3 MFA

If your boiler does not start, locks out, or exhibits erratic behavior, a technical diagnosis must confirm if you need the Junkers ZSC 35 3 MFA PCB, reference S1047000. This control board manages functions such as ignition, burner modulation, and safety features of the boiler. It is installed in several models from the ZSC, ZWC, and ZWE ranges, such as the 24-3 MFA and the 35-3 MFA, among others. A technician must confirm through diagnosis if it needs to be replaced when you observe these symptoms, as its malfunction can affect the performance of your boiler.

Type of part
PCBs (control boards)
Status
Refurbished
internal SKU
PLBO174
Warranty
1 year
VAT included Stock · 2 units
Compatibility

Compatible Junkers boilers

PCB. Ten confirmed compatibilities: 24-3 MFA and 24-3 MFK.

Verified compatibility

Boiler modelFamilyVerification
Junkers 24-3 MFAZSCVerified
Junkers 24-3 MFKZSCVerified
Junkers 28-3 MFAZSCVerified
Junkers 28-3 MFKZSCVerified
Junkers 35-3 MFAZSCVerified
Junkers 24-3 MFAZWCVerified
Junkers 28-3 MFAZWCVerified
Junkers 35-3 MFAZWCVerified
Junkers 24-5 MFAZWEVerified
Junkers 28-5 MFAZWEVerified

Can't see your model or have questions? The printed reference takes precedence. How to check it ·

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.

  1. Find the reference printed on the installed part and check whether it matches the catalogue reference —. If it is not visible, do not identify the part by its shape alone.
  2. Check the full boiler model on its data plate and look for it in the model associations on this page.
  3. Compare the connections and physical body with the original part before installation.
  4. If anything is unclear, send us a photo of the marking via WhatsApp before placing your order.
Diagnosis and fault codes

Symptoms that require diagnosis on the PCB

The PCB controls the ignition, modulation, and safety features of the boiler. These are the typical symptoms and what to do:

Common symptoms and faults

  • 01

    The two-digit display is blank, it doesn't even show a dash.

    Cause: The PCB is not receiving power or is not processing the supply, so the display does not show a signal.

    Check the fuse and the voltage at the connector before replacing it.

  • 02

    The display shows a fixed fault code and the boiler does not respond to anything.

    Cause: The microprocessor is locked and cannot execute instructions.

    Cut the power for one minute to force a reset before changing the PCB.

  • 03

    The boiler ignites the flame but turns off after a few seconds.

    Cause: The PCB does not maintain the control signal over the gas valve or the fan.

    Check that the problem does not come from the pressure switch or the ionization sensor before replacing the PCB.

  • 04

    The temperature controls do not respond when turned.

    Cause: The long comb connector has lost contact with the potentiometers or buttons on the panel.

    Check that the comb connector is properly inserted and that there are no bent pins before replacing the entire PCB.

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

Technical sheet: Junkers PCB

Uniclima internal SKU
PLBO174
Brand
Junkers
Type of part
PCBs (control boards)
Units in stock
2 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.

voltage
12V
Frequently asked questions

Frequently asked questions about the PCB (control board)

Is this Junkers ZSC 35 3 MFA PCB (reference PLBO174) compatible with my Junkers ZSC 24-3 MFA?
Yes, the ZSC 24-3 MFA is on the list of boilers compatible with this PCB.
Can I use this PCB for a Junkers ZWC 28-3 MFA?
Yes, the ZWC 28-3 MFA is listed among the boilers compatible with this PCB.
What type of connector does the Junkers ZSC 35 3 MFA PCB have?
The PCB features a long comb connector and a 2-digit display.
How many boiler models are compatible with this PCB?
A total of 10 models are compatible with the Junkers ZSC 35 3 MFA PCB.
Are there documented fault codes for this PCB?
No, there are no documented fault codes for this product.

Spare parts related to Junkers ZSC

Delivery calculated by destination Delivery time shown at checkout
1-year warranty inspected and tested
14-day return uninstalled parts
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Junkers PCB ZSC 35 3 MFA