Honeywell PCB for Boiler ZW24/30-1AE23 — Ref. 45.807.351-000 REV.C

Junkers boilers compatible with reference 87083002120

PCB with reference 87083002120. 22 verified compatibilities: ZW23-1AE23 and ZW23-1AE31.

Proven compatibility

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

How to check if ref. 87083002120 is the part for your boiler

What determines it is not the boiler model, but the reference printed on the part you already have installed.

1. Find the reference printed on the installed part and check whether it matches the catalogue reference 87083002120. 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.

Symptoms and faults that the PCB 87083002120 resolves.

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 boiler shows no signs of life when the switch is turned on: no display or fan.

  Cause: The PCB is not sending power to the rest of the ignition system.

  Check the main fuse of the boiler and the differential switch of the house before blaming the PCB.

• 02

  It triggers a fault code right at the start of the cycle, and that code does not match any actual fault detected.

  Cause: The control electronics misinterpret a signal or have a damaged output, generating errors that do not correspond to reality.

  Note the code and repeat the start three or four times; if it changes each time, the PCB is the main suspect.

• 03

  The room thermostat is unable to turn on the boiler, but the manual button on the boiler itself does work.

  Cause: The circuit of the PCB that receives the external heat call is damaged, although the rest of the control remains operational.

  Bridge the thermostat terminals directly on the PCB to rule out a wiring issue before replacing it.

• 04

  The boiler starts up well when cold but begins to malfunction or shut down by itself after running for a while.

  Cause: It is a typical pattern of solder joints or components on the PCB that are heat fatigued, which fail when reaching operating temperature.

  Time how long it takes to fail from startup; if it always hovers around the same time, it points more to the PCB than to a specific sensor.

• 05

  The pump or some valve do not activate even though the rest of the ignition sequence proceeds normally.

  Cause: The output relay on the PCB that controls that component may have burned out or become stuck.

  Measure with the multimeter if voltage is reaching the connector of the affected component just when the boiler should activate it.

Fault codes from Junkers that this part resolves.

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.

Data sheet for the Junkers 87083002120 PCB.

Catalogue reference

87083002120

Brand

Junkers

Type of part

PCBs (control boards)

Units in stock

0 units

Status

Refurbished

Warranty

1 year

Shipping

1-2 business days

Return

14 days

Data read on the part and in the manufacturer's documentation

What we have not been able to verify does not appear here.

Manufacturer (brand printed on the label)

Honeywell

PCB code (printed on PCB)

45.807.351-000 REV.C

Voltage / frequency / power

230VAC 50Hz 18VA

Manuals and technical documentation

Official documentation of the boiler, useful for locating the part and cross-referencing the fault codes.

• Junkers ZW23-1AE23 manual (PDF)Document © Junkers, provided as a technical reference.