What does fault code E50 mean on Biasi?

OpenTherm communication anomaly. Communication interface fault (OpenTherm) on the PCB or bus loss; verify by disconnecting the remote/OT, checking wiring and voltages at the OT terminals of the PCB; if it persists, the PCB is damaged.

What does fault code E89 mean on Biasi?

Internal error (typically hardware). Internal fault of the PCB (micro/memory/regulators) or electrical network out of tolerance; check network quality and voltages 230V/5V/3.3V on the PCB, and if they are correct, replace the PCB.

What does fault code E99 mean in Biasi?

Board not configured. PCB not parameterized or with lost/incorrect configuration after replacement; verify and initialize parameters/model according to manual (or BCC/ID if applicable); if it does not accept configuration, the PCB is defective.

RefurbishedBiasi PCBs (control boards)

Biasi Savio 120M PCB

Name: Biasi Savio 120M PCB
Brand: Biasi
SKU: PLCSAV120M
Price: 65 EUR
Availability: InStock

Ref. 2000802038, S1047000

65 €VAT includedIn stock · 2 units

PCB (control board): refurbished spare part that controls the ignition, modulation, and safety features of the boiler. Useful if the boiler does not ignite, locks out, or the display is unresponsive. Reference 2000802038, S1047000. Includes a one-year warranty and delivery within 2–4 working days in the EU.

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Delivery in 2–4 working days

1-year warranty

14-day return

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Key Data

Reference: 2000802038, S1047000
Brand: Biasi
Type of part: PCBs (control boards)
Available units: 2 units in stock
Status: Refurbished
Warranty: 1 year
Shipping: 2–4 working days (EU)
Return: 14 days

Fault codes related to this part (not the entire boiler). They usually have more possible causes: first rule out electrodes, wiring/connections, and gas supply. Verified with ≥3 sources.

Code	What does it mean?	Cause and diagnosis (this part)
E50	OpenTherm communication anomaly.	Communication interface fault (OpenTherm) on the PCB or bus loss; verify by disconnecting the remote/OT, checking wiring and voltages at the OT terminals of the PCB; if it persists, the PCB is damaged.
E89	Internal error (typically hardware).	Internal fault of the PCB (micro/memory/regulators) or electrical network out of tolerance; check network quality and voltages 230V/5V/3.3V on the PCB, and if they are correct, replace the PCB.
E99	PCB not configured.	PCB not parameterized or with lost/incorrect configuration after replacement; verify and initialize parameters/model according to the manual (or BCC/ID if applicable); if it does not accept configuration, the PCB is defective.