Biasi Riva Compact 28S (M90E.28S) Fault codes & diagnostics

1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 28 kW 2002 onwards Discontinued
GC Number 47-970-18

Replaced by: Advance

Download the Biasi Riva Compact 28S (M90E.28S) manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Versions & GC numbers

Which version do you have?

The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.

GC number Appliance (register name) Produced
47-970-18 Riva Compact M90E.28S 2002–present
Fault codes

All 1 documented codes

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10

Your boiler has detected that the water pressure inside the system is currently too low for it to operate safely.

High DIY-safe £0-80

What to check first

  1. Locate the external filling loop, usually found underneath the boiler.
  2. Open the filling valve slowly until the pressure gauge on the front of the boiler reaches 1.0 to 1.5 bar.
  3. Close the valve tightly to stop the flow of water and reset the boiler.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure gauge

Related codes

Full explanation for 10