Common problems guide

The most common Biasi Riva Compact 24S (M90E.24S) problems

The faults most likely to send a Biasi Riva Compact 24S (M90E.24S) into lockout — with plain-English causes, what to check first, estimated repair costs and whether you need a Gas Safe engineer.

This model is discontinued. Parts can be harder to source and expensive. If repair costs are mounting, a new A-rated boiler may be the smarter choice.

The 6 most common faults

01

N/A High Engineer

Your boiler has temporarily shut down because the water inside it has become dangerously hot, which usually points to a blockage in the flow.

Est. cost: £150-350
Parts: Circulating Pump, Automatic Bypass Valve, Primary Heat Exchanger

Full guide for N/A

02

E83-181 High Engineer

Your boiler has registered an internal configuration or sensor error related to the combustion chamber components, which requires professional inspection.

Est. cost: £150-300
Parts: PCB, Combustion Chamber Insulation Panel, Wiring Harness

Full guide for E83-181

03

E83-142 High Engineer

Your boiler has failed to ignite properly and has locked out for safety reasons.

Est. cost: £150-350
Parts: Ignition electrode, Gas valve, Printed Circuit Board (PCB)

Full guide for E83-142

04

E01-204 High Engineer

Your boiler has detected an issue related to the domestic hot water heat exchanger, which may cause your hot water to stop working properly.

Est. cost: £150-350
Parts: Plate heat exchanger, Flow sensor, Diverter valve

Full guide for E01-204

05

E01-205 High Engineer

Your boiler has detected an issue related to the hot water heat exchanger, which may prevent your hot water from working properly.

Est. cost: £150-300
Parts: DHW Heat Exchanger, NTC Sensor, Flow Switch

Full guide for E01-205

06

E00-684 High Engineer

Your boiler has stopped working because it cannot detect water flowing properly through the internal heating system.

Est. cost: £120-250
Parts: Flow switch, Flow switch microswitch, Wiring harness

Full guide for E00-684

Parts most often replaced

on the Biasi Riva Compact 24S (M90E.24S)

Circulating PumpAutomatic Bypass ValvePrimary Heat ExchangerPCBCombustion Chamber Insulation PanelWiring Harness

Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.

Call a Gas Safe engineer if…

You can smell gas or see signs of a leak
The Biasi shows an Emergency or High severity code
The boiler keeps locking out after repeated resets
You've tried the DIY checks and the fault hasn't cleared
There's visible water leaking from the boiler
The flame is yellow or orange instead of blue

See the full 23-code list for the Biasi Riva Compact 24S (M90E.24S)