Common problems guide

The most common Biasi Riva Compact HE MK2 problems

The faults most likely to send a Biasi Riva Compact HE MK2 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

An High Engineer

Your boiler is failing to light the burner because it cannot detect a flame, meaning your heating and hot water will not work.

Est. cost: £120-250
Parts: Ignition electrode, Flame rectification probe, Printed circuit board (PCB)

Full guide for An

02

E83---121 High Engineer

Your boiler is struggling to manage the water pressure inside the system because an internal component responsible for absorbing pressure changes has failed.

Est. cost: £180-300
Parts: Expansion vessel, Pressure relief valve, Auto air vent

Full guide for E83---121

03

E83---129 High Engineer

Your boiler is failing to detect or control the gas flow properly, which means it has safely shut itself down to prevent ignition issues.

Est. cost: 180-350
Parts: Gas valve, PCB (Printed Circuit Board), Wiring harness

Full guide for E83---129

04

E83---013 High Engineer

Your boiler has detected an issue with the safety valve that monitors pressure, likely requiring a professional to check for leaks or internal component failure.

Est. cost: £120-250
Parts: Pressure Relief Valve (PRV), Pressure Sensor

Full guide for E83---013

05

E83---181 High Engineer

Your boiler has detected an issue with the internal insulation panel inside the main combustion area that needs professional attention.

Est. cost: £150-250
Parts: Combustion chamber rear insulation panel, Insulation kit

Full guide for E83---181

06

E83---142 High Engineer

Your boiler has failed to ignite the gas burner after several attempts, so it has safely shut down to prevent a build-up of unburnt gas.

Est. cost: £150-300
Parts: Ignition electrode, Ignition lead, Gas valve

Full guide for E83---142

Parts most often replaced

on the Biasi Riva Compact HE MK2

Ignition electrodeFlame rectification probePrinted circuit board (PCB)Expansion vesselPressure relief valveAuto air vent

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 22-code list for the Biasi Riva Compact HE MK2