Biasi Riva Compact 28S Fault codes & diagnostics

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

Combi Natural Gas 28 kW 2010-2017 Discontinued

Replaced by: Advance

The fault code is already on your display

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

Severity at a glance

Each cell = one fault code. Hover to identify.
10 High
Just want the most common Biasi Riva Compact 28S faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 10 documented codes

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30c

Your boiler has detected that the water temperature has risen too high and has shut down as a safety precaution.

High DIY-safe £100-220

What to check first

  1. Check that your radiator valves are open and not turned to zero.
  2. Wait for the boiler to cool down for at least 30 minutes.
  3. Press the reset button on the front control panel to clear the fault.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger (Cleaning)
Full explanation for 30c
ER + 14 + Reset

Your boiler has likely detected a safety issue with the circulation or a system blockage, causing it to shut down to prevent overheating.

High Engineer only £100-£350

Parts commonly replaced

  • Flow Thermistor
  • Circulation Pump
  • Main PCB
Full explanation for ER + 14 + Reset
ER + 25 + Reset

Your boiler has likely stopped heating because the internal water pressure has dropped too low or there is a blockage preventing water from circulating properly.

High DIY-safe £80-220

What to check first

  1. Locate the pressure gauge on the front of the boiler
  2. If the needle is below 1 bar, use the filling loop underneath the boiler to increase pressure to 1.5 bar
  3. Turn the selector switch to 'Reset' for 5 seconds and then back to 'On/Winter' mode

Parts commonly replaced

  • Circulation Pump
  • Primary Heat Exchanger
  • Pressure Switch
Full explanation for ER + 25 + Reset
ER + 69

Your boiler has stopped working because it has detected an electrical connection issue or a fault with its internal control board.

High Engineer only £180-350

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Wiring Harness
Full explanation for ER + 69
ER 01 + Reset

Your boiler has failed to light the gas flame or cannot detect that it is lit, causing the system to shut down for safety.

High DIY-safe £100-£320

What to check first

  1. Check that your gas supply is turned on and other gas appliances are working
  2. Press and hold the reset button for a few seconds
  3. If you have a prepaid meter, ensure you have sufficient credit

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Printed Circuit Board (PCB)
Full explanation for ER 01 + Reset
ER 02 + Reset

Your boiler has overheated, causing a safety cutout to stop the system from running.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the boiler pressure is between 1 and 1.5 bar
  3. Press and hold the 'Reset' button for 2-3 seconds to restart the system

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger
Full explanation for ER 02 + Reset
ER 03 + Reset

Your boiler has detected a problem with how it releases exhaust gases or takes in fresh air, causing it to shut down for safety.

High Engineer only £100-£280

Parts commonly replaced

  • Air Pressure Switch
  • Fan
  • Venturi Tube
Full explanation for ER 03 + Reset
ER 10 + reset

Your boiler has detected that the water pressure is too low, causing it to shut down for safety.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually a silver flexible hose) underneath the boiler.
  2. Slowly open the valve(s) to allow water into the system while watching the pressure gauge.
  3. Close the valves once the needle reaches between 1.0 and 1.5 bar, then press the reset button.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel
Full explanation for ER 10 + reset
Li

Your boiler has failed to ignite properly, meaning there is no flame to provide heating or hot water.

High DIY-safe £100-280

What to check first

  1. Check if your gas credit has run out or if other gas appliances are working
  2. Turn the selector knob to the 'R' position for a few seconds to reset the boiler
  3. Repeat the reset procedure up to three times if the fault persists

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • PCB
Full explanation for Li
LP

Your boiler has detected that the water pressure is too low, which prevents it from operating safely to protect its internal components.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (the flexible silver hose) underneath the boiler.
  2. Slowly open the valve(s) until you hear water entering the system.
  3. Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the valves tightly.

Parts commonly replaced

  • Filling loop
  • Pressure switch
  • Expansion vessel
Full explanation for LP