BoilerFaultCodes An 11
Flame detection error (An flashing + number error flashing
Biasi Advance Plus Fault codes & diagnostics
35 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 25-35 kW 2015 onwards Discontinued
GC Numbers 47-583-3547-583-3647-583-37
Replaced by: Advance Plus 2
Download the Biasi Advance Plus manual
PDF
Versions & GC numbers
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. 9 High
1 Medium
1 Low
24 Unrated
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 |
|---|---|---|
| 47-583-35 | Advance Plus 25C ErP | 2015–present |
| 47-583-36 | Advance Plus 30C ErP | 2015–present |
| 47-583-37 | Advance Plus 35C ErP | 2015–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Biasi Advance Plus faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 35 documented codes
Tap any card for details
Er 01 Your boiler has failed to light the flame needed to heat your home and has safely shut itself down as a precaution.
Your boiler has failed to light the flame needed to heat your home and has safely shut itself down as a precaution.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Ignition lead
Related codes
Er 01 + RESET
Lack of burner ignition on safety lockout
Er 02 Your boiler has detected that it is overheating and has shut itself down to prevent any damage or safety hazards.
Your boiler has detected that it is overheating and has shut itself down to prevent any damage or safety hazards.
Parts commonly replaced
- Limit thermostat
- Pump (circulator)
- Primary heat exchanger
Related codes
Er 02 + RESET
Safety thermostat intervention lockout
Er 03 Your boiler has stopped working correctly because the system has encountered a general safety error and has shut itself down to prevent damage.
Your boiler has stopped working correctly because the system has encountered a general safety error and has shut itself down to prevent damage.
Parts commonly replaced
- Printed circuit board
- Wiring harness
- Ignition transformer
Related codes
Er 03 + RESET
General lockout
Er 04 Your boiler is struggling to detect the water flowing through it, which is likely caused by low system pressure.
Your boiler is struggling to detect the water flowing through it, which is likely caused by low system pressure.
What to check first
- Check your boiler pressure gauge; if it is below 1 bar, find the filling loop (usually a silver braided hose under the boiler).
- Open the valves on the filling loop to allow water into the system until the gauge reads 1.5 bar.
- Close the valves tightly and restart the boiler.
Parts commonly replaced
- Circulation pump
- Flow switch
- Pressure sensor
Related codes
Er 04 +
Faulty primary circuit (no water or absence of flow)
Er 05 Your boiler has detected an issue with the internal fan that pushes exhaust gases out of your home, so it has safely shut itself down to prevent operation.
Your boiler has detected an issue with the internal fan that pushes exhaust gases out of your home, so it has safely shut itself down to prevent operation.
Parts commonly replaced
- Fan assembly
- Wiring harness
- Printed Circuit Board (PCB)
Related codes
Showing 11–20 of 35
Er 05 +
Faulty fan control system
Er 06 Your boiler is struggling to accurately measure the temperature of the water used for your radiators, which has caused it to stop working to avoid potential damage.
Your boiler is struggling to accurately measure the temperature of the water used for your radiators, which has caused it to stop working to avoid potential damage.
Parts commonly replaced
- Central Heating NTC Temperature Sensor
- Wiring harness
Related codes
Er 06 +
Faulty C.H. temp. probe NTC
Er 07 Your boiler is struggling to accurately measure the temperature of the hot water it provides, which has caused it to stop heating your water to prevent overheating.
Your boiler is struggling to accurately measure the temperature of the hot water it provides, which has caused it to stop heating your water to prevent overheating.
Parts commonly replaced
- DHW NTC thermistor sensor
Related codes
Er 07 +
Faulty D.H.W. temp. probe NTC
Er 08 Your boiler is struggling because it has lost the signal from the weather sensor installed outside your home.
Your boiler is struggling because it has lost the signal from the weather sensor installed outside your home.
Parts commonly replaced
- External NTC sensor
- Wiring loom
Related codes
Er 08 +
Faulty external temp. probe NTC
Er 09 Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust fumes, meaning the system has shut down as a safety precaution.
Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust fumes, meaning the system has shut down as a safety precaution.
Parts commonly replaced
- Flue NTC sensor
- Wiring harness
Related codes
Er 09 +
Faulty flue temp. probe NTC
Er 10 Your boiler has detected that the exhaust gases are getting too hot, so it has safely shut itself down to prevent any damage.
Your boiler has detected that the exhaust gases are getting too hot, so it has safely shut itself down to prevent any damage.
Parts commonly replaced
- Flue sensor
- NTC sensor
- Primary heat exchanger
Related codes
Showing 21–30 of 35
Er 10 + RESET
Flue probe intervention lockout
Er 11
Flame detection error
Er 12
Faulty central heating temp. probe NTC (return)
Er 12 +
Faulty central heating temp. probe NTC (return)
Er 13
Er 13 +
DT delivery-return >40K
Er 14 Your boiler has detected that it is dangerously overheating and has automatically shut down to prevent damage.
Your boiler has detected that it is dangerously overheating and has automatically shut down to prevent damage.
Parts commonly replaced
- Central heating pump
- NTC thermistor
- Printed Circuit Board
Er 14 +
Absence of flow from temperature gradient (>2k/s)
Er 14 + RESET
Faulty pump or primary temperature above 105° C
Er 19
Domestic hot water inlet probe failure (if present)
Showing 31–35 of 35
Er 19 +
Domestic hot water inlet probe failure (if present)
Er 25
Appliance lock-out
Er 25 + RESET
Flame detection error
Er 69
Wiring error lockout
Li 01
Primary circuit temperature limit during D.H.W. operation