Biasi Boiler Error & Common Fault Codes

A boiler fault code can be a daunting sight, but have solace in the fact that the fix may be more straight forward than you think.

We have compiled a table of all the error codes you could potentially get on your Biasi boiler so you can understand what the potential cause of the issue is. Sometimes the fix can be as simple as a reset, but on occasions you will have to get a professional out to see the boiler, if you are still unsure on what the fault code display means then our partnered boiler engineer experts will be able to help, just simply fill out the quote form above!

General Faults & Errors

This section is an overview of all of the types of errors that can occur on a Biasi boilers.

Image DisplayedFault CodePotential Cause
31N/APrimary circuit temperature is displayed and the boiler is in summer mode (d.h.w.)
32N/APrimary circuit temperature is displayed and the boiler is in winter mode (d.h.w.)
34N/AThe d.h.w. temperature is displayed and the boiler is on demand for c.h. & d.h.w. power
46N/ASet d.h.w.
65N/AWrench symbol flashing without showing any error means maintenance is required
68 FLN/ABoiler stand-by, antifreeze protection activated, hyphens turned on to simulate running
68 FLN/AThe signal FL is flashing every 1 second, but the boiler is working regularly and the display shows all the icons - Filling request
78N/ASet c.h.
88N/AChimney sweep function activated
AF 16N/AAnti-frost phase activated by boiler, you will see bP & temperature flashing
AN 11N/AAN flashing + number error flashing is a flame detection error
BP 15N/AAnti-freeze phase activated by boiler, you will see bP & temperature flashing
CF 68N/A3 stars DHW comfort pre-heating function

No information displayed

Check the state in the INFO value cF, although the cF is alternated toe CH temperature value until the function is ended

Enter the function by pressing the buttons 12 and 13 together

Function confirmed as showing on or off alternating for 5 seconds

Functions activated every hour and it's not possible to change the time slot unless a remote control is connected
CF ONN/A3 stars DHW comfort pre-heating function

No information displayed

Check the state in the INFO value cF, although the cF is alternated toe CH temperature value until the function is ended

Enter the function by pressing the buttons 12 and 13 together

Function confirmed as showing on or off alternating for 5 seconds

Functions activated every hour and it's not possible to change the time slot unless a remote control is connected
ER 04N/AThe pressure is insufficient and the boiler has stopped with a lock of water error displaying
FlameN/ABurner on and the flame is present
Flame with sparksN/ASpark on burner ignition
N/AER 02 + ResetIntervention lockout by the safety thermostat
N/A30cBoiler is waiting for heat request
N/AER 01 + ResetOn safety lockout there has been a lack of burner ignition
N/AER 03 + ResetGeneral lockout
N/AER + 14 + ResetPrimary temperature is above 105C or the pump is faulty
N/AER + 14 + ResetPrimary temperature is above 150C or the pump is faulty
N/ALiDuring d.h.w operation the primary circuit has reached temperature limit
N/A-Boiler stand-by, antifreeze protection activated, hyphens turned on to simulate running
N/AER 10 + ResetIntervention lockout due to flue probe
N/ALPChimney sweep function activated
PO 35N/APo & temperature flashing - pump activated for the post-circulation phase
SpannerER 04+No water or absence of flow causing a faulty primary circuit
SpannerER + 14 +Absence of flow from temperature gradient (>2K/s)
SpannerER 09+Flue temperature probe NTC faulty
SpannerER 08+External temperature probe NTC faulty
SpannerER 07+d.h.w. temperature probe NTC faulty
SpannerER 06+c.h. temperature probe NTC faulty
SpannerER 05+Fan control system faulty
UU 56N/AUU & temperature flashing - delayed burner ignition for setting the system