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 Displayed	Fault Code	Potential Cause
31	N/A	Primary circuit temperature is displayed and the boiler is in summer mode (d.h.w.)
32	N/A	Primary circuit temperature is displayed and the boiler is in winter mode (d.h.w.)
34	N/A	The d.h.w. temperature is displayed and the boiler is on demand for c.h. & d.h.w. power
46	N/A	Set d.h.w.
65	N/A	Wrench symbol flashing without showing any error means maintenance is required
68 FL	N/A	Boiler stand-by, antifreeze protection activated, hyphens turned on to simulate running
68 FL	N/A	The signal FL is flashing every 1 second, but the boiler is working regularly and the display shows all the icons - Filling request
78	N/A	Set c.h.
88	N/A	Chimney sweep function activated
AF 16	N/A	Anti-frost phase activated by boiler, you will see bP & temperature flashing
AN 11	N/A	AN flashing + number error flashing is a flame detection error
BP 15	N/A	Anti-freeze phase activated by boiler, you will see bP & temperature flashing
CF 68	N/A	3 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 ON	N/A	3 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 04	N/A	The pressure is insufficient and the boiler has stopped with a lock of water error displaying
Flame	N/A	Burner on and the flame is present
Flame with sparks	N/A	Spark on burner ignition
N/A	ER 02 + Reset	Intervention lockout by the safety thermostat
N/A	30c	Boiler is waiting for heat request
N/A	ER 01 + Reset	On safety lockout there has been a lack of burner ignition
N/A	ER 03 + Reset	General lockout
N/A	ER + 14 + Reset	Primary temperature is above 105C or the pump is faulty
N/A	ER + 14 + Reset	Primary temperature is above 150C or the pump is faulty
N/A	Li	During 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/A	ER 10 + Reset	Intervention lockout due to flue probe
N/A	LP	Chimney sweep function activated
PO 35	N/A	Po & temperature flashing - pump activated for the post-circulation phase
Spanner	ER 04+	No water or absence of flow causing a faulty primary circuit
Spanner	ER + 14 +	Absence of flow from temperature gradient (>2K/s)
Spanner	ER 09+	Flue temperature probe NTC faulty
Spanner	ER 08+	External temperature probe NTC faulty
Spanner	ER 07+	d.h.w. temperature probe NTC faulty
Spanner	ER 06+	c.h. temperature probe NTC faulty
Spanner	ER 05+	Fan control system faulty
UU 56	N/A	UU & temperature flashing - delayed burner ignition for setting the system