Updated: 6 May 2025

Biasi Boiler Error Codes / Fault Codes List

Boilers

By: Andrew Bevan

Andrew Bevan

Head Copywriter

Key Takeaways

A Complete List of Biasi Boiler Error Codes
The History of Biasi
Biasi UK Reviews
Find Your Biasi Error Code
A Complete List of Biasi Boiler Manuals

We have a complete list of Biasi boiler error codes for every boiler.

Biasi has over 74 years of manufacturing experience. But does that mean they make great boilers? If you’re viewing this page you are probably cursing your Biasi boiler for breaking down and flashing a fault code at you that makes no sense.

That’s what this Biasi fault code article is for. We will list every error code for every Biasi boiler so that you can identify what the problem is with your Biasi boiler to allow you to get an idea of how much it’s going to cost to fix (if it’s out of warranty).

If your boiler is getting on in years or it’s not the first time it’s broken down and you think that any more money put into fixing your boiler would be wasted money; then get a new boiler quote from WarmZilla. It only takes a few minutes of answering some simple questions online about your home and we’ll show you a list of boilers suitable for your heating needs.

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In 1938 Leopoldo Biasi opened a small thermomechanical business in Italy. In the 1940s he opened a facility to manufacture residential boilers. Biasi UK was formed in 1990 to promote boilers, towel rails, and radiators throughout the UK.

Biasi boilers don’t have a great reputation amongst heating engineers as being particularly reliable, but heating engineers all have different opinions on what boilers are good or bad. So what do customers think about Biasi boilers?

If we take a look at Biasi UK reviews over on Trustpilot, it doesn’t look too bad at first glance. 4.1 out of 5 is a pretty solid score. However, 21% of Biasi reviews on Trustpilot are bad, which is a bit concerning. It seems that amongst customers, Biasi boilers divide opinion, many are happy with their boiler and the customer service and some curse them just as loudly.

Biasi offers a range of combi and system boilers with different kW options to suit different sized homes. Biasi is a budget boiler brand, so they are quite cheap but they aren’t as reliable as more premier boiler brands such as Worcester Bosch.

Now that you have a bit of background on Biasi boilers, let’s get into the Biasi boiler error codes. We provide these error codes to help you identify the issue with your boiler and hopefully fix it yourself. If you identify an internal issue with your Biasi boiler then you will need to contact a Gas Safe Engineer to come and take a look.

Biasi boilers come with a warranty length of between 5 and 7 years depending on which model you choose. If you’re in warranty, get in touch with Biasi and see if you can get them out to take a look (and hopefully fix) your boiler.

Check out the table below to find your Biasi error code and see what the fault code on your Biasi boiler relates to. Biasi fault codes are generally the same across all their boilers, which makes it easier to identify the issue with your boiler. If you can’t find your fault code in the list below then we have listed every single Biasi boiler manual below that, the answers you seek shall be there!

Fault Code	Boiler Fault
ER 01 + Reset	Lack of burner ignition on safety lockout
ER 02 + Reset	Safety thermostat intervention lockout
ER 03 + Reset	General lockout
ER 04 +	Faulty primary circuit (no water or absence of flow)
ER 05 +	Faulty fan control system
ER 06 +	Faulty Central Heating temp. probe NTC
ER 07 +	Faulty Domestic Hot Water (DHW) temp. probe NTC
ER 08 +	Faulty external temp. probe NTC
ER 09 +	Faulty flue temp. probe NTC
ER 10 + reset	Flue probe intervention lockout
N/A	Flame detection error (An flashing + number error flashing)
ER 12+	Faulty central heating temperature probe NTC
ER 13 +	DT Delivery return >40k
ER + 14 + Reset	Faulty pump or primary temperature above 105°C
ER + 14 + Reset	Faulty pump or primary temperature above 105°C
ER + 14 +	Absence of flow from temperature gradient (>2K/s)
ER + 19 +	Domestic hot water inlet probe failure (if sent)
ER + 25 + Reset	Flame detection fault
ER + 69	Wiring fault lockout
Li	Primary circuit temp. limit during domestic hot water operation
—	Boiler Stand-By, hyphens are turned on in sequence to simulate running/antifreeze protection activated)
N/A	Boiler Stand-By, hyphens are turned on in sequence to simulate running/antifreeze protection activated)
N/A	Filling request: The boiler works regularly and the display shows all the icons, but the signal FL is flashing every 1 sec.
30c	Boiler waiting for heat request
N/A	Boiler in summer mode (d.h.w.). The primary circuit temperature is displayed.
N/A	Boiler in winter mode (c.h.+ d.h.w.) The primary circuit temperature is displayed.
N/A	Boiler on demand for d.h.w. power. The d.h.w. temperature is displayed. / Boiler on demand for c.h. power.
N/A	Burner ignition (spark)
N/A	Flame present (Burner on)
N/A	Pre-heating function 3 starts DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function by pushing buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected).
N/A	Pre-heating function 3 starts DHW comfort. This information is not displayed. It will be possible to check its state in the section “INFO” value “cF” (the signal “cF” is alternated to the CH temperature value until the end of this function). You can enter the function by pushing buttons 12 and 13 together. The function is confirmed showing ON or OFF alternating for 5 sec. This function is always active at every hour (it’s not possible to set the time slots unless a remote control is connected).
N/A	Boiler in anti-freeze phase (bP flashing + temperature flashing)
N/A	Boiler in antifrost phase (AF flashing + temperature flashing)
N/A	Set c.h. (all other symbols are disabled)
N/A	Remote control connected – 1 flash every 4 seconds
N/A	Set d.h.w. (all other symbols are disabled)
N/A	Pump activated for the post-circulation phase (Po flashing + temperature flashing)
N/A	Delayed burner ignition for setting the system (uu flashing + temperature flashing)
N/A	Maintenance required The wrench symbol is flashing (without showing any error)
LP	Boiler in chimney sweep in function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualized: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates.
N/A	Boiler in chimney sweep function. The activation of the chimney sweep occurs configuring the “parameter P09=01” and is visualized: LP= minimum dhw hP= minimum heating cP= maximum heating dP= maximum dhw. The transition occurs with keys 16 (increase) and 15 (decrease) dhw temperature. The writing on the display alternates.

Below is a complete list of Biasi boiler manuals courtesy of our friends over atfreeboilermanuals.com.

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About the Author

Andrew Bevan

Head Copywriter

Andrew is a Gas Safe Engineer who also writes about the boiler and home service industry. With years of hands-on experience under his belt, he now focuses on sharing his knowledge—and making his own tea.

Biasi Boiler Error Codes / Fault Codes List

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