Atag Boiler Fault Codes

743 fault codes across 34 Atag boiler models — explained in plain English.

Dutch premium heating manufacturer. High efficiency products for the UK market.

743 fault codes
34 models documented
19 currently sold
15 legacy models

Atag fault codes on this site

We document 743 fault codes across 34 Atag models, covering 115 distinct codes. Atag boilers use a mix of numbered codes and light or status indications. Codes for 33 of these models are taken directly from the manufacturer's own service or installation manual.

Models covered: Q 25CR, Q 30CR, E22c, Premier, Q 25S, A200S, E Range, E32S, Sov., iC Range, iS System, iR Regular, iC28, i24C, i28C, i36C, i40C, i15S, i18S, i24S, i32S, i40S, i15R, i18R, i24R, i32R, i40R, iC Economiser 27 Plus, iC Economiser 35 Plus, iC Economiser 39 Plus, A320S, A203C, A325C, A325ECX.

Codes that appear on the most Atag models:
110 101 102 104 108 1P4
Just want the most common Atag problems?
The top 8 faults across the whole Atag range — causes, DIY checks, repair costs.
Most serious

High-severity Atag fault codes

FILL
Your boiler has automatically stopped working because the water pressure inside your heating system has dropped too low.
Q 25CR
 HIGH
Your boiler has detected that the water pressure inside your heating system is too high and has safely shut itself down to prevent damage.
Q 25CR
 Block 01
Your boiler has detected that an external safety device, such as a heat sensor or chimney flue thermostat, has triggered a shutdown to prevent overheating or unsafe operation.
Q 25CR
 Block 60
Your boiler's internal settings have been incorrectly configured, preventing it from safely regulating its power output.
Q 25CR
 Block 80
Your boiler has automatically paused itself because the waste gases exiting the flue are dangerously hot, likely indicating an internal system blockage or a failed sensor.
Q 25CR
All models

34 Atag boiler models

Q 25CR
CombiSystem Discontinued
53 fault codes · 2007 onwards
Q 30CR
CombiSystem Discontinued
29 fault codes · 2007 onwards
E22c
CombiSystem Discontinued
38 fault codes · 2016-2022
Premier
Combi Discontinued
38 fault codes · 2000-2007
Q 25S
CombiSystem Discontinued
22 fault codes · 2007 onwards
A200S
System Discontinued
32 fault codes · 2008-2016
E Range
CombiSystem Discontinued
15 fault codes · 2013-2018
E32S
System Discontinued
33 fault codes · 2015-2022
Sov.
System Discontinued
19 fault codes · 2000-2009
iC Range
Combi
33 fault codes · 2015-present
iS System
System Discontinued
18 fault codes · 2015 onwards
iR Regular
Regular Discontinued
0 fault codes · 2015 onwards
iC28
Combi
18 fault codes · 2015-present
i24C
Combi
16 fault codes
i28C
Combi
16 fault codes
i36C
Combi
16 fault codes
i40C
Combi
16 fault codes
i15S
System
15 fault codes
i18S
System
15 fault codes
i24S
System
15 fault codes
i32S
System
15 fault codes
i40S
System
15 fault codes
i15R
Regular
16 fault codes
i18R
Regular
16 fault codes
i24R
Regular
16 fault codes
i32R
Regular
16 fault codes
i40R
Regular
16 fault codes
iC Economiser 27 Plus
Combi
16 fault codes
iC Economiser 35 Plus
Combi
16 fault codes
iC Economiser 39 Plus
Combi
16 fault codes
A320S
System Discontinued
32 fault codes
A203C
Combi Discontinued
32 fault codes
A325C
Combi Discontinued
32 fault codes
A325ECX
Combi Discontinued
32 fault codes
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