BoilerFaultCodes
Vaillant Boiler Fault Codes
6,219 fault codes across 59 Vaillant boiler models — explained in plain English.
Premium German heating manufacturer with over 140 years of experience. Popular in UK social housing and new builds.
Just want the most common Vaillant problems?
The top 8 faults across the whole Vaillant range — causes, DIY checks, repair costs.
High-severity Vaillant fault codes
F.00 F.01 F.10 F.20 F.22
Your boiler has lost connection with its internal temperature sensor, meaning it cannot monitor heat levels and has shut down as a safety precaution.
Turbomax Plus 824/828E
Your boiler has stopped working because a sensor that monitors water temperature has lost its connection or stopped sending a signal.
Turbomax Plus 824/828E
Your boiler has detected a loose connection or a fault with the sensor that monitors the temperature of the water returning to the unit.
Turbomax Plus 824/828E
Your boiler has switched itself off because it has become too hot internally and needs time to cool down before it can be used again.
Turbomax Plus 824/828E
Your boiler has detected that there is not enough water pressure in the system to operate safely, causing it to shut down to prevent overheating.
Turbomax Plus 824/828E
All models
59 Vaillant boiler models
Turbomax Plus 824/828E
Combi Discontinued
ecoTEC 65kW
System Discontinued
ecoTEC Pro / ecoTEC Plus
CombiSystem
ecoTEC plus
SystemCombi
ecoTEC
CombiSystem
ecoMAX
Combi Discontinued
ecoTEC exclusive
CombiSystem Discontinued
ecoTEC Pro
Combi
Thermocompact
System Discontinued
Turbomax Pro 28 2E
Combi Discontinued
Turbomax VUW 242/1
Combi Discontinued
ecoFIT Pure 825
Combi
ecoFIT Pure 830
Combi
ecoFIT Pure 835
Combi
ecoFIT Pure 412
Regular
ecoFIT Pure 418
Regular
ecoFIT Pure 425
Regular
ecoFIT Pure 435
Regular
ecoTEC sustain
Combi
ecoTEC Pro 24
Combi Discontinued
ecoTEC Pro 28
Combi Discontinued
ecoTEC Pro 30
Combi
ecoTEC Plus 610
System
ecoTEC Plus 615
System Discontinued
ecoTEC Plus 620
System
ecoTEC Plus 625
System
ecoTEC Plus 630
System
ecoTEC Plus 635
System
ecoTEC Plus 826
Combi
ecoTEC Plus 832
Combi Discontinued
ecoTEC Plus 836
Combi
ecoTEC Plus 840
Combi
ecoTEC Plus 938
Combi Discontinued
ecoMAX 613
System Discontinued
ecoMAX 618
System Discontinued
ecoMAX 622
System Discontinued
ecoMAX 635
System Discontinued
ecoMAX Pro 28E
Combi Discontinued
ecoMAX System 612
System Discontinued
ecoMAX 824E
Combi Discontinued
ecoMAX 828E
Combi Discontinued
Turbomax Plus VUW 242E
Combi Discontinued
Turbomax Plus 828 E
Combi Discontinued
Turbomax Plus VUW 242EH
Combi Discontinued
Turbomax Plus 828
Combi Discontinued
Turbomax 824/828
Combi Discontinued
Turbomax VU 182
Regular Discontinued
Turbomax VU 242
Regular Discontinued
Turbomax VU 282
System Discontinued
Atmomax
Combi Discontinued
Combi Compact 242EB
Combi Discontinued
Combi Compact 282EB
Combi Discontinued
Ecomax Condensing 600/800 series
CombiSystem Discontinued
ecoTEC plus aquaPLUS
Combi Discontinued
Home System
System
Home Combi
Combi
Ecomax Pro 18E / 28E
System Discontinued
Turbomax Plus
Combi Discontinued
Turbomax 242/282 1E
Combi Discontinued
Boiler cover options
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.