Vaillant Boiler F84 Fault Code: Causes & How To Fix
The Vaillant boiler F84 fault code means the flow and return temperature sensors are giving readings that don’t make sense together, so the boiler locks out. It’s usually down to…
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Posts by Tim Wilson
Vaillant Boiler F54 Fault Code: Causes & How To Fix
The Vaillant F54 fault code means your boiler isn’t getting enough gas, or enough gas pressure, to light and run safely. It usually shows up alongside F28 or F29, because…
Read ArticleVaillant Boiler F32 Fault Code: Causes & How To Fix
The Vaillant boiler F32 fault code means the fan isn’t running at the speed the boiler expects, so it has locked out for safety. The fan clears combustion gases out…
Read ArticleVaillant Boiler F72 Fault Code: Causes & How To Fix
The Vaillant F72 fault code means your boiler has spotted a gap between its flow and return temperature readings that makes no sense, so it shuts down. Vaillant’s manuals call…
Read ArticleVaillant Boiler F75 Fault Code: Causes & How To Fix
The Vaillant F75 fault code means your boiler started its pump but didn’t see the expected rise in water pressure, so it locked out to protect itself. On the display…
Read ArticleIdeal Boiler F2 Fault Code: Causes & How To Fix
The F2 fault code means your Ideal boiler has detected that the flow temperature has risen above a safe level, or that the sensor responsible for monitoring it has failed.…
Read ArticleIdeal Logic Boiler FD Fault Code: Causes & How To Fix
The FD fault code is signalling that your Ideal boiler has detected that the fan isn’t reaching or maintaining the speed it expects during operation, and has locked out as…
Read ArticleIdeal Boiler FL Fault Code: Causes & How To Fix
The FL fault code is signalling that your Ideal boiler has either failed to ignite or has lost the flame during operation, and it’s locked out as a result. Ignition…
Read ArticleIdeal Boiler F3 Fault Code: Causes & How To Fix
The F3 fault code means your Ideal boiler has detected a problem with the flow and return temperature readings, usually because the difference between them has become too great or…
Read ArticleIdeal Boiler F1 Fault Code: Causes & How To Fix
The F1 fault code means your Ideal boiler has detected that your system’s water pressure has dropped too low for it to operate safely. Boilers rely on a set amount…
Read ArticleIdeal Boiler L2 Fault Code: Causes & How To Fix
The L2 fault code means your Ideal boiler has detected a problem with the fan and has locked itself out as a safety precaution. The fan plays a key role…
Read ArticleBritish Gas New Boiler Cost & Installation Prices for 2026
British Gas is one of the most recognisable names in UK home heating — and for many homeowners, it’s the first port of call when a boiler needs replacing. As…
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