Boiler Guides

A D5 on a Worcester Bosch usually means the condensate is not draining away properly, and on most boilers that comes down to a blocked or frozen condensate pipe. We’re…

An FA on a Worcester Bosch display means the boiler still senses a flame after the gas valve has closed, which is the sort of fault that deserves a careful…

If your Worcester Bosch is showing 229, it has lost its flame partway through a heating or hot water cycle and shut down, and in cold weather a frozen condensate…

Code 228 on a Worcester Bosch is the odd one out in the flame family: instead of failing to find a flame, the boiler believes it can see one when…

A 227 on a Worcester Bosch display means the boiler tried to light, waited for a flame signal and heard nothing back, so it shut itself down to stay safe.…

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…

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…

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…

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…

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…

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.…

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…