BoilerFaultCodes.com

Vokera Syntesi E Fault Codes

Combi Natural GasLPG 25-35 kW 2006-2009 Discontinued
GC Numbers: 47-094-6747-094-6847-094-69

Replaced by: Unica i

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Most common fault codes

01
Your boiler is unable to light the flame needed to heat your water and radiators, often due to a temporary interruption in the gas supply.
May be DIY safe · £100-350
02
Your boiler has reached an unsafe temperature because the water is not circulating correctly through the system.
May be DIY safe · £150-£350
03
Your boiler has stopped working because the pipe that lets exhaust gases out is blocked or the internal sensor that checks for airflow is clogged with dirt.
Gas Safe engineer required · £90-180

All 25 fault codes

Code Severity Plain English
01 High Your boiler is unable to light the flame needed to heat your water and radiators, often due to a temporary interruption in the gas supply.
02 High Your boiler has reached an unsafe temperature because the water is not circulating correctly through the system.
03 High Your boiler has stopped working because the pipe that lets exhaust gases out is blocked or the internal sensor that checks for airflow is clogged with dirt.
04 High Your boiler has detected that the water pressure is too low to operate safely, which is usually caused by a leak or air trapped in the system.
05 High Your boiler is having trouble 'talking' to your wall-mounted thermostat or remote control unit.
06 Medium Your boiler is having trouble measuring the temperature of your hot water, which is likely causing your taps and showers to stay cold.
07 High Your boiler's internal temperature sensor is failing to provide a reading, which means the system has shut down to prevent overheating.
08 High Your boiler has shut down because a temperature sensor has detected that the burner area is getting too hot.
09 High Your boiler's electronic control board has developed a fault, meaning the internal computer can no longer communicate with the rest of the system.
AL10 High Your boiler has tried to start up but cannot light the gas to produce heat or hot water.
AL20 High Your boiler has shut down because its internal temperature has reached a dangerously high level, triggering a safety switch to prevent damage.
AL21 High Your boiler has shut down because a temperature sensor on the burner has detected an issue or has failed.
AL26 High Your boiler has stopped working because it thinks the waste water pipe is full or there is an issue with the sensor that detects blockages.
AL28 High Your boiler has lost its ability to monitor the temperature of the water returning to the system, causing it to stop working for safety.
AL34 High Your boiler has stopped working because the fan that removes waste gases is not spinning at the correct speed or has failed to start.
AL40 High Your boiler has detected that the water pressure is too low to operate safely and has shut down to prevent damage.
AL41 High Your boiler has detected that the water pressure is too low to operate safely and has shut down to prevent damage.
AL52 High Your boiler's internal computer has encountered an electronic failure and cannot safely control the unit.
AL55 High Your boiler’s internal computer has encountered a critical error and can no longer control the heating system safely.
AL60 Medium Your boiler is having trouble measuring the temperature of your hot water, which usually means your taps will only run cold.
AL71 High Your boiler has detected an issue with the sensor that monitors the temperature of the water leaving the unit, causing it to shut down as a safety precaution.
AL73 High Your boiler has stopped working because it cannot correctly measure the temperature of the water coming back from your radiators.
AL79 High Your boiler has likely overheated or a safety sensor is failing, causing the system to lock out to prevent damage.
CO Low Your boiler is currently running in a special engineer-only testing mode for checking gas emissions and is not experiencing a mechanical fault.
d1 & d2 High Your boiler has detected a blockage or a backup of water in the condensation drainage pipe, usually caused by a frozen pipe or a clogged trap.

Status & diagnostic codes

These codes indicate your boiler's operating state or a diagnostic reading — not necessarily a fault. Status codes (S.) mean normal operation; diagnostic codes (D.) are informational readings used by engineers.

Code Type Description
d1 Diagnostic Your boiler's waste water pipe is blocked or frozen, preventing the system from draining properly and causing it to shut down for safety.
d2 Diagnostic Your boiler has detected a blockage or a fault in the system that drains away excess condensation, which has caused it to stop running for safety.

Vokera Syntesi E is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

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