BoilerFaultCodes.com

Vaillant ecoMAX Pro Fault Codes

System Natural GasLPG 18-28 kW 2002-2006 Discontinued
GC Numbers: 41-044-2441-044-2541-044-26

Replaced by: ecoTEC Plus

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

F.00
Your boiler has stopped working because it can no longer accurately measure the temperature of the water leaving the unit.
Gas Safe engineer required · £90-160
F.01
Your boiler has stopped working because a sensor that monitors the temperature of the water returning to the unit has disconnected or failed.
Gas Safe engineer required · £90-160
F.10
Your boiler has stopped working because an internal temperature sensor has developed an electrical fault and is giving a false reading.
Gas Safe engineer required · £120-£190

All 39 fault codes

Code Severity Plain English
F.00 High Your boiler has stopped working because it can no longer accurately measure the temperature of the water leaving the unit.
F.01 High Your boiler has stopped working because a sensor that monitors the temperature of the water returning to the unit has disconnected or failed.
F.10 High Your boiler has stopped working because an internal temperature sensor has developed an electrical fault and is giving a false reading.
F.11 High Your boiler has stopped working because a sensor that monitors the temperature of the water returning to the unit has detected an electrical fault.
F.20 High Your boiler has become too hot and has automatically shut down to prevent damage or danger.
F.22 High Your boiler has detected that there is not enough water pressure inside the system to operate safely.
F.23 High Your boiler has detected that water isn't moving through the system fast enough, causing a large temperature gap between the outgoing and incoming pipes.
F.24 High Your boiler is heating up too quickly because water isn't flowing through the system properly, causing it to shut down to prevent overheating.
F.25 Emergency Your boiler has automatically shut down because the internal temperature of the exhaust gases has reached an unsafe level.
F.27 High Your boiler thinks a flame is present even when the gas is turned off, which prevents it from starting up safely.
F.28 High Your boiler has tried to start up several times but cannot establish a flame to begin heating your water.
F.29 High Your boiler has lost its flame while running and is struggling to relight itself.
F.41 High Your boiler has detected a problem with the way it receives gas or a communication failure within its internal control board.
F.42 High Your boiler's main control board is struggling to identify which specific model it is due to an electrical communication error.
F.43 High Your boiler is struggling to identify its specific model configuration due to an internal electrical communication error.
F.60 High Your boiler has detected an electrical communication problem with the internal gas valve, which is preventing it from safely lighting the flame for heating and hot water.
F.61 High Your boiler has detected a communication problem between the main computer and the gas valve, meaning it cannot safely light the flame to provide heating or hot water.
F.62 High Your boiler has detected that the gas valve is not closing as quickly as it should, which has caused the system to shut down for safety.
F.63 High Your boiler's internal computer brain has developed a memory error and can no longer process the instructions needed to run safely.
F.64 High Your boiler has stopped working because its internal computer has detected a fault with its temperature sensors or the main control board.
F.65 High Your boiler's internal control board has become too hot and has shut down the system to prevent any electrical damage.
F.67 High Your boiler's control board is receiving an incorrect electrical signal from the flame sensor, meaning it cannot safely confirm if the burner is lit.
F1 High Your boiler has tried to start but could not create or detect a flame, causing it to shut down for safety.
F4 High Your boiler has failed to keep the flame lit and has locked itself out for safety.
F5 High Your boiler has got too hot and stopped working to protect itself, likely because the water isn't moving through the system properly.
F6 High Your boiler has lost its ability to measure the temperature of the water leaving the unit, usually due to a faulty sensor or a wiring issue.
F10 High Your boiler has lost signal from the sensor that monitors the temperature of the water returning from your radiators.
F11 High Your boiler's main internal computer is having trouble communicating with its electronic components, meaning it cannot process instructions to provide heat.
F12 High Your boiler's main control panel is having trouble communicating with the internal display or remote controls.
F13 High Your boiler's computer brain has encountered a serious communication error and can no longer control the heating system safely.
F14 High Your boiler has shut down because it has detected that the water inside is getting much too hot, which is usually caused by a circulation problem.
F16 High Your boiler thinks it still sees a flame even though it has commanded the burner to turn off, which is a safety concern that prevents it from restarting.
F17 High Your boiler has detected that the electrical supply coming into the unit is currently too low for it to operate safely.
F18 Medium Your boiler's control panel has lost communication with the internal system, preventing you from adjusting settings or seeing the boiler's status.
F19 High Your boiler has lost connection with a temperature sensor, meaning it cannot safely monitor the heat of the water going to your radiators.
F20 High Your boiler's internal computer chips are unable to communicate properly due to a software version mismatch.
F24 High Your boiler has shut down because the water returning from your radiators has become too hot, usually due to a lack of water flow through the system.
F25 High Your boiler is heating up too quickly, causing it to shut down to prevent damage from overheating.
F26 High Your boiler has detected that the water is heating up far too quickly or there is a blockage preventing hot water from flowing out of the unit.

Vaillant ecoMAX Pro 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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