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Vaillant boilers employ a number of error codes of which the most common relate to the vent system and its integrated pressure relief valve. In this article we'll take a look at what the codes mean and what you can do to correct any problems associated with them.
Fault codes are codes related to problems in your home's central heating system. They're a tool for diagnosing problems, since they give you a numbered list of the different things that might be wrong with your boiler.
Vaillant boiler error codes will enable you to discover the cause behind the faulty circuitry sooner rather than later. You can then get the boiler repaired quickly, so it's back up and running to heat your home once again. If you are a DIY enthusiast, why not try to diagnose the problem yourself? With a little know-how, you should be able to identify the error code by working through a series of checks.
The Vaillant EcoTEC is a high-quality condensing boiler, which is a great choice for homeowners in areas of the country that experience significant heating seasons. The EcoTEC's energy efficiency capabilities are top-notch, and even better that the technology behind them is user-friendly.
Below is a guide to Vaillant EcoTEC 65kW boiler error codes, and what they mean. These are the error codes displayed on the EcoTEC's electronic control panel. They identify minor and major faults in the system system, or provide information on its status.
Fault Code | Possible Cause |
---|---|
S.O | Heating issue, no heat demand |
S.1 | Fan start-up error |
S.2 | Pump flow error |
S.3 | Heating mode error – ignition problem |
S.4 | Heat mode – burner on error |
S.6 | Heating mode – fan overrun error |
S.7 | Heating mode – pump overrun error |
S.8 | Heating remaining cut off for X amount of time |
S.31 | No heat demand summer operating mode |
S.34 | Heating mode frost protection error |
S.20 | Hot water requirement error |
S.22 | Hot water handling pump flow error |
S.24 | Hot water operation burner is on |
S.85 | Service message quantity of circulation water |
There are many things to check when diagnosing boiler problems. These error codes are only one small part of it. However, it's important to have an understanding of them because they give a good indication of what the fault is and where to start looking for it.
There are a number of problems you can experience with a Vaillant EcoTec Pro or EcoTec Plus boiler. These boilers are more modern and advanced than other heaters, so the error codes tend to be different than other models. Here's a chart of the error code formats for these particular models.
Fault Code | Possible Cause |
---|---|
F.00 / F.0 | Flow temperature sensor interruption |
F.01 / F.1 | Return temperature sensor interruption |
F.10 | Flow NTC short circuit |
F.11 | Return NTC short circuit |
F.20 | Safety switch off temperature limiter |
F.22 | Safety switch off low water pressure |
F.23 | Safety switch off temperature difference too great |
F.24 | Safety switch off temperature is rising to fast |
F.25 | Safety switch off flue gas temperature too high |
F.26 | Error with gas valve – possible no function |
F.27 | Safety switch off flame simulation |
F.28 | Failure during start up – ignition unsuccessful to start |
F.29 | Failure during operation – re-ignition unsuccessful |
F.32 | Fan error |
F.49 | eBUS error – possible short circuit |
F.61 | Error with gas valve regulation |
F.62 | Error with gas valve – switch off delay |
F.63 | EEPROM error |
F.64 | Electronics / NTC error |
F.65 | Electronic temperature error could be overheating due to external influences |
F.67 | Electronics flame signal error |
F.68 | Unstable flame signal error air in gas |
F.70 | Invalid device specific number (DSN) |
F.71 | Flow NTC error – flow temperature sensor signal constant value |
F.72 | Flow return NTC error – temperature difference too great |
F.73 | Water pressure sensor signal in the wrong range, it is too low |
F.74 | Water pressure sensor signal outside correct range, the sensor signal is too high |
F.75 | Error with pressure – no pressure change detection when starting the pump |
F.76 | Overheating protection on – primary heat exchanger has responded |
F.77 | Flue non return flap condensate pump error |
F.78 | Interruption to DHW outlet sensor at external controller |
F.83 | Flow and or return temperature sensor error |
F.84 | Error with flow/return temperature sensor temperature changing error |
F.85 | Error with flow and return temperature, sensor incorrectly fitted |
CONNECTION | No communication with the PCB |
S.00 | Heating mode error – no heat demand |
S.01 | Heating mode fan start-up |
S.02 | Heating mode error – water pump running |
S.03 | Heating mode – ignition sequence error |
S.04 | Heating mode – burner ignited |
S.06 | Heating mode – fan overrun error |
S.07 | Heating mode – pump overrun error |
S.08 | Heating remaining cut off time X minutes |
S.10 | Hot water demand via impeller sensor |
S.11 | DHW mode fan start up error |
S13 | DHW mode ignition error |
S.14 | Hot water demand via fan sensor error |
S.15 | DHW mode pump and fan overrun |
S.16 | DHW mode – fan overrun error |
S.17 | DHW mode – pump overrun error |
S.20 | DHW mode – burner on error |
S.21 | DHW mode – fan start up error |
S.22 | DHW demand – error pump running |
S.23 | DHW ignition error |
S.24 | DHW mode – burner error |
S.25 | DHW mode – pump or fan overrun error |
S.26 | DHW mode – fan overrun |
S.27 | DHW mode – pump overrun |
S.28 | Hot water burner anti-cycling time |
S.30 | Room thermostat is blocking heating mode |
S.31 | No heat demand boiler in summer operating mode |
S.32 | Waiting period because of fan speed deviation |
S.34 | Heating mode frost protection error |
S.39 | Burner off contact has been triggered this could be because of contact thermostat or condensate pump |
S.40 | Comfort safety mode active |
S.41 | Water pressure > 2.8 bar |
S.42 | Flue non return flap return signal blocks burner operation |
S.46 | Comfort safety mode flame loss at minimum load |
S.53 | Boiler is in waiting period of modulation f block function due to water shortage |
S.54 | Boiler is in waiting period of operation, blocking function as a result |
S.57 | Waiting period comfort safety mode |
S.58 | Modulation limitation due to noise / wind error |
S.61 | Gas family check unsuccessful |
EcoTEC Plus Regular gas boilers are a very popular range of heating systems. They have many good features, including: low emissions, high efficiency, small size, and long life. Like the vast majority of boilers they have a self control system which checks the boiler and all the major components regularly and indicates any faults on a control board. Also like all other boilers - and most electrical appliances - EcoTEC Plus error codes can occur for a number of reasons.
The following is a list of common boiler error codes that you may see on your EcoTEC Plus Regular boiler. It's important to remember that some of these codes can be caused by more than one problem, so try to troubleshoot based on the symptom, not just the code.
Fault Code | Possible Cause |
---|---|
S.20 | Warnstar demand |
S.21 | Fan running |
S.22 | Pump running |
S.23 | Ignition sequence |
S.24 | Burner ignited |
S.25 | Fan and water pump running |
S.26 | Fan overrun |
S.27 | Pump overrun |
S.28 | Anti-cycling mode |
S.30 | No heating demand from external controls |
S.31 | Central heating thermostat knob turned off |
S.32 | Heat exchanger antifreeze active as fan speed variation is too high |
S.34 | Anti-frost mode is active |
S.36 | Not heating demand form low voltage |
S.41 | Water pressure greater than 2.9 bar |
S.42 | Response from accessory module or defective condensate pump is blocking burner operation |
S.53 | Appliance is within the waiting period of the block operation function due to water shortage |
S.54 | Appliance is within the waiting period of the block operation due to water shortage |
S.96 | Return sensor error |
S.98 | Flow return sensor check is running demand is block |
D.0 | Heating part load error |
D.1 | Water pump overrun – time for heat mode |
D.2 | Max burner anti-cycling period at 20c flow temperature |
D.3 | Hot water flow temperature reading |
D.4 | Current temperature for warm stat sensor |
D.7 | Warm start temperature target value |
D.8 | External controls heat demand |
D.9 | Flow target temperature from external analogue regulator terminal |
D.10 | Status internal heating pump error |
D,11 | Status external heating pump error |
D.12 | Cylinder charging pump via accessory module |
D.13 | Hot water circulation pump |
D.22 | Hot water demand |
D.23 | Summer/Winter function |
D.25 | Hot water activation via ebus control |
D.30 | Control signal for both gas valves |
D.33 | Fan speed target value |
D.34 | Fan speed actual value |
D.36 | Hot water flow sensor |
D.40 | Flow temperature target value |
D.41 | Return temperature actual value |
D.44 | Digitised ionisation potential error |
D.47 | Outside temperature with weather compensator – Vaillant controller only |
D.76 | Remaining burner anti-cycling time in min |
D.90 | Digital regulator status |
D.91 | DCF status with connected external probe |
D.97 | Activation of the second diagnostic level |
D.17 | Heating glow return regulation |
D.18 | Pump mode return |
D.19 | Operating modes of the two speed heating pump |
D.20 | Maximum set value for target cylinder |
D.27 | Switching accessory relay 1 |
D.28 | Switching accessory relay 2 |
.50 | Offset for minimum speed |
D.51 | Offset for maximum speed |
D.58 | Activation of solar reheating |
D.60 | Number of safety temperature cut off |
D.61 | Number of unsuccessful lockouts |
D.64 | Average ignition times |
D.65 | Maximum ignition time |
D.68 | Unsuccessful ignitions in the first attempt |
D.69 | Unsuccessful ignition for the second time |
D.70 | Set diverter valve position |
D.71 | Maximum setting of heater control knob |
D.72 | Pump overrun time after warm start |
D.73 | Off set for warm start target value |
D.75 | Maximum charging time for a storage without own controller |
D.77 | Limitation of cylinder charging in output in kW |
D.78 | Limitation of cylinder charging temperature in c |
D.80 | Operating hours heating |
D.81 | Operating hours hot water generation |
D.82 | Burner start up in heating mode |
D.83 | Burner start up in hot water mode |
D.84 | Maintenance indicator – number of hours until the next maintenance |
D.93 | DSN appliance variant setting |
D.96 | Factory setting |
The Vaillant EcoTEC Plus is an intelligent boiler. It provides more benefits than a standard boiler, like advanced diagnostics, and highly efficient combustion. However, as with all advanced technologies, there are some problems that can develop.
The EcoTEC Plus Gas boiler error codes will help you diagnose the problem by letting you know what's going on inside your boiler. That way, when you're troubleshooting, you'll have a better idea of what might be causing your system to give error signals.
Below is a full list of the most commonly-encountered EcoTEC Plus Gas boiler error codes, their meanings, and action required.
Fault Code | Possible Cause |
---|---|
P.00 | The heating circuit and hot water circuit are purged |
P.01 | Maximum load test program error |
P.02 | Minimum load test program |
P.06 | Filling mode test program |
The Vaillant EcoTEC Boilers are considered by many to be the best make of gas boiler on the market. But, just like any other piece of technology, they can and will occasionally fail. The problem with gas boilers is that little or nothing is relayed to the homeowner as to what the fault actually is. Meaning that a plethora of different error codes might be displayed in a short period of time, causing great confusion.
If you have an EcoTEC gas boiler, you should know how to read its error codes. Your heating system's error codes will tell you about malfunctions in the different parts of your boiler, allowing you to fix them and improve its efficiency.
Here's a list of the most common boiler error codes you might see on an EcoTEC Gas Boiler. These examples are based in the UK, but logic is fairly consistent across other countries, and this should hopefully be helpful regardless of where you're located.
Fault Code | Possible Cause |
---|---|
D.0 | Heating part load error |
D.1 | Water pump overrun – time for heat mode |
D.2 | Max burner anti-cycling period at 20c flow temperature |
D.3 | Hot water flow temperature reading |
D.4 | Current temperature for warm stat sensor |
D.5 | Set value of flow temperature or target value of return |
D.7 | Warm start temperature target value |
D.8 | External controls heat demand |
D.9 | Flow target temperature from external analogue regulator terminal |
D.10 | Status internal heating pump error |
D.11 | Status external heating pump error |
D.12 | Cylinder charging pump via accessory module |
D.13 | Hot water circulation pump |
D.15 | Pump speed actual value |
D.22 | Hot water demand |
D.23 | Summer/Winter function |
D.24 | Not relevant |
D.25 | Hot water activation via eBus control |
D.30 | Control signal for both gas valves |
D.33 | Fan speed target value |
D.34 | Fan speed actual value |
D.35 | Not relevant |
D.40 | Flow temperature target value |
D.41 | Return temperature actual value |
D.44 | Digitised ionisation – potential error |
D.47 | Outside temperature with weather compensator – Vaillant controller only |
D.76 | Remaining burner anti-cycling time in min |
D.90 | Digital regulator status |
D.91 | DCF status with connected external probe |
D.97 | Activation of the second diagnostic level |
D.98 | Telephone a heating engineer |
D.14 | Pump speed target value |
D.17 | Heating flow return regulation |
D.18 | Pump operating mode |
D.20 | Maximum set value for target cylinder |
D.26 | Additional relay control ecoTec |
D.27 | Switching accessory relay 1 |
D.28 | Switching accessory relay 2 |
D.50 | Offset for minimum speed |
D.51 | Offset for maximum speed |
D.60 | Number of safety temperature cut offs |
D.61 | Number of unsuccessful lockouts |
D.64 | Average ignition times |
D.65 | Maximum ignition time |
D.67 | Remaining burner anti-cycling time |
D.68 | Unsuccessful ignitions in the first attempt |
D.69 | Unsuccessful ignition for the second time |
D.70 | Set diverter valve position |
D.71 | Maximum setting of heater control knob |
D.72 | Pump overrun time after warm start |
D.75 | Maximum charging time for a storage without own controller |
D.77 | Limitation of cylinder charging in output in kW |
D.78 | Limitation of cylinder charging temperature in celsius |
D.80 | Operating hours heating |
D.81 | Operating hours hot water generation |
D.82 | Burner start up in heating mode |
D.83 | Burner start up in hot water mode |
D.84 | Maintenance indicator – number of hours until the next maintenance |
D.93 | DSN appliance variant setting |
D.96 | Factory setting |
There are numerous reasons why your Vaillant EcoMax Pro 18/28E boiler could display a boiler error code. These include problems with the power supply, the heating controls, or a fault with your home's water pressure.
Here's a handy table to help you understand the possible error codes. If you do find yourself with an error code on your 18/28E boiler, at least now you'll have some idea of what it means, and be able to take corrective action.
Fault Code | Possible Cause |
---|---|
F.1 | Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead. |
F.4 | Ignition fault. |
F.5 | The system has suffered a fault due to overheating. |
F.6 | Your flow NTC has developed a fault. |
F.17 | Check the polarity of your system. |
F.24 | Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock |
Here are the most common fault error codes you're likely to see, along with explanations for what they mean. Combining this information with the user-friendly ecomax pro 828e boiler manual will give you the knowledge you need to arrange repairs to your home's heating system.
Vaillant Ecomax Pro 828E error codes can be classified in two main types: the boiler display and the control board. Both of them are discussed here.
Fault Code | Possible Cause |
---|---|
F.00 | NTC Faults |
F.04 | NTC Faults |
F.05 | NTC Faults |
F.10 | NTC Faults |
F.14 | NTC Faults |
F.15 | NTC Faults |
F.21 | The pilot flame has failed. |
F.22 | There is insufficient water in your system. |
F.11 | A blockage in the appliance is preventing the system from flowing as it should. |
F.12 | A blockage in the appliance is affecting the system’s pressure. |
F.13 | The appliance is blocked because of a water deficiency. |
The Vaillant Turbomax Plus 824/828E Boiler Error Codes are displayed in the form of digital messages. If an error is recognized, flashing panels will appear at the top left corner on the front of your boiler. A sound buzzer may also sound to alert you that an error has been detected. This table helps you understand what these codes mean and what actions to take when it is displayed on your machine's operating panel.
Fault Code | Possible Cause |
---|---|
F.00 | NTC Faults |
F.01 | NTC Faults |
F.10 | NTC Faults |
F.11 | NTC Faults |
F.13 | NTC Faults |
F.20 | Boiler has exceeded the maximum temperature and needs to cool down |
F.22 | Dry fire / Low water in system / Overheat |
F.24 | Low water / Pump Failure / Blockage |
F.28 | Either insufficient gas in the system, a defective electrode, ignition lead or electronic ignitor |
F.29 | Flame extinguished |
F.60 | Gas valve control defective |
F.61 | Gas valve control defective |
F.62 | Defective gas valve closure mechanism |
F.63 | EEPROM (Electrically Erasable Programmable Read-Only Memory) error |
F.64 | Electronic system or sensor fault |
F.65 | Electronic system temperature too high |
F.67 | Electronic fault in the flame system |
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