Valient Ecotec Pro 28 Fault Codes

As a resident of the UK, you will be no doubt already aware that we are on the very doorstep of winter. Unfortunately, this can mean a whole host of extra costs and additions to your home just trying to stay warm. More heating bills, extra layers of clothing and housing changes like insulation are all common parts of the winter procedure for houses up and down the country.

One problem that many houses suffer with is their boiler, though. Even an efficient boiler that comes from a well-recognized brand like the Valient Ecotec Pro 28 struggles for some people and with boiler breakdowns up 60% in the winter months you can never be too careful. Despite being a great boiler, it does have some very specific issues that can crop up and give you a good few hours’ worth of headaches along the way.

If you don’t want to spend your time and money running around trying to get emergency help for a problem you may be able to sort yourself, then use our Master List of Valient Ecotec Pro 28 codes to see what the issue is.

These systems come hardwired with typical fault codes in them so that you can easily find the solution to the problem and correct it yourself or, if it’s beyond your level of capability, phone an expert to deal with the problem for you. So, if you are sick of looking at your Valient Ecotec Pro 28 and wondering just what is going with it, and when you can heat up the house properly again, these codes should help you fully understand what is happening;


The Fault Codes


  • 00 – Flow Temperature Sensor interruption – Usually this means that the NTC plug has come loose, or it’s damaged in some way
  • 01 – Return Temperature Sensor interruption – Usually this means that the NTC plug has come unstock or has been severely damaged, or that the NTC is damaged
  • 10 – Flow NTC short circuit – Typically implies that the NTC is damaged, or that there is a short circuit in the cable harness
  • 11 – Return NTC short circuit – Usually means that the NTC has been compromised, or that a short circuit has occurred in the cable harness
  • 20 – Safety Switch off temperature limiter – Usually means there is an incorrect “Earth” connection between the cable harness and the boiler
  • 22 – Safety Switch off low water pressure – There will be no water pressure, or the pressure is too low in the boiler – additionally, it could be a damaged sensor
  • 23 – Safety Switch off with high temperature rise – Usually means that the bump has become blocked, or there is a poor output from the pump. Could also mean air in the boiler
  • 24 – Safety Switch off fast temperature rise – Usually implies a break in the plug connection, or a break in the cable harness
  • 25 – Safety Switch off flue gas temperature risen – The pump could be blocked or not performing to it’s capacity, or there could be a break in the cable harness
  • 26 – Gas Valve with no function – Usually implies that the gas stepper motor has become disconnected or there is an interruption in the cable harness
  • 27 – Safety Switch off flame simulations – Points to moisture on electronics, or a damaged flames sensor, or a leaking gas valve
  • 28 – Failure to startup, unsuccessful ignition – Defective gas meter or the gas pressure regulator has been triggered. Could also be that air has got into the gas supply, or the gas pressure is too low
  • 29 – Failure to startup, failed ignition – The could supply cold have dropped, there could be a condensate duct blocked or there is a faulty earthing in the boiler
  • 32 0 Fan Fault – The plug could not be inserted properly, or there could be a snap in the cable harness
  • 49 – eBUs Fault – Short circuit on the eBUS, or an overload of the two power supplies within the eBUS
  • 61 – Gas valve regulation – Usually defective electrics or damaged gas valve, but it could be a short-circuit to the earth in a cable harness
  • 62 – Gas valve switch-off delay – Could be a delayed shutdown of the gas valve, a leaking gas valve or defective electrics
  • 63 – EEPROM – This can only be caused by defective electrics
  • 64 – NTC Fault – Caused by damage to the supply and return of the NTC or defective electrics
  • 65 – Electronics temperature fault – Usually caused by overheating due to other influences or defective electronics
  • 67 – Flame Fault – A damaged flame signal, or faulty electronics
  • 68 – Unstable flame signal – There usually could be air in the gas, or too low a flow pressure
  • 70 – Invalid DSN (Device Specific Number) – The display and PCB were changed at the same time, and the appliance code needs reset
  • 71 – Flow NTC Fault – A problem with the flow temperature sensor or a defective sensor
  • 72 – Flow/Return NTC Fault – Flow/return NTC temperature difference which is too high, or the sensor could be damaged
  • 73 – Water pressure sensor signal too low – Short-circuit to the water pressure sensor, or damage to the supply line to the water pressure
  • 74 – Water pressure sensor signal too high – The cable to the water pressure may be damaged, or there is damage inside with the pressure sensor
  • 75 – No pressure change detection – Usually damage to the pump or the water pressure sensor, or there is air in the heating installation
  • 76 – Overheating protection responding – Usually means that the safety fuse cables have become damaged and need replaced
  • 77 – Flue non-return flap/condensate pump damage – When there is no response from the flap, could be caused by defective condensate pump
  • 78 – DWH Outlet Sensor fault – Usually means that the UK link box is connected, but there is no bridge between the NTC and the hot water
  • 83 – Return temperature sensor change fault – When the burner begins, the temperature registered may be non-existent or undervalued. Usually caused by a lack of water in the boiler
  • 84 – Implausible temperature difference with flow/return sensor – Usually caused by an inversion of the flow and return sensors, or that they been wrongly fitted
  • 85 – Incorrect fitting of Fault: Flow and return sensors – Sensors have been fitted to the same pipe or the wrong pipes

If you struggle with operating or understanding anything that your system tells you, then contact us HERE for more information!