Error code

Vaillant All models code 28

For your safety

This fault is rated critical. No remote repair or do-it-yourself instructions are given; do not use the appliance or try to open or repair it.

Hazard area: gas/flue and mains voltage

If you smell gas:

Do not touch any electrical switch, do not turn lights on or off, and do not use your phone indoors. If possible, close the gas valve, open the windows and leave the building. Call once you are outside.

Call 187

The emergency numbers here are for Turkey. If you are outside Turkey, call your local emergency number.

All emergency numbers and province details

No approved translation for this record yet; showing the original text.

Meaning

Failure during start-up: ignition unsuccessful

Member details

Signed-in members see the LED pattern and how to read the code with the remote control on eligible records.

View details as a member

Possible causes

gas meter defective, gas pressure monitor has been triggered, air in gas, gas flow pressure too low, Thermal isolator device (TAE) has been triggered, condensate duct blocked, incorrect gas throttle, error at gas valve, multiple plug on electronics incorrectly plugged in, break in cable harness, ignition system (ignition transformer, ignition cable, ignition plug, ignition electrode) defective, ionisation current interrupted (cable, electrode), incorrect earthing of boiler, electronics defective

Solution

Solution steps are not shared for faults that may be dangerous.

No do-it-yourself solution is given for this fault. For your safety, call an authorised service.