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Vaillant EcoTec Pro & Plus Fault Codes
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Welcome to W.B Plumbing & Heating. We are qualified in all aspects of Plumbing and Heating Maintenance and Services.

Fault finding codes for the Vaillant EcoTec Pro & Plus range

Codes          Description

F. 0             Flow–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective
                   connection at electronics
F. 1             Return–NTC open circuit NTC broken, NTC cable broken, Defective connection at NTC, Defective
                   connection at electronics
F.10            Flow NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.11            Return NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.13            Tank NTC short circuit NTC defective, short circuit in cable harness, cable/casing shortcut
F.20            Safety temperature limiter by NTC activated Flow-NTC not correctly thermal-connected or defective;
                   appliance does not shut down
F.22            Dry fire Too little water in the appliance, water pressure sensor defective, cable to pump or water
                   sensor defective, pump blocked or defective, pump output too low
F.23            Water shortage, temperature difference between flow and return NTC too large Pump blocked or
                   defective, pump output too low, flow and return NTC interchanged
F.24            Water shortage, temperature rise too quick Pump blocked, insufficient pump output, air in appliance,
                   water pressure too low
F.25            Interruption in the compact thermal module cable harness Compact thermal module cable harness
                   defective
F.27            Incorrect sensing of flame Flame detector defective
F.28            Appliance does not start: Attempts to ignite during start failed. Faults in the gas supply such as:
                   - Gas meter or gas pressure detector defective
                   - Air in gas
                   - Gas flow pressure too low
                   - Fire protection tap has disengaged
                   Faults in the gas valve, wrong gas setting, igniter (ignition transformer, ignition cable, ignition plug)
                  defective, ionisation current stopped (cable, electrode), faulty earthing in appliance, electronics
                  defective
F.29           Flame goes off during operation and subsequent ignition attempts failed Gas supply temporarily
                  stopped, faulty earthing of appliance
F.32           Fan speed variation Fan blocked, plug not inserted correctly on fan, hall sensor defective, fault in cable
                  harness, electronics defective
F.49           eBUS undervoltage Short circuit on eBUS, overload on eBUS or two power sources on eBUS with
                  different polarity
F.61           Gas–valve control defective Short circuit/earth (ground) leak in cable harness to gas valves, gas valve
                  assembly defective (earth/ground leak from coils), electronic control system defective
F.62           Gas valve shutoff delay Gas valve leaking, electronics defective
F.63           EEPROM error Electronics defective
F.64           Electronics/NTC fault Short-circuit in flow or return NTC or electronics defective
F.65           Electronics temperature too high Electronics too hot due to external effect, electronics defective
F.67           Flame detector input signal is outside the limits (0 or 5 V) Electronics defective
F.70           No valid DSN in display and/or mainboard Spare part failure display and maiboard interchanged at same
                  time and device specific number not adjusted
F.71           Flow NTC reports constant value (stuck at) Flow NTC is defective
F.72           Flow and/or return NTC fault Flow and/or return NTC is defective (tolerances too big)
F.73           Water pressure sensor signal out of range (too low) Cable to water pressure sensor is broken or has a
                  short-circuit at 0 V or water pressure sensor defective
F.74           Water pressure sensor signal out of range (too high) Cable to water pressure sensor has a short-circuit
                  at 5 V / 24 V or internal fault in water pressure sensor
F.75           No pressure rise was detected on turning on the pump Water pressure sensor or/and pump defective.
                  Air in the heating system, quick bleeder defective
                  Too little water in appliance; check adjustable by-pass; connect external expension vessel to return
F.76          Overheating protection on primary heat exchanger triggered Cable or cable connection of fuse in the
                 primary heat exchanger defective, or primary heat exchanger defective
F.77          Condensate pump or feedback of accessorie blocks heating condensate pump defective or flume flap
                 feedback triggered
F.78          Wrong configuration with accessory link box VR65 connected to combination boiler con no
                 communication to mainboard connection error display mainboard

IF YOU HAVE A FAULT CODE SHOWING UP ON YOUR VAILLANT BOILER PLEASE DONT HESITATE TO GIVE US A CALL AND WE WILL FIX IT AT A FRACTION OF THE PRICE BRITISH GAS AND OTHER COMPANIES WILL CHARGE YOU!
Why Choose Us?

All projects, no matter how BIG or small, are managed and carried out by our experienced staff and long serving, fully qualified tradesmen. Our Gas and Heating engineers are 'GAS SAFE' registered and our other trades are NVQ2 (and above) certified. We know that your home or office is important to you and that makes it important to us too. Our tradesmen make a point of ensuring that their workspace is always kept clean and tidy and are trained to conform to Health & Safety guidelines at all times.

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Boiler Fault Codes