Error codes of Vaillant gas boilers
Error code
Explanation of the error code
Possible causes of the malfunction
F.00
Open circuit in the NTC feed sensor
Malfunction of NTC sensor, cable or connector
F.01
Open in the NTC sensor circuit
Malfunction of NTC sensor, cable or connector
F.02
Opening the NTC sensor of the filling temperature of the drive (VSC)
The NTC connector is not inserted or inserted loose, the NTC sensor is defective, or the connection to the case is not inserted securely / not inserted, the cable
F.03
Opening NTC Drive Sensor (VSC)
The NTC sensor is defective, the plug is not inserted securely / not inserted, the cable
F.04
Open in the NTC sensor circuit
Malfunction of sensor, cable or connector
F.05
(Only Vaillant Atmo)
An open in the chain of the external boiler draft sensor
Malfunction of sensor, cable or connector
F.06
(Only Vaillant Atmo)
Break in the chain of the internal traction sensor
Malfunction of sensor, cable or connector
F.10
Short circuit of the NTC sensor (greater than 130 ° C)
Malfunction of sensor, cable or connector
F.11
Short circuit of the NTC sensor return (more than 130 ° C)
Malfunction of sensor, cable or connector
F.12
Short circuit - NTC filling of the drive (> 130 ° C) (VSC)
The NTC connector is defective, an unacceptable
NTC contacts or on electronics, NTC defective, defective cable
F.13
Hot start sensor short circuit
Closure of the sensor plug to ground, short in the cable harness, defective sensor; Temperature> 130 ° C.
F.14
Short circuit of the NTC sensor return (more than 130 ° C)
Malfunction of sensor, cable or connector
F.15
(Only Vaillant Atmo)
Short-circuit of external traction sensor
Malfunction of sensor, cable or connector
F.20
Actuation of the STB sensor
• sensor - NTC faulty or improperly connected
• the device does not turn off
F.22
"Dry running"
- very little water in the device,
- malfunction in the cable suitable for the pump
- the pump has jammed or malfunctioned
- weak water circulation
- NTC sensor defective
- the electronic card is faulty
F.23
Lack of water in the system.
It is recognized by comparing the water temperature on the return and supply
- too little water in the device
- cable to the pump
- The pump is defective or blocked
- weak circulation - NTC sensor defective
- the electronics board is damaged
F.24
Lack of water in the system - very high temperature on the supply
• Too little water in the appliance
• malfunction in the cable suitable for the pump
• the pump is jammed or defective
• weak water circulation
F.25
Disabling Security Devices:
Exhaust gas temperature too high
Plug connection, optional thermal overturn protection
(STB) is interrupted, the cable harness breaks
F.26
The lack of proper current for the stepper motor of the gas valve
F.27
"Extraneous flame" ionization signal indicates the presence of a flame with a closed gas valve
• extraneous flame, malfunction of gas solenoid valve
• malfunction in the operation of flame detection (replace the electronic board)
F.28
"Device ignition lock"
Unsuccessful ignition attempts, the unit does not start
- a fault in the gas supply, for example:
- gas meter or gas pressure reducer is defective
- presence of air in gas
- too little gas flow
- the gas cock is closed
• malfunction of the gas fittings (malfunction of the main gas magnet or operator)
• incorrect connection to the gas pipeline (too little gas for ignition)
• fault in the ignition transformer
• rupture in ionization current (cable, electrode)
F.29
"Failure in the operating mode" Flame extinguished during operation, ignition attempts failed
• gas supply from the gas pipeline was temporarily stopped
• failure of the ignition transformer
• flue gas recirculation
• An error in connecting the ground to the device
F.30
Breakage of the stylus of the boiler (ecoCRAFT / 3)
F.31
Short circuit of the boiler probe (ecoCRAFT / 3)
F.32
Fan speed deviation (condensing only)
The fan is blocked, the plug is incorrectly inserted into the fan, the Hall sensor is faulty, the cable harness is faulty, the electronics are faulty
F.33
30 minutes after the heat request, the gas-air pressure switch does not close the contact.
Only for Vaillant turboTEC
No signal from the gas-air pressure switch. The gas-air pressure switch does not open the contact after the fan is turned off
F.34
The manostat does not turn off when the fan stops
F.35
Error in air / gas pipe
Air line / gas outlet closed
F.36
(Only in Vaillant Atmo)
The flue gas sensor detected the flow of waste gases into the room
• insufficient external conditions for starting the device
• short exhaust gas pipe
• insufficient air flow
• The installation temperature of the system is too high
• insufficient indentation of the device from the walls in the place of its installation
F.37
Fan speed deviation (too high or too low speed during operation)
The pressure sensor is not inserted or defective (but not short-circuit or open)
F.42
Short-circuit coding resistor
Short circuit on the encoded resistance in the bus
F.43
Coding resistor breakage
Breakage in the chain of coding resistance
F.49
Undervoltage detection on the eBus bus
Short circuit in the eBus bus, eBus overload or on the eBus 2 bus of a voltage source with different polarity
F.55
CO Sensor Error
Cable trunk error:
- CO sensor plug is not inserted or inserted weakly
- Open / short in cable trunk
- CO sensor is defective.
F.56
Exceeded combustion limit value
CO emission values are greater than the limit values (more than 60 seconds)
F.57
The diagnosis itself is unsuccessful
Exhaust gas recirculation, blocked / clogged exhaust gas system, too low gas pressure, blocked / clogged fresh air path, the fan speed fluctuates, the unit is tuned to the wrong kind of gas
F.60
Gas valve - error 1
Electronic fault, the panel light does not light up
F.61
Gas valve - error 2
Electronic fault, the panel light does not light up
F.62
Gas valve - tripping delay fault
Presence of flame for more than 4 seconds after shutting off the gas valve
• electronic failure
• clogging of injectors or gas collector
• malfunction of the gas valve
F.63
EEPROM error
Checksum error
• electronic failure
• EMV fault
F.64
ADC error
• malfunction of sensors (feed, return, exhaust gases, incomprehensible coding of the device)
• electronic failure
F.65
ASIC-blocking when the electronic unit is too hot
• The temperature in the switching unit is too high
• The temperature in the room where the system is installed is too high
• electronic failure
F.66
I? C-Bus communication error
• Display malfunction
• malfunction of the cable that fits the display
• electronic failure
F.67
GFA error
Check for flame on the burner (different readings for microprocessor and ASIC)
• electronic failure
• malfunction of the ionization electrode or a suitable wire
F.70
Invalid boiler execution number for display and / or electronics
At the same time, the display and electronics were replaced, and the number
The boiler is not re-introduced
F.71
The flow sensor reading does not change
The sensor on the supply line is faulty
F.72
Incorrect feed and / or return sensor reading
Malfunction of the flow and / or return sensor
F.73
Invalid water pressure sensor signal (too low)
Breakage of water pressure sensor or short circuit to 0 V or
Water pressure sensor is faulty
F.74
Wrong water pressure sensor signal (too high). Pressure> 4.5 bar.
Short circuit of the water pressure sensor by 5 V / 24 V or
Internal water pressure sensor error
F.75
After a 5-fold start of the pump, a pressure increase of> 50 mbar
The change in pressure is not detected when the pump is switched on:
The water pressure sensor or / and the pump, the air in the heating system, the low water pressure in the boiler, the expansion tank is connected to the supply line
F.76
The overheating protection device on the primary heat exchanger has tripped
The cable or fuse connections in the primary heat exchanger are damaged or the primary heat exchanger is defective
F.77
Maximum level reached
Water in the condensate drain pump / there is no feedback from the module 2 of 7
The condensate drain pump is faulty or the feedback signal is received
From the flue gas valve (only possible when combined with these accessories)
F.78
Invalid configuration with membership
Incorrect electrical connection with accessory
F.82
An error of the device for testing an anode fed from an extraneous source
If the anode is not connected, which is supplied from an external source, the edge plug is not inserted / misplaced in the PCB in the junction box; With an anode connected to the external source, the anode is defective, the anode contacts or the electronics have an invalid electrical connection, the cable
E11
Locking
The connection of the NTC sensors of the supply and return lines
E12
Locking
150 sec .: T1-T2> 35K
E13
Locking
10 min: (dT1 / dt)> 4K / s
Bug in software