BoilerFaultCodes Connection
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Vaillant ecoFIT pure 630 Fault codes & diagnostics
41 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
System Gas 2016-present
GC Number 41-694-07
Download the Vaillant ecoFIT pure 630 manual
PDF
Versions & GC numbers
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Severity at a glance
Each cell = one fault code. Hover to identify. 41 Unrated
Which version do you have?
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-694-07 | ecoFIT pure 630 VU 306/6-3 (H-GB) | 2016–present |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Just want the most common Vaillant ecoFIT pure 630 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 41 documented codes
Tap any card for details
F.00
Fault: Flow temperature sensor
F.01
Fault: Return temperature sensor
F.10
Short circuit: Flow temperature sensor
F.11
Short circuit: Return temperature sensor
F.12
Short circuit: Cylinder temperature sensor
F.13
Short circuit: Domestic hot water cylinder temperature sensor
F.20
Safety switch-off: Overheating temperature reached
F.22
System water pressure too low (switches off the product)
F.23
Safety switch-off: Temperature difference too great (NTC1/NTC2)
Showing 11–20 of 41
F.24
Safety switch-off: Temperature rise too fast
F.25
Safety switch-off: Flue gas temperature too high
F.27
Safety switch-off: Fault in flame detection
F.28
Fault: Ignition unsuccessful when starting up
F.29
Fault: Flame loss
F.32
Fan frost protection function active: Fan speed outside the tolerance values
F.49
eBUS fault: Voltage too low
F.61
Fault: Gas valve control system
F.62
Fault: Gas valve switch-off control
F.63
Fault: EEPROM
Showing 21–30 of 41
F.64
Fault: Electronics/sensor/analogue-to-digital converter
F.65
Fault: Electronics temperature too high
F.67
Values sent back by ASIC is incorrect (flame signal)
F.68
Fault:Unstableflame(analogueinput)
F.70
Invalidproductcode(DSN)
F.71
Fault:Flow/returntemperaturesensor
F.72
Fault:Deviationinthewaterpressuresensor/returntemperaturesensor
F.73
Fault:Waterpressuresensornotconnectedorhasshort-circuited
F.74
Fault:Electricalprobleminthewaterpressuresensor
F.75
Fault:Pressuresensor
Showing 31–40 of 41
F.76
Thesafetycut-outintheprimaryheatexchangerisdefective
F.77
Fault:Condensateorsmoke
F.78
InterruptiontoDHWoutletsensoratexternalcontroller
F.83
Fault:Dryfire
F.84
Fault:Flow/returntemperaturesensor
F.85
Fault:Temperaturesensor
F.86
Fault:Underfloorheatingcontact
F.87
Fault:Electrodes
F.88
Fault:Gasvalve
F.89
Fault:Pump
Showing 41–41 of 41
F.91
Short circuit: Cylinder temperature sensor
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