Vokera Vibe 20A / 25A Fault codes & diagnostics

4 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

System Natural Gas 20-25 kW 2014 onwards
GC Numbers 41-094-4741-094-8441-094-85
Download the Vokera Vibe 20A / 25A manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Versions & GC numbers

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
41-094-84 Vibe 20A 2014–present
41-094-85 Vibe 25A 2014–present
Just want the most common Vokera Vibe 20A / 25A faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 4 documented codes

Tap any card for details

Alarm high limit thermostat

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage.

High Engineer only £120-250

Parts commonly replaced

  • Limit Thermostat
  • Pump
  • PCB
  • Diverter Valve
Full explanation for Alarm high limit thermostat
Alarm system water pressure

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.

High DIY-safe £80-120

What to check first

  1. Locate the internal filling loop beneath the boiler.
  2. Open the valves slowly to top up the pressure until the gauge reads between 1 and 1.5 bar.
  3. Close the valves tightly and press the reset button on the interface.

Parts commonly replaced

  • Filling loop
  • Pressure relief valve
  • Pressure sensor
Full explanation for Alarm system water pressure
Fault sensors

Your boiler's safety sensors have detected an issue, causing it to shut down to prevent potential damage.

High Engineer only £120-220

Parts commonly replaced

  • NTC sensor
  • Wiring harness
  • Main PCB
Full explanation for Fault sensors
Temporary fault

Your boiler has detected a brief hiccup in its internal communication, but it is currently resetting itself to get back to normal operation.

Low DIY-safe

What to check first

  1. Wait five minutes to see if the error clears automatically
  2. Turn the boiler mode selector to 'Reset' for 10 seconds
  3. Turn the selector back to your preferred setting
Full explanation for Temporary fault
Status & diagnostic codes

4 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

Boiler stand-by Status Your boiler is currently in standby mode and is simply waiting for a signal from your thermostat or hot water tap to start heating. Flame ON Status Your boiler is signalling that the burner is currently lit and operating exactly as it should. Purge cycle mode active Status Your boiler is currently running its automatic air-clearing process and should start heating normally once this sequence finishes. Service operation Diagnostic Your boiler has reached its programmed time limit and is simply reminding you that it is due for its annual safety check and performance service.
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