Vokera Easi-Heat Plus Fault codes & diagnostics

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

CombiSystem Natural Gas 25-32 kW 2016 onwards
GC Numbers 41-364-0341-364-0447-364-2947-364-3047-364-3347-364-34
Download the Vokera Easi-Heat Plus 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
47-364-29 Easi-Heat Plus 25C 2016–present
47-364-30 Easi-Heat Plus 29C 2016–present
Just want the most common Vokera Easi-Heat Plus 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 dangerously overheating and has automatically shut itself down to prevent damage.

High Engineer only £150-300

Parts commonly replaced

  • High limit thermostat
  • Pump
  • Diverter valve
  • PCB
Full explanation for Alarm high limit thermostat
Alarm system water pressure

Your boiler has detected that the water pressure inside your heating system is too low to operate correctly.

High DIY-safe £80-150

What to check first

  1. Locate the filling loop (a flexible silver hose) underneath the boiler
  2. Slowly turn the small valve(s) to allow mains water into the system
  3. Monitor the pressure gauge until the needle is between 1.0 and 1.5 bar
  4. Close the valve(s) tightly to stop the flow

Parts commonly replaced

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

Your boiler's temperature sensors are giving conflicting or invalid readings, so it has stopped working to prevent potential damage.

High Engineer only £120-200

Parts commonly replaced

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

Your boiler has detected a brief hiccup in its internal systems and is pausing operation to protect itself.

Low DIY-safe

What to check first

  1. Locate the reset button or dial on the front of the boiler display panel
  2. Press and hold the reset button for 3 to 5 seconds
  3. Wait a few minutes to see if the boiler resumes normal operation
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 working exactly as it should, waiting for a signal from your thermostat or hot water tap to start heating. Flame ON Status Your boiler's electronic control system is incorrectly detecting a flame inside the unit even when it should be turned off, which is a safety concern that prevents it from starting up correctly. Purge cycle mode active Status Your boiler is currently performing an automatic air-removal process to clear trapped air from the system and is not actually broken. Service operation Diagnostic Your boiler has reached its programmed time for a routine annual safety inspection and professional service.
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