Remeha Avanta 28c Fault codes & diagnostics

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

Combi Natural Gas 24 kW 2005 onwards Discontinued
GC Number 47-673-03

Replaced by: Avanta Ace

Download the Remeha Avanta 28c 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 →

Severity at a glance

Each cell = one fault code. Hover to identify.
6 High 1 Medium 4 Low
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
47-673-03 Avanta Plus 35c 2005–present
Just want the most common Remeha Avanta 28c faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 11 documented codes

Tap any card for details

é0

Your boiler is perfectly healthy and is simply resting in its normal standby state, waiting for a signal to provide heating or hot water.

Low DIY-safe

What to check first

  1. Check that your room thermostat or programmer is set to a temperature higher than the current room temperature
  2. Ensure your hot water tap is turned on fully if you are testing for hot water

Related codes

Full explanation for é0
é1

Your boiler is currently performing a necessary safety check before it attempts to ignite, but it has stalled at this initial stage.

High Engineer only £120-250

Parts commonly replaced

  • Fan
  • Air pressure switch
  • Printed Circuit Board (PCB)

Related codes

Full explanation for é1
E2

Your boiler has detected that it is not heating the water effectively, often caused by trapped air in the system or a temporary lockout that requires a reset.

High Engineer only £120-250

Parts commonly replaced

  • Air pressure switch
  • Circulation pump
  • NTC sensor

Related codes

Full explanation for E2
é2

Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.

High Engineer only £150-300

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

Full explanation for é2
E3

Your boiler has detected an internal electrical fault with a temperature sensor, which has caused it to shut down for safety reasons.

High Engineer only £120-220

Parts commonly replaced

  • Return temperature sensor (S2)
  • Wiring harness

Related codes

Full explanation for E3
é4

Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a build-up of unburnt gas.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Ignition transformer

Related codes

Full explanation for é4
é6

Your boiler is continuing to circulate water even though it should have finished, which suggests the system is struggling to reset after heating your home or water.

Low Engineer only £120-250

Parts commonly replaced

  • Pump
  • PCB

Related codes

Full explanation for é6
é7

Your boiler has detected that the water pressure inside the system is far too low to function safely.

High DIY-safe £80-150

What to check first

  1. Locate the filling loop (usually two silver taps connected by a braided hose) underneath the boiler.
  2. Gradually open the taps to let mains water into the heating system until the pressure gauge reads between 1.0 and 1.5 bar.
  3. Close both taps tightly and check the display to see if the error has cleared.

Parts commonly replaced

  • Pressure relief valve
  • Filling loop
  • System pressure sensor

Related codes

Full explanation for é7
OT ERROR

Your boiler's external temperature sensor and frost protection thermostat are sending conflicting signals to your heating controller.

Medium Engineer only £120-200

Parts commonly replaced

  • Outside temperature sensor
  • Frost thermostat
  • Wiring harness

Related codes

Full explanation for OT ERROR