Remeha Avanta Plus 35c Fault codes & diagnostics

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

Combi Natural Gas 35 kW 2007-2016 Discontinued

Replaced by: Remeha Avanta Ace

Download the Remeha Avanta Plus 35c 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 →

Just want the most common Remeha Avanta Plus 35c faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 5 documented codes

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é0

Your boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately monitor the water temperature and has shut down as a safety precaution.

High Engineer only £120-£220

Parts commonly replaced

  • Flow temperature NTC sensor
  • Return temperature NTC sensor
  • Wiring harness

Related codes

Full explanation for é0
e1

Your boiler is struggling to ignite or detect a flame, causing the system to stop as a safety precaution.

High DIY-safe £100-£350

What to check first

  1. Check that your gas meter is turned on and other gas appliances like the hob are working.
  2. If you have a prepaid gas meter, verify that you have sufficient credit.
  3. Press and hold the 'Reset' button for two seconds and wait up to three minutes for the venting cycle to complete.

Parts commonly replaced

  • Ignition electrode
  • Flame sensing probe
  • Gas valve

Related codes

Full explanation for e1
é1

Your boiler has detected that the water inside is getting too hot too quickly, usually because there isn't enough water pressure or the water isn't moving through the pipes properly.

High DIY-safe £100-£280

What to check first

  1. Check the pressure gauge on the front of the boiler; if it is below 1.0, top it up using the filling loop.
  2. Ensure all radiator valves are fully open to allow water to circulate.
  3. Bleed your radiators to remove any trapped air that might be blocking the flow.

Parts commonly replaced

  • Circulation pump
  • Flow/Return temperature sensor (NTC)
  • Main heat exchanger (flushing)

Related codes

Full explanation for é1
é2

Your boiler has detected that water is not circulating correctly, often because there is trapped air or the system pressure is too low.

High DIY-safe £100-280

What to check first

  1. Check the pressure gauge and top up to 1.5 bar if it is low
  2. Bleed all radiators to remove trapped air
  3. Ensure all radiator valves and isolation valves are fully open
  4. Reset the boiler using the reset button

Parts commonly replaced

  • Flow/Return temperature sensors
  • Circulation pump
  • Automatic air vent

Related codes

Full explanation for é2
e45

Your boiler's internal computer has suffered a software failure and can no longer process the settings needed to operate safely.

High Engineer only £280-450

Parts commonly replaced

  • Main PCB (Control Board)
  • Display PCB

Related codes

Full explanation for e45
Status & diagnostic codes

2 operating states & engineer diagnostics

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

C2 Status Your boiler is currently attempting to start up and light the flame to provide heating or hot water. e44 Diagnostic Your boiler's internal computer has detected an error in its configuration settings and needs a professional to reset internal parameters.