BoilerFaultCodes 8
Controlled stop (flow set point exceeded by 5°C)
Remeha Avanta 28c Fault codes & diagnostics
22 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Combi Natural Gas 24 kW 2005 onwards Discontinued
GC Numbers 47-673-0347-673-0247-673-04
Replaced by: Avanta Ace
Download the Remeha Avanta 28c 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. 5 High
1 Medium
4 Low
12 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 |
|---|---|---|
| 47-673-03 | Avanta Plus 35c | 2005–present |
| 47-673-02 | Avanta Plus 28c | 2005–present |
| 47-673-04 | Avanta Plus 39c | 2005–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 Remeha Avanta 28c faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 22 documented codes
Tap any card for details
9
External interlock circuit is open; boiler shuts down
d5
Control stop: set flow temperature (t1) has already been reached and the heating demand still exists (3 till 10 minutes).
d8
Control stop: measured flow temperature (t1) is higher than the flow temperature set (Tset flow).
d9
Shut down: maximum temperature rise is exceeded or if the dT between the supply and return temperature ≥ 45°C or a rate of rise in the flow temperature > 1°C/sec.
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.
Your boiler is perfectly healthy and is simply resting in its normal standby state, waiting for a signal to provide heating or hot water.
What to check first
- Check that your room thermostat or programmer is set to a temperature higher than the current room temperature
- Ensure your hot water tap is turned on fully if you are testing for hot water
Related codes
E01 Your boiler is trying to start up, but it cannot successfully light the internal flame after several attempts, so it has shut down for safety.
Your boiler is trying to start up, but it cannot successfully light the internal flame after several attempts, so it has shut down for safety.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Flame rectification probe
Related codes
é1 Your boiler is currently performing a necessary safety check before it attempts to ignite, but it has stalled at this initial stage.
Your boiler is currently performing a necessary safety check before it attempts to ignite, but it has stalled at this initial stage.
Parts commonly replaced
- Fan
- Air pressure switch
- Printed Circuit Board (PCB)
Related codes
é2 Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.
Your boiler is failing to light the flame, which means it cannot produce any heating or hot water for your home.
Parts commonly replaced
- Ignition electrode
- Gas valve
- PCB
Related codes
é3
Your boiler is currently working correctly and is simply letting you know it is busy heating your radiators.
Showing 11–20 of 22
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.
Your boiler has failed to light the flame after several attempts and has switched itself off to prevent a build-up of unburnt gas.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Ignition transformer
Related codes
é5
Your boiler is currently in a temporary cooling-down period and will restart automatically once it reaches the required temperature.
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.
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.
Parts commonly replaced
- Pump
- PCB
Related codes
é7 Your boiler has detected that the water pressure inside the system is far too low to function safely.
Your boiler has detected that the water pressure inside the system is far too low to function safely.
What to check first
- Locate the filling loop (usually two silver taps connected by a braided hose) underneath the boiler.
- Gradually open the taps to let mains water into the heating system until the pressure gauge reads between 1.0 and 1.5 bar.
- 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
é8
Fan fault
é10
Error code requiring restart via reset key
é11
Air box temperature to high
é13
Error code requiring restart via reset key
é43
Parameter limits
é44
Parameter check
Showing 21–22 of 22
é45
Default parameters
OT ERROR Your boiler's external temperature sensor and frost protection thermostat are sending conflicting signals to your heating controller.
Your boiler's external temperature sensor and frost protection thermostat are sending conflicting signals to your heating controller.
Parts commonly replaced
- Outside temperature sensor
- Frost thermostat
- Wiring harness