Ravenheat Rsf Fault codes & diagnostics

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

Combi Natural Gas 24-28 kW 1997-2002 Discontinued
GC Number 47-581-05

Replaced by: HE series

Download the Ravenheat Rsf 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.
10 High
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
47-581-05 RSF 820/20T 1997–2002
Just want the most common Ravenheat Rsf faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 10 documented codes

Tap any card for details

01

Your boiler has failed to light, which means you will not have any heating or hot water until the issue is resolved.

High DIY-safe £150-350

What to check first

  1. Check that your gas supply is turned on and other gas appliances are working
  2. Press and hold the reset button for 5 seconds
  3. Ensure your credit meter has sufficient funds

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Fan
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 01
02

Your boiler has detected an incorrect temperature reading and needs to be restarted to clear the error.

High DIY-safe £90-180

What to check first

  1. Locate the reset button or dial on the front control panel.
  2. Press and hold the reset button for 5 seconds or turn the dial to 'R' and back.
  3. Wait for the boiler to complete its startup sequence and check if the code clears.

Parts commonly replaced

  • Negative Temperature Coefficient (NTC) Thermistor
  • Overheat Thermostat
  • Main PCB

Related codes

Full explanation for 02
04

Your boiler has switched itself off because it got too hot, likely due to a circulation issue or a faulty internal safety sensor.

High Engineer only £90-180

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Printed Circuit Board (PCB)

Related codes

Full explanation for 04
12

Your boiler has lost its ability to measure the temperature of the water in your radiators, which means it cannot safely heat your home.

High Engineer only £90-160

Parts commonly replaced

  • Central Heating NTC Sensor
  • Sensor Wiring Harness
Full explanation for 12
17

Your boiler has stopped working because the fan that clears out exhaust gases is not receiving the correct amount of electrical power.

High Engineer only £180-£350

Parts commonly replaced

  • Fan Motor
  • Main Printed Circuit Board (PCB)
  • Wiring Loom

Related codes

Full explanation for 17
28

Your boiler has detected that there is not enough water pressure or movement to operate safely, causing the system to shut down.

High DIY-safe £80-280

What to check first

  1. Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.
  2. If the pressure is too low, use the filling loop valves to top up the water level.
  3. Ensure all radiator valves and the main isolation valves under the boiler are fully open.

Parts commonly replaced

  • Low water pressure switch
  • Circulation pump
  • Expansion vessel recharge

Related codes

Full explanation for 28
30

Your boiler has shut down because a sensor has detected that the exhaust gases are too hot, which is a safety precaution to prevent internal damage.

High Engineer only £120-280

Parts commonly replaced

  • Flue NTC sensor
  • Main Heat Exchanger
  • Thermistor
Full explanation for 30
31

Your boiler has sensed that the gases escaping through the exhaust pipe are too hot or the sensor detecting them is broken, so it has shut down for safety.

High Engineer only £100-£190

Parts commonly replaced

  • Flue Gas NTC Sensor
  • Main PCB
  • Heat Exchanger cleaning/descaling

Related codes

Full explanation for 31
E06

Your boiler has shut down because a temperature sensor has detected that the water in your heating system is getting too hot.

High Engineer only £90-180

Parts commonly replaced

  • CH Temperature Sensor (NTC thermistor)
  • Wiring harness
  • Main PCB

Related codes

Full explanation for E06
E23

Your boiler has detected an issue with the sensor that monitors exhaust gases, and it has shut down for safety purposes.

High Engineer only £120-190

Parts commonly replaced

  • Flue Gas Sensor
  • Wiring harness

Related codes

Full explanation for E23