Ravenheat RSF 82E Fault codes & diagnostics

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

Combi Natural Gas 24 kW Discontinued

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47 High 2 Medium
Just want the most common Ravenheat RSF 82E faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 49 documented codes

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01

Your boiler has failed to light, which means your heating and hot water will not work until the system is reset or repaired.

High DIY-safe £150-380

What to check first

  1. Locate the reset button or dial on the front control panel
  2. Press or turn to 'Reset' for several seconds, then release
  3. Check if your gas prepay meter has credit and that the main gas lever is open

Parts commonly replaced

  • Ignition Control Board
  • Gas Valve
  • Fan Assembly

Related codes

Full explanation for 01
02

Your boiler has likely overheated or a safety sensor has detected an incorrect temperature, causing it to shut down for safety.

High DIY-safe £100-250

What to check first

  1. Locate the reset button or control knob on the front panel
  2. Press and hold the reset button for five seconds
  3. Check that your radiator valves are open and that the system pressure is between 1 and 1.5 bar

Parts commonly replaced

  • Overheat Thermostat
  • Temperature Sensor (NTC Thermistor)
  • Circulation Pump

Related codes

Full explanation for 02
02E

Your boiler is struggling to move water around the system, which is causing it to shut down to prevent overheating.

High Engineer only £180-£350

Parts commonly replaced

  • Circulation Pump
  • Pump Capacitor
  • Main PCB

Related codes

Full explanation for 02E
03E

Your boiler is unable to correctly monitor the water moving through the system, which is preventing it from heating up safely.

High Engineer only £120-210

Parts commonly replaced

  • Flow sensor
  • Flow switch
  • Wiring harness

Related codes

Full explanation for 03E
04

Your boiler has switched itself off because it has reached an unsafe temperature, likely due to a circulation issue or a faulty internal safety switch.

High Engineer only £120-250

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Limit Thermistor

Related codes

Full explanation for 04
04E

Your boiler is struggling to provide hot water because the specific sensor used to monitor water temperature has developed a fault.

Medium Engineer only £90-160

Parts commonly replaced

  • Domestic Hot Water (DHW) Thermistor
  • NTC Sensor

Related codes

Full explanation for 04E
05E

Your boiler has detected that the internal fan is not working correctly, which prevents the system from safely venting gases and starting the ignition process.

High Engineer only £180-320

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Main PCB

Related codes

Full explanation for 05E
06E

Your boiler has detected that the water inside the central heating system is getting too hot, causing it to shut down for safety.

High DIY-safe £90-180

What to check first

  1. Check that your radiator valves are fully open
  2. Ensure the boiler pressure is between 1 and 1.5 bar
  3. Reset the boiler using the control knob to see if the fault clears

Parts commonly replaced

  • Central heating thermistor (NTC sensor)
  • Circulation pump
  • Heat exchanger

Related codes

Full explanation for 06E
08E

Your boiler has detected that there is not enough water in the system to operate safely, which is usually caused by a small leak or air being bled from radiators.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (a flexible silver hose) underneath or near the boiler.
  2. Slowly open the one or two taps/valves on the filling loop until you hear water entering the system.
  3. Watch the pressure gauge and close the taps once the needle reaches between 1.0 and 1.5 bar.
  4. Ensure the taps are fully closed and restart the boiler.

Parts commonly replaced

  • Filling loop valves
  • Expansion vessel
  • Pressure relief valve
Full explanation for 08E
09E

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

High DIY-safe £120-250

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure there is enough water pressure on the boiler's pressure gauge
  3. Allow the boiler to cool down and press the reset button

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger Flush

Related codes

Full explanation for 09E
Showing 11–20 of 49
10E

Your boiler has too much water inside it, which is putting excess stress on the internal system.

High DIY-safe £80-180

What to check first

  1. Check that the filling loop valves are fully closed and not leaking
  2. Bleed water from a radiator using a bleed key to lower the system pressure
  3. Monitor the pressure gauge until it returns to between 1.0 and 1.5 bar
  4. Press the reset button to clear the fault code

Parts commonly replaced

  • Filling loop valve
  • Expansion vessel
  • Pressure relief valve

Related codes

Full explanation for 10E
12

Your boiler's internal thermometer that measures the temperature for your central heating has stopped working correctly, and your heating will likely fail to turn on as a result.

High Engineer only £90-160

Parts commonly replaced

  • NTC Heating Sensor
  • Sensor Wiring Harness

Related codes

Full explanation for 12
13E

Your boiler's internal computer has encountered a digital glitch and cannot process its instructions correctly.

High DIY-safe £180-350

What to check first

  1. Locate the reset button or switch on the front control panel
  2. Press and hold the reset button for five seconds
  3. Wait for the boiler to complete its startup sequence

Parts commonly replaced

  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for 13E
17

Your boiler has detected an electrical problem with the fan, which means it cannot safely clear away waste gases and will not start.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Wiring harness
Full explanation for 17
21E

Your boiler has detected that the water coming back from your radiators is too hot, causing the system to shut down for safety.

High DIY-safe £90-180

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the boiler pressure is between 1 and 1.5 bar on the gauge
  3. Reset the boiler using the control knob to see if the fault clears

Parts commonly replaced

  • CH Return NTC Sensor
  • Central Heating Pump
  • Main Heat Exchanger (if scaled up)

Related codes

Full explanation for 21E
22E

Your boiler has shut down because a safety sensor has detected that the exhaust gases are getting too hot, which could indicate a blockage or a heat exchange problem.

High Engineer only £120-280

Parts commonly replaced

  • Flue Thermistor (NTC)
  • Main Heat Exchanger
  • Flue Hood Assembly

Related codes

Full explanation for 22E
23E

Your boiler has detected a fault with the sensor that monitors exhaust gases, and has shut down as a safety precaution.

High Engineer only £120-£190

Parts commonly replaced

  • Flue Gas Sensor (NTC)
  • Wiring Harness

Related codes

Full explanation for 23E
24E

Your boiler has detected a problem with the sensor that monitors the temperature of the water returning from your radiators, preventing it from heating your home correctly.

High Engineer only £90-160

Parts commonly replaced

  • Central heating return thermistor (NTC sensor)
  • Connecting wiring harness

Related codes

Full explanation for 24E
25E

Your boiler has detected that the water inside the heating unit has frozen due to extremely cold weather, preventing it from starting up safely.

High DIY-safe £0-120

What to check first

  1. Turn the boiler power off at the fused spur switch.
  2. Place a hot water bottle or a warm (not boiling) damp cloth against the pipes underneath the boiler to gently thaw the unit.
  3. If your condensate pipe (usually a white plastic pipe going outside) is frozen, pour warm water over it to clear the ice blockage.
  4. Once thawed, reset the boiler using the control knob.

Parts commonly replaced

  • None (usually just requires thawing)
  • External pipe insulation (Lagging)

Related codes

Full explanation for 25E
28

Your boiler has detected that there is not enough water pressure or flow to operate safely, which is preventing your heating and hot water from working.

High DIY-safe £120-280

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 external filling loop to top up the system with water.
  3. Reset the boiler once the correct pressure is reached to see if the fault clears.

Parts commonly replaced

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

Related codes

Full explanation for 28
Showing 21–30 of 49
29E

Your boiler has detected that the hot water temperature has become too high, causing it to shut down for safety.

High Engineer only £90-180

Parts commonly replaced

  • Domestic Hot Water (DHW) Sensor
  • NTC Thermistor
  • Diverter Valve

Related codes

Full explanation for 29E
30

Your boiler has detected that the exhaust gases are too hot or the sensor monitoring them has failed, causing the system to shut down for safety.

High Engineer only £120-280

Parts commonly replaced

  • Flue Limit Thermostat
  • Main Heat Exchanger
  • NTC Sensor
Full explanation for 30
31

Your boiler has detected that a safety sensor monitoring the exhaust fumes is faulty or has recorded an unsafe temperature, causing the system to shut down for your protection.

High Engineer only £90-160

Parts commonly replaced

  • Flue Gas Temperature Sensor (NTC)
  • Wiring Harness
  • Main Circuit Board (PCB)

Related codes

Full explanation for 31
31E

Your boiler is having trouble communicating with your smart thermostat or external heater controls, preventing the system from knowing when to turn on.

High DIY-safe £100-250

What to check first

  1. Check that your external thermostat or programmer has power and fresh batteries
  2. Ensure any wireless receiver boxes plugged into the wall are switched on
  3. Turn the boiler power off and on again at the fused spur switch to reset the connection

Parts commonly replaced

  • External Thermostat
  • OpenTherm Interface Module
  • Main PCB
Full explanation for 31E
41E

Your boiler has detected that the water is not circulating properly through the system, causing an unusual temperature gap between the outgoing and incoming pipes.

High DIY-safe £120-£350

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the system water pressure is between 1.0 and 1.5 bar on the pressure gauge
  3. Check for any obvious blockages or trapped air by bleeding your radiators

Parts commonly replaced

  • Circulation Pump
  • Main Heat Exchanger
  • Flow/Return NTC Sensors

Related codes

Full explanation for 41E
42E

Your boiler has detected an unusual temperature difference between the pipes, which usually means the water isn't flowing through the system correctly.

High Engineer only £120-£350

Parts commonly replaced

  • Circulation pump
  • Main heat exchanger
  • Flow/Return thermistors
Full explanation for 42E
44E

Your boiler has detected an unusual temperature difference between the water going out to your radiators and the water coming back, suggesting a possible circulation issue.

High Engineer only £120-280

Parts commonly replaced

  • Central Heating Thermistor (NTC Sensor)
  • Circulation Pump
  • Main PCB

Related codes

Full explanation for 44E
46E

Your boiler has detected a fault with the sensor that monitors internal water pressure, meaning it cannot confirm if there is enough water to run safely.

High Engineer only £120-£210

Parts commonly replaced

  • Water pressure sensor
  • Wiring harness
Full explanation for 46E
E02

Your boiler is struggling to move water around the pipes in your home, which is preventing it from heating up correctly.

High Engineer only £180-350

Parts commonly replaced

  • Central heating pump
  • Flow switch
  • Main PCB

Related codes

Full explanation for E02
E03

Your boiler is unable to correctly monitor the flow of water because a key internal sensor has failed, preventing it from heating up safely.

High Engineer only £120-£200

Parts commonly replaced

  • Flow sensor
  • NTC thermistor
  • Wiring harness

Related codes

Full explanation for E03
Showing 31–40 of 49
E04

Your boiler is struggling to accurately measure the temperature of your hot water, which typically means your taps will only run cold.

High Engineer only £90-160

Parts commonly replaced

  • DHW Temperature Sensor (NTC Thermistor)
  • Wiring harness connectors

Related codes

Full explanation for E04
E05

Your boiler has detected an issue with the fan that clears away waste gases, meaning it cannot start safely to provide heating or hot water.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Air pressure switch
  • Main circuit board (PCB)

Related codes

Full explanation for E05
E06

Your boiler has detected that the water in your heating system is getting too hot, causing it to shut down for safety.

High Engineer only £90-180

Parts commonly replaced

  • CH Thermistor (NTC Sensor)
  • Internal Pump
  • Main Heat Exchanger

Related codes

Full explanation for E06
E08

Your boiler has detected that there is not enough water in the system to operate safely, which has caused it to shut down.

High DIY-safe £0-120

What to check first

  1. Locate the filling loop (usually a silver braided hose) underneath the boiler.
  2. Open the small valve or valves on the loop slowly until you hear water entering.
  3. Watch the pressure gauge until it reaches between 1 and 1.5 bar, then close the valves tightly.

Parts commonly replaced

  • Filling loop
  • Pressure sensor
  • Expansion vessel

Related codes

Full explanation for E08
E09

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

High DIY-safe £100-280

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure your system water pressure is between 1 and 1.5 bar on the gauge
  3. Press the reset button once the boiler has cooled down

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Heat Exchanger

Related codes

Full explanation for E09
E10

Your boiler has too much water in the system, which puts unnecessary stress on the internal pipes and seals.

Medium DIY-safe £60-120

What to check first

  1. Check that the filling loop valves are fully closed
  2. Bleed water from a radiator using a bleed key into a container
  3. Monitor the pressure gauge until it returns to between 1.0 and 1.5 bar
  4. Press the reset button if the error code persists

Parts commonly replaced

  • Filling loop valve
  • Expansion vessel
  • Pressure relief valve

Related codes

Full explanation for E10
E13

Your boiler's internal computer has encountered a glitch or software malfunction that is preventing it from running properly.

High DIY-safe £250-450

What to check first

  1. Locate the reset button on the boiler control panel.
  2. Press and hold the reset button for 5 seconds, then release.
  3. Wait for the boiler to restart; if the code persists, a professional repair is required.

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
Full explanation for E13
E21

Your boiler has detected that the water coming back from your radiators is getting too hot, causing the system to shut down for safety.

High DIY-safe £90-180

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the central heating system pressure is between 1.0 and 1.5 bar
  3. Reset the boiler to see if the fault clears

Parts commonly replaced

  • CH Return NTC Sensor
  • System Pump
  • Main Heat Exchanger (if blocked)

Related codes

Full explanation for E21
E22

Your boiler has detected that the exhaust gases are getting much too hot, which has caused the system to shut down for safety.

High Engineer only £120-250

Parts commonly replaced

  • Flue Sensor (NTC)
  • Main Heat Exchanger
  • Burner Seals

Related codes

Full explanation for E22
E23

Your boiler has detected a fault with the part that monitors the temperature of the exhaust gases, causing the system to shut down for safety.

High Engineer only £120-220

Parts commonly replaced

  • Flue Sensor (NTC)
  • Wiring Harness
  • Main PCB

Related codes

Full explanation for E23
Showing 41–49 of 49
E24

Your boiler has detected a problem with the sensor that monitors the temperature of the water returning from your radiators, which prevents it from heating your home correctly.

High Engineer only £90-160

Parts commonly replaced

  • CH Return NTC Thermistor
  • Wiring harness connection

Related codes

Full explanation for E24
E25

Your boiler's main internal unit is currently blocked by ice or is too cold to operate safely.

High DIY-safe £0-120

What to check first

  1. Turn the boiler power off at the fused spur switch.
  2. Place hot water bottles or use a hairdryer on a low setting against the main heat exchanger and pipes inside the casing (if accessible without tools) or simply increase the temperature in the room for several hours.
  3. Turn the boiler back on and reset the system using the control dial.

Parts commonly replaced

  • Main Heat Exchanger
  • Thermistor

Related codes

Full explanation for E25
E29

Your boiler has detected that the water used for your taps is getting too hot and has shut down as a safety precaution.

High Engineer only £90-180

Parts commonly replaced

  • DHW Temperature Sensor (NTC thermistor)
  • Heat Exchanger
  • Diverter Valve

Related codes

Full explanation for E29
E31

Your boiler has lost its digital connection with your external heating controls or smart thermostat.

High DIY-safe £90-250

What to check first

  1. Check that your smart thermostat or wall controller is powered on.
  2. Replace the batteries in your thermostat if it uses them.
  3. Restart the boiler by turning the power off and back on at the fused spur switch.

Parts commonly replaced

  • OpenTherm Interface Module
  • External Thermostat/Receiver
  • Main PCB

Related codes

Full explanation for E31
E41

Your boiler has detected that water is not circulating correctly through the system, causing an unusual temperature difference between the pipes.

High DIY-safe £120-£350

What to check first

  1. Check that all radiator valves (TRVs) are fully open
  2. Ensure your boiler pressure is between 1.0 and 1.5 bar on the gauge
  3. Bleed your radiators to remove any trapped air pockets
  4. Try resetting the boiler using the control knob

Parts commonly replaced

  • Circulation pump
  • Temperature sensors (NTC thermistors)
  • Main Heat Exchanger (if blocked)

Related codes

Full explanation for E41
E42

Your boiler has detected an unusual temperature difference between the water sending heat out and the water returning, which usually indicates a circulation problem.

High DIY-safe £120-280

What to check first

  1. Check that all radiator valves are fully open
  2. Ensure the system pressure is between 1.0 and 1.5 bar on the pressure gauge
  3. Bleed all radiators to remove trapped air pockets

Parts commonly replaced

  • Circulation Pump
  • Central Heating NTC Sensor
  • Main Heat Exchanger (if blocked)

Related codes

Full explanation for E42
E43

Your boiler has detected an unusual temperature difference between internal sensors, suggesting a possible internal blockage or a part failing to read heat correctly.

High Engineer only £120-280

Parts commonly replaced

  • NTC Temperature Sensor
  • Central Heating Pump
  • Main Heat Exchanger

Related codes

Full explanation for E43
E44

Your boiler has detected an unusual temperature difference between internal sensors, suggesting that water is not flowing correctly through the system.

High Engineer only £140-£350

Parts commonly replaced

  • Central heating thermistor
  • Circulation pump
  • Heat exchanger

Related codes

Full explanation for E44
E46

Your boiler has lost track of its internal water levels because the monitoring sensor has developed an electrical fault.

High Engineer only £120-£200

Parts commonly replaced

  • Water pressure sensor
  • Wiring loom

Related codes

Full explanation for E46