BoilerFaultCodes 0
Your boiler is currently running its internal water pump to safely move heat away from the heat exchanger after a cycle, which is a normal part of the shutdown process.
Atmos Interopen HE22 Fault codes & diagnostics
25 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Heat Only Natural Gas 2004-2018 Discontinued
GC Number 41-249-06
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Severity at a glance
Each cell = one fault code. Hover to identify. 22 High
3 Low
Just want the most common Atmos Interopen HE22 faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 25 documented codes
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0 0 Your boiler has detected an internal error during its automatic safety check and is unable to start because it cannot verify that its internal temperature sensors are reading correctly.
Your boiler has detected an internal error during its automatic safety check and is unable to start because it cannot verify that its internal temperature sensors are reading correctly.
Parts commonly replaced
- NTC Temperature Sensor
- PCB Control Board
Related codes
1 Your boiler has successfully reached its target temperature and is now resting as expected.
Your boiler has successfully reached its target temperature and is now resting as expected.
What to check first
- No action is required as this is a normal operating status
- Monitor the boiler to ensure it restarts automatically when the room or water temperature drops
2 Your boiler is currently running a routine internal safety check to ensure all its sensors and systems are working correctly before it starts up.
Your boiler is currently running a routine internal safety check to ensure all its sensors and systems are working correctly before it starts up.
What to check first
- Wait 5 to 10 minutes for the self-test process to complete.
- If the boiler remains on this code for more than 15 minutes, perform a soft reset using the reset button.
- If the code persists, turn the boiler off at the fused spur for 30 seconds and switch it back on.
Parts commonly replaced
- Main Control PCB
- Wiring Harness
Related codes
4 Your boiler has tried to light itself four times but has failed, so it has locked itself out for safety.
Your boiler has tried to light itself four times but has failed, so it has locked itself out for safety.
What to check first
- Check that your gas emergency control valve (gas tap) is in the 'on' position
- Ensure you have credit on your gas meter if you use a prepay system
- Check other gas appliances like a hob to see if there is a gas supply to the house
- Check that the white plastic condensate pipe outside hasn't frozen in cold weather
- Press the 'Reset' button on the boiler control panel
Parts commonly replaced
- Ignition Electrode
- Gas Valve
- Ignition Transformer
- Flame Sensor
Related codes
4 1 Your boiler is failing to light because it cannot detect a flame, meaning you currently have no heating or hot water.
Your boiler is failing to light because it cannot detect a flame, meaning you currently have no heating or hot water.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Flame rectification probe
Related codes
5 Your boiler is failing to stay alight because it cannot safely ignite the gas or clear away waste water.
Your boiler is failing to stay alight because it cannot safely ignite the gas or clear away waste water.
What to check first
- Check if the condensate pipe (the plastic pipe running outside) is frozen or blocked.
- Carefully thaw a frozen external pipe with warm—not boiling—water.
- Restart the boiler by pressing the reset button to see if it ignites.
Parts commonly replaced
- Ignition electrode
- Gas valve
- Condensate trap
Related codes
5 1 Your boiler is failing to light the burner despite several attempts, meaning you currently have no heating or hot water.
Your boiler is failing to light the burner despite several attempts, meaning you currently have no heating or hot water.
Parts commonly replaced
- Ignition electrode
- Gas valve
- PCB
Related codes
6 Your boiler is failing to light the gas or cannot identify that a flame is present, meaning your heating and hot water will not work.
Your boiler is failing to light the gas or cannot identify that a flame is present, meaning your heating and hot water will not work.
Parts commonly replaced
- Ignition cable
- Spark electrode/probe
- Ignition unit
- PCB (Controller)
Related codes
6 1 Your boiler has detected an issue with lighting or keeping the flame burning, so it has safely shut itself down to prevent gas from building up.
Your boiler has detected an issue with lighting or keeping the flame burning, so it has safely shut itself down to prevent gas from building up.
Parts commonly replaced
- Ignition electrode
- Flame rectification probe
- Gas valve
- PCB
Related codes
Showing 11–20 of 25
7 1 Your boiler has detected that its internal software settings have been accessed or modified via a computer, preventing it from operating normally.
Your boiler has detected that its internal software settings have been accessed or modified via a computer, preventing it from operating normally.
Parts commonly replaced
- Printed Circuit Board (PCB)
- Control module
Related codes
8 Your boiler has stopped working because the fan that helps remove exhaust gases isn't spinning at the correct speed.
Your boiler has stopped working because the fan that helps remove exhaust gases isn't spinning at the correct speed.
Parts commonly replaced
- Extraction Fan
- Main Control PCB
- Wiring Loom
Related codes
8 1 Your boiler has detected that the internal fan responsible for clearing exhaust gases is not spinning at the correct speed, so it has safely shut itself down to prevent unsafe operation.
Your boiler has detected that the internal fan responsible for clearing exhaust gases is not spinning at the correct speed, so it has safely shut itself down to prevent unsafe operation.
Parts commonly replaced
- Fan assembly
- Printed Circuit Board (PCB)
Related codes
10 Your boiler has stopped working because one of its internal heat sensors is no longer sending a reliable signal to the main control board.
Your boiler has stopped working because one of its internal heat sensors is no longer sending a reliable signal to the main control board.
Parts commonly replaced
- S1 Flow Temperature Sensor
- Wiring harness
Related codes
11 Your boiler has detected a problem with its primary internal temperature sensor, meaning it cannot safely monitor the heat of the water and has stopped running as a precaution.
Your boiler has detected a problem with its primary internal temperature sensor, meaning it cannot safely monitor the heat of the water and has stopped running as a precaution.
Parts commonly replaced
- S1 Flow Temperature Sensor
- Sensor Wiring Harness
Related codes
12 Your boiler has stopped working because one of its internal temperature sensors is not reporting correctly.
Your boiler has stopped working because one of its internal temperature sensors is not reporting correctly.
Parts commonly replaced
- S1 Flow Temperature Sensor
- Sensor wiring harness
Related codes
13 Your boiler has stopped working because its internal temperature sensor is failing or has a loose connection.
Your boiler has stopped working because its internal temperature sensor is failing or has a loose connection.
Parts commonly replaced
- Flow temperature sensor (S1)
- Sensor wiring harness
Related codes
14 Your boiler has stopped working because its main temperature sensor is unable to provide a reading to the control system.
Your boiler has stopped working because its main temperature sensor is unable to provide a reading to the control system.
Parts commonly replaced
- S1 flow temperature sensor
- Wiring harness connectors
Related codes
20 Your boiler has stopped working because one of its internal temperature sensors has stopped sending proper information to the control board.
Your boiler has stopped working because one of its internal temperature sensors has stopped sending proper information to the control board.
Parts commonly replaced
- NTC Temperature Sensor (S2)
- Sensor wiring harness
Related codes
21 Your boiler has stopped working because an internal temperature sensor is giving an incorrect reading or has a faulty connection.
Your boiler has stopped working because an internal temperature sensor is giving an incorrect reading or has a faulty connection.
Parts commonly replaced
- NTC Temperature Sensor (S2)
- Wiring Harness
Related codes
Showing 21–25 of 25
22 Your boiler has detected a problem with internal temperature sensing, meaning it cannot accurately monitor the water temperature and has stopped working for safety.
Your boiler has detected a problem with internal temperature sensing, meaning it cannot accurately monitor the water temperature and has stopped working for safety.
Parts commonly replaced
- NTC Temperature Sensor (S2)
- Sensor wiring harness
Related codes
23 Your boiler has stopped working because one of its internal temperature sensors is providing an incorrect reading or has a faulty connection.
Your boiler has stopped working because one of its internal temperature sensors is providing an incorrect reading or has a faulty connection.
Parts commonly replaced
- NTC Temperature Sensor (S2)
- Sensor wiring harness
Related codes
24 Your boiler has lost signal from an internal temperature sensor, preventing it from heating your home safely.
Your boiler has lost signal from an internal temperature sensor, preventing it from heating your home safely.
Parts commonly replaced
- S2 Return Water Sensor
- Sensor Wiring Harness
Related codes
29 Your boiler's internal computer has suffered an electrical failure and can no longer safely operate the gas supply.
Your boiler's internal computer has suffered an electrical failure and can no longer safely operate the gas supply.
Parts commonly replaced
- Main Printed Circuit Board (PCB)
- Control Unit
Related codes
30 Your boiler's electronic control board has suffered an internal electrical failure and can no longer safely operate the gas supply.
Your boiler's electronic control board has suffered an internal electrical failure and can no longer safely operate the gas supply.
Parts commonly replaced
- Main Printed Circuit Board (PCB)
- Control Box