BoilerFaultCodes E00
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Warmflow Agentis Boilerhouse Fault codes & diagnostics
15 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Heat Only Oil 2018-present
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Severity at a glance
Each cell = one fault code. Hover to identify. 1 Emergency
11 High
1 Medium
1 Low
1 Unrated
Just want the most common Warmflow Agentis Boilerhouse faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes
All 15 documented codes
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E01 Your boiler has stopped running because it failed to light, likely due to a problem with the oil supply or a burner fault.
Your boiler has stopped running because it failed to light, likely due to a problem with the oil supply or a burner fault.
What to check first
- Check that your heating oil tank actually has fuel in it
- Ensure the oil supply valve from the tank is fully open
- Press the illuminated reset button on the front of the burner once
Parts commonly replaced
- Oil nozzle
- Oil pump
- Photocell
- Fuel filter
Related codes
E02 Your boiler has switched itself off because it has reached an unsafe temperature to prevent internal damage.
Your boiler has switched itself off because it has reached an unsafe temperature to prevent internal damage.
Parts commonly replaced
- Limit Thermostat
- Circulation Pump
- Printed Circuit Board (PCB)
Related codes
E04 Your boiler has detected that there is not enough water pressure in the pipes to operate safely.
Your boiler has detected that there is not enough water pressure in the pipes to operate safely.
What to check first
- Check the pressure gauge on the boiler or expansion vessel; it should be between 1.0 and 1.5 bar.
- Locate the external filling loop and slowly open the valves to top up the system with water until the gauge reaches 1.2 bar.
- Ensure both valves on the filling loop are closed tightly and reset the boiler.
Parts commonly replaced
- Filling loop
- Expansion vessel
- Pressure relief valve
Related codes
E05 Your boiler has lost its ability to monitor the temperature of the water leaving the unit, meaning it cannot operate safely and has shut down.
Your boiler has lost its ability to monitor the temperature of the water leaving the unit, meaning it cannot operate safely and has shut down.
Parts commonly replaced
- Flow NTC Temperature Sensor
- Sensor Wiring Harness
Related codes
E06 Your boiler has detected a problem with the sensor that monitors the temperature of your hot water, meaning it cannot safely provide hot water to your taps.
Your boiler has detected a problem with the sensor that monitors the temperature of your hot water, meaning it cannot safely provide hot water to your taps.
Parts commonly replaced
- DHW Flow NTC Sensor
- Sensor Wiring Harness
Related codes
E11 Your boiler's hot water tank sensor has moved out of position or failed, meaning the system can no longer accurately monitor the water temperature.
Your boiler's hot water tank sensor has moved out of position or failed, meaning the system can no longer accurately monitor the water temperature.
Parts commonly replaced
- NTC Temperature Sensor Probe
- Sensor Clip/Housing
Related codes
E12 Your boiler's hot water temperature sensor has developed a fault or become disconnected, meaning the system can no longer monitor the water temperature accurately.
Your boiler's hot water temperature sensor has developed a fault or become disconnected, meaning the system can no longer monitor the water temperature accurately.
Parts commonly replaced
- Tank Control NTC Sensor
- Sensor Wiring Harness
Related codes
E15 Your boiler has detected a fault with the sensor that monitors the temperature of the water returning from your radiators.
Your boiler has detected a fault with the sensor that monitors the temperature of the water returning from your radiators.
Parts commonly replaced
- CH Return NTC Sensor
- Wiring Harness
Related codes
E22 Your boiler's internal computer has suffered a software memory error and can no longer process instructions safely.
Your boiler's internal computer has suffered a software memory error and can no longer process instructions safely.
Parts commonly replaced
- Main Printed Circuit Board (PCB)
Related codes
E31 Your boiler is having trouble talking to the control panel or thermostat, meaning it cannot receive the instructions it needs to provide heating and hot water.
Your boiler is having trouble talking to the control panel or thermostat, meaning it cannot receive the instructions it needs to provide heating and hot water.
Parts commonly replaced
- Remote Control Panel
- Communication Cable
- Main PCB
Related codes
E32 Your boiler's main internal computer has lost communication with its control panel, meaning it can no longer send or receive the correct signals to run properly.
Your boiler's main internal computer has lost communication with its control panel, meaning it can no longer send or receive the correct signals to run properly.
Parts commonly replaced
- Main Control PCB
- MMI Display PCB
- Communication Ribbon Cable
Related codes
E46 Your boiler has lost its ability to monitor water pressure because the internal sensor is either broken or not communicating properly.
Your boiler has lost its ability to monitor water pressure because the internal sensor is either broken or not communicating properly.
Parts commonly replaced
- Water Pressure Sensor
- Sensor Wiring Harness
Related codes
E48 Your boiler has detected that there is too much water pressure in the system, which is preventing it from running safely.
Your boiler has detected that there is too much water pressure in the system, which is preventing it from running safely.
What to check first
- Check that the silver braided filling loop valves are tightly closed.
- Locate a radiator and use a bleed key to carefully release some water into a container.
- Monitor the pressure gauge on the boiler until it returns to the 'green' zone (typically 1.0 to 1.5 bar).
- Once the pressure is corrected, reset the boiler.
Parts commonly replaced
- Filling loop valve
- Expansion vessel
- Pressure relief valve
Related codes
E62 Your boiler's main internal computer and its control panel are having trouble talking to each other, which has locked the system for safety.
Your boiler's main internal computer and its control panel are having trouble talking to each other, which has locked the system for safety.
Parts commonly replaced
- Main Control PCB
- MMI Display Board
- Communication Ribbon Cable
Related codes
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