Potterton
Potterton Boilers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Boiler will not ignite, display shows E01, no flame symbol, heating and hot water not working
Ignition Lockout / Flame Failure
E02
Boiler locks out shortly after starting, display shows E02, burner shuts down within seconds
Flame Detection Failure / Flame Signal Lost
E03
Boiler attempts to start then shuts down with E03, fan may run briefly, no ignition
Fan / Air Pressure Switch Fault
E04
Boiler shows E04 and will not fire, may occur intermittently during operation
Flow Thermistor / NTC Sensor Fault
E05
Boiler displays E05, shuts down on high temperature, may be hot to touch on flow pipe
Overheat Thermostat Trip / High Limit Lockout
E06
Boiler shows E06, hot water temperature unstable or boiler shuts down during hot water demand
DHW Thermistor / NTC Sensor Fault
E09
Boiler displays E09 and will not operate, often after a power surge or water ingress.
PCB / Control Board Fault
E10
Boiler displays E10, system pressure gauge is low, and the boiler will not fire.
Low Water Pressure / System Pressure Fault
E11
Boiler intermittently locks out with E11, especially when heating is on for long periods.
Return Thermistor / NTC Sensor Fault
E119
Boiler displays E119; the pressure gauge is near zero, and the boiler will not fire.
Low System Pressure Lockout
E12
Boiler displays E12, which may be accompanied by noisy operation or rapid cycling.
Flow/Return Temperature Differential Fault
E13
Boiler displays E13 and shuts down, often associated with flue or condensate issues.
Flue Gas / Combustion Safety Fault
E133
Boiler displays E133, indicating no ignition, often after a gas supply interruption.
Ignition Lockout / Gas Supply Interruption
E15
Boiler displays E15, with no heating or hot water, and the fan may not start.
Fan Speed / Fan Feedback Fault
E16
Boiler intermittently locks out with E16, particularly during hot water use.
DHW Flow Sensor / Turbine Fault
E160
Boiler displays E160, a fan-related error, and the boiler will not fire.
Fan Fault / No Fan Feedback
E168
Boiler intermittently displays E168, leading to random lockouts, often after power fluctuations.
General PCB / Power Supply Fault
E193
Boiler displays E193, often associated with pump or flow issues on system boilers.
Pump / Flow Detection Fault
E20
Boiler displays E20 and will not start, often after wiring changes or thermostat replacement.
External Control / Thermostat Fault
E20X
Boiler displays a generic E2x series code related to sensor or temperature faults.
General Temperature Sensor / NTC Fault
E25
Boiler displays E25, accompanied by noisy boiling or kettling sounds from the heat exchanger.
Primary Heat Exchanger Overheat / Flow Restriction
E28
Boiler displays E28, often associated with condensate issues or a blocked trap.
Condensate Drain / Trap Fault
E40
Boiler displays E40, no response to control inputs, possibly after a power cut.
Communication / Internal Bus Fault
E50
Boiler displays E50; the fan runs but there is no ignition, which may indicate a gas valve or combustion fault.
Gas Valve / Combustion Control Fault
E60
Boiler displays E60, indicating hot water priority or diverter valve related issues; heating may not work.
Diverter Valve Position Fault
Symptom
Boiler cycles on and off frequently, radiators never reach full temperature
Short Cycling / Control Strategy Issue
Symptom
Boiler emits a burning smell or visible smoke from the casing
Overheating / Electrical Burn
Symptom
Boiler flue terminal dripping water or staining the wall outside
Condensate / Flue Drainage Issue
Symptom
Boiler frequently loses pressure and needs topping up every few days
Chronic Pressure Loss
Symptom
Boiler leaking water from underneath the casing or from pipe connections.
Internal Water Leak
Symptom
Boiler locked out with red light but no code on older Potterton models
Generic Lockout (Legacy Boiler)
Symptom
Boiler makes loud banging or knocking noises when starting or stopping (water hammer/kettling)
Hydraulic Shock / Kettling
Symptom
Boiler pressure rises rapidly when heating is on and discharges water outside
Over-Pressurisation / Expansion Vessel Failure
Symptom
Boiler runs but makes a high-pitched whine or humming noise
Fan or Pump Acoustic Noise
Symptom
Boiler runs but radiators do not get hot or are only partially warm
Poor Circulation / System Balancing Fault
Symptom
Boiler will not start at all, no lights or display
No Power / Electrical Supply Fault
Symptom
Hot water temperature fluctuates or runs hot then cold during shower use
Unstable DHW Temperature Control
Symptom
No hot water from taps but central heating works normally (combi boiler)
DHW Priority / Diverter Valve Fault
Symptom
Radiators get hot when only hot water is demanded (combi or system with 3-port valve)
Cross-Flow / Motorised Valve Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Boiler will not ignite, display shows E01, no flame symbol, heating and hot water not working
|
Ignition Lockout / Flame Failure | View Details |
| E02 |
Boiler locks out shortly after starting, display shows E02, burner shuts down within seconds
|
Flame Detection Failure / Flame Signal Lost | View Details |
| E03 |
Boiler attempts to start then shuts down with E03, fan may run briefly, no ignition
|
Fan / Air Pressure Switch Fault | View Details |
| E04 |
Boiler shows E04 and will not fire, may occur intermittently during operation
|
Flow Thermistor / NTC Sensor Fault | View Details |
| E05 |
Boiler displays E05, shuts down on high temperature, may be hot to touch on flow pipe
|
Overheat Thermostat Trip / High Limit Lockout | View Details |
| E06 |
Boiler shows E06, hot water temperature unstable or boiler shuts down during hot water demand
|
DHW Thermistor / NTC Sensor Fault | View Details |
| E09 |
Boiler displays E09 and will not operate, often after a power surge or water ingress.
|
PCB / Control Board Fault | View Details |
| E10 |
Boiler displays E10, system pressure gauge is low, and the boiler will not fire.
|
Low Water Pressure / System Pressure Fault | View Details |
| E11 |
Boiler intermittently locks out with E11, especially when heating is on for long periods.
|
Return Thermistor / NTC Sensor Fault | View Details |
| E119 |
Boiler displays E119; the pressure gauge is near zero, and the boiler will not fire.
|
Low System Pressure Lockout | View Details |
| E12 |
Boiler displays E12, which may be accompanied by noisy operation or rapid cycling.
|
Flow/Return Temperature Differential Fault | View Details |
| E13 |
Boiler displays E13 and shuts down, often associated with flue or condensate issues.
|
Flue Gas / Combustion Safety Fault | View Details |
| E133 |
Boiler displays E133, indicating no ignition, often after a gas supply interruption.
|
Ignition Lockout / Gas Supply Interruption | View Details |
| E15 |
Boiler displays E15, with no heating or hot water, and the fan may not start.
|
Fan Speed / Fan Feedback Fault | View Details |
| E16 |
Boiler intermittently locks out with E16, particularly during hot water use.
|
DHW Flow Sensor / Turbine Fault | View Details |
| E160 |
Boiler displays E160, a fan-related error, and the boiler will not fire.
|
Fan Fault / No Fan Feedback | View Details |
| E168 |
Boiler intermittently displays E168, leading to random lockouts, often after power fluctuations.
|
General PCB / Power Supply Fault | View Details |
| E193 |
Boiler displays E193, often associated with pump or flow issues on system boilers.
|
Pump / Flow Detection Fault | View Details |
| E20 |
Boiler displays E20 and will not start, often after wiring changes or thermostat replacement.
|
External Control / Thermostat Fault | View Details |
| E20X |
Boiler displays a generic E2x series code related to sensor or temperature faults.
|
General Temperature Sensor / NTC Fault | View Details |
| E25 |
Boiler displays E25, accompanied by noisy boiling or kettling sounds from the heat exchanger.
|
Primary Heat Exchanger Overheat / Flow Restriction | View Details |
| E28 |
Boiler displays E28, often associated with condensate issues or a blocked trap.
|
Condensate Drain / Trap Fault | View Details |
| E40 |
Boiler displays E40, no response to control inputs, possibly after a power cut.
|
Communication / Internal Bus Fault | View Details |
| E50 |
Boiler displays E50; the fan runs but there is no ignition, which may indicate a gas valve or combustion fault.
|
Gas Valve / Combustion Control Fault | View Details |
| E60 |
Boiler displays E60, indicating hot water priority or diverter valve related issues; heating may not work.
|
Diverter Valve Position Fault | View Details |
| – |
Boiler cycles on and off frequently, radiators never reach full temperature
|
Short Cycling / Control Strategy Issue | View Details |
| – |
Boiler emits a burning smell or visible smoke from the casing
|
Overheating / Electrical Burn | View Details |
| – |
Boiler flue terminal dripping water or staining the wall outside
|
Condensate / Flue Drainage Issue | View Details |
| – |
Boiler frequently loses pressure and needs topping up every few days
|
Chronic Pressure Loss | View Details |
| – |
Boiler leaking water from underneath the casing or from pipe connections.
|
Internal Water Leak | View Details |
| – |
Boiler locked out with red light but no code on older Potterton models
|
Generic Lockout (Legacy Boiler) | View Details |
| – |
Boiler makes loud banging or knocking noises when starting or stopping (water hammer/kettling)
|
Hydraulic Shock / Kettling | View Details |
| – |
Boiler pressure rises rapidly when heating is on and discharges water outside
|
Over-Pressurisation / Expansion Vessel Failure | View Details |
| – |
Boiler runs but makes a high-pitched whine or humming noise
|
Fan or Pump Acoustic Noise | View Details |
| – |
Boiler runs but radiators do not get hot or are only partially warm
|
Poor Circulation / System Balancing Fault | View Details |
| – |
Boiler will not start at all, no lights or display
|
No Power / Electrical Supply Fault | View Details |
| – |
Hot water temperature fluctuates or runs hot then cold during shower use
|
Unstable DHW Temperature Control | View Details |
| – |
No hot water from taps but central heating works normally (combi boiler)
|
DHW Priority / Diverter Valve Fault | View Details |
| – |
Radiators get hot when only hot water is demanded (combi or system with 3-port valve)
|
Cross-Flow / Motorised Valve Fault | View Details |
No matching codes found
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