Gledhill
Gledhill Water Heaters Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Gledhill thermal store / unvented water heater shows E01 and will not heat water.
Flow Temperature Sensor Fault
E02
Display shows E02, and water temperature is erratic or the unit shuts down.
Return Temperature Sensor Fault
E03
Gledhill water heater displays E03 and does not call for heat from the boiler or immersion.
Cylinder Thermistor / Store Temperature Sensor Fault
E04
E04 displayed and the unit will not operate; sometimes accompanied by a tripped safety thermostat.
Overheat Thermostat / High Limit Cut‑out Tripped
E05
E05 on display, no hot water, and the boiler does not fire when the cylinder is cold.
Flow Switch / Flow Sensor Fault (Primary or DHW)
E06
E06 displayed, the boiler runs but the store temperature does not rise correctly, or the unit locks out.
Primary Pump Fault / No Circulation
E07
E07 error and the boiler fails to fire when the store is cold.
Boiler Enable / Call for Heat Circuit Fault
E08
E08 displayed, and the immersion heater does not operate even when selected.
Immersion Heater Circuit Fault
E09
E09 on display, and the unit intermittently shuts down or resets.
Supply Voltage / Power Input Fault
E10
E10 displayed, no hot water, and the cold mains pressure appears normal.
Pressure / Flow Sensor Fault (Mains Inlet)
E11
E11 error, the unit will not start, sometimes accompanied by buzzing from the PCB area.
Relay / Output Driver Fault
E12
E12 displayed, and the hot water temperature overshoots or is too low despite sensor replacement.
Calibration / Sensor Range Error
E13
E13 error, unit locks out after running for a short period.
Store Overheat Detected by Sensor
E14
E14 displayed, no hot water, expansion vessel may be waterlogged.
Expansion / Pressure Control Fault
E15
E15 error, unit indicates low pressure or no water, may not fill correctly.
Low Water Level / Dry-Fire Protection Fault
E16
E16 displayed, unit reports a sensor short circuit.
NTC Sensor Short-Circuit Detected
E17
E17 displayed, unit reports a sensor open circuit.
NTC Sensor Open-Circuit Detected
E18
E18 error, unit indicates a communication fault between the display and main board.
Display / Interface Communication Error
E19
E19 displayed, unit fails self-test at power-up.
Internal Self-Test / Firmware Error
E20
E20 error, unit indicates pump overrun or that it is stuck on.
Pump Overrun / Feedback Fault
Symptom
Gledhill cylinder shows signs of corrosion around fittings or at the base.
Corrosion / Potential Cylinder Failure
Symptom
Gledhill thermal store boiler runs continuously and the store overheats.
Boiler Control Stuck On
Symptom
Gledhill thermal store pump runs but radiators or hot water do not heat properly.
Poor Primary Circulation / Balancing Issue
Symptom
Gledhill unit emits a burning smell or shows signs of scorching near electrical components.
Overheating Electrical Component
Symptom
Gledhill unit makes a constant running noise even when there is no demand for hot water or heating.
Pump or Fan Running Continuously
Symptom
Gledhill unit trips the RCD or MCB when heating starts.
Electrical Short or Earth Leakage
Symptom
Gledhill unit’s display works, but buttons or controls do not respond.
User Interface / Keypad Failure
Symptom
Gledhill water heater completely dead, no lights or display.
No Power / Dead Appliance
Symptom
Gledhill water heater frequently cycles on and off, causing temperature swings and wear.
Short Cycling / Control Hysteresis Issue
Symptom
Hot water runs hot then quickly goes cold during a shower on a Gledhill mains-pressure unit.
Hot Water Temperature Fluctuation / Flow Control Issue
Symptom
Hot water temperature at taps is dangerously high from a Gledhill cylinder.
Over-Temperature at Outlets
Symptom
No hot water at taps; Gledhill thermal store or unvented cylinder appears powered, but water remains cold.
No Heat Generation / Heat Source Not Operating
Symptom
Noisy operation from Gledhill water heater, including humming, banging, or gurgling sounds.
Hydraulic Noise / Air and Scale Issues
Symptom
Very low hot water pressure or flow from Gledhill mains-pressure cylinder.
Reduced Hot Water Flow
Symptom
Water dripping from the tundish on a Gledhill unvented cylinder.
Pressure Relief Valve Discharge
Symptom
Water is only lukewarm, never reaches normal hot temperature on the Gledhill water heater.
Under-Temperature / Partial Heating Fault
Symptom
Water leaking from around the top or side of a Gledhill cylinder.
Cylinder Shell or Fitting Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Gledhill thermal store / unvented water heater shows E01 and will not heat water.
|
Flow Temperature Sensor Fault | View Details |
| E02 |
Display shows E02, and water temperature is erratic or the unit shuts down.
|
Return Temperature Sensor Fault | View Details |
| E03 |
Gledhill water heater displays E03 and does not call for heat from the boiler or immersion.
|
Cylinder Thermistor / Store Temperature Sensor Fault | View Details |
| E04 |
E04 displayed and the unit will not operate; sometimes accompanied by a tripped safety thermostat.
|
Overheat Thermostat / High Limit Cut‑out Tripped | View Details |
| E05 |
E05 on display, no hot water, and the boiler does not fire when the cylinder is cold.
|
Flow Switch / Flow Sensor Fault (Primary or DHW) | View Details |
| E06 |
E06 displayed, the boiler runs but the store temperature does not rise correctly, or the unit locks out.
|
Primary Pump Fault / No Circulation | View Details |
| E07 |
E07 error and the boiler fails to fire when the store is cold.
|
Boiler Enable / Call for Heat Circuit Fault | View Details |
| E08 |
E08 displayed, and the immersion heater does not operate even when selected.
|
Immersion Heater Circuit Fault | View Details |
| E09 |
E09 on display, and the unit intermittently shuts down or resets.
|
Supply Voltage / Power Input Fault | View Details |
| E10 |
E10 displayed, no hot water, and the cold mains pressure appears normal.
|
Pressure / Flow Sensor Fault (Mains Inlet) | View Details |
| E11 |
E11 error, the unit will not start, sometimes accompanied by buzzing from the PCB area.
|
Relay / Output Driver Fault | View Details |
| E12 |
E12 displayed, and the hot water temperature overshoots or is too low despite sensor replacement.
|
Calibration / Sensor Range Error | View Details |
| E13 |
E13 error, unit locks out after running for a short period.
|
Store Overheat Detected by Sensor | View Details |
| E14 |
E14 displayed, no hot water, expansion vessel may be waterlogged.
|
Expansion / Pressure Control Fault | View Details |
| E15 |
E15 error, unit indicates low pressure or no water, may not fill correctly.
|
Low Water Level / Dry-Fire Protection Fault | View Details |
| E16 |
E16 displayed, unit reports a sensor short circuit.
|
NTC Sensor Short-Circuit Detected | View Details |
| E17 |
E17 displayed, unit reports a sensor open circuit.
|
NTC Sensor Open-Circuit Detected | View Details |
| E18 |
E18 error, unit indicates a communication fault between the display and main board.
|
Display / Interface Communication Error | View Details |
| E19 |
E19 displayed, unit fails self-test at power-up.
|
Internal Self-Test / Firmware Error | View Details |
| E20 |
E20 error, unit indicates pump overrun or that it is stuck on.
|
Pump Overrun / Feedback Fault | View Details |
| – |
Gledhill cylinder shows signs of corrosion around fittings or at the base.
|
Corrosion / Potential Cylinder Failure | View Details |
| – |
Gledhill thermal store boiler runs continuously and the store overheats.
|
Boiler Control Stuck On | View Details |
| – |
Gledhill thermal store pump runs but radiators or hot water do not heat properly.
|
Poor Primary Circulation / Balancing Issue | View Details |
| – |
Gledhill unit emits a burning smell or shows signs of scorching near electrical components.
|
Overheating Electrical Component | View Details |
| – |
Gledhill unit makes a constant running noise even when there is no demand for hot water or heating.
|
Pump or Fan Running Continuously | View Details |
| – |
Gledhill unit trips the RCD or MCB when heating starts.
|
Electrical Short or Earth Leakage | View Details |
| – |
Gledhill unit’s display works, but buttons or controls do not respond.
|
User Interface / Keypad Failure | View Details |
| – |
Gledhill water heater completely dead, no lights or display.
|
No Power / Dead Appliance | View Details |
| – |
Gledhill water heater frequently cycles on and off, causing temperature swings and wear.
|
Short Cycling / Control Hysteresis Issue | View Details |
| – |
Hot water runs hot then quickly goes cold during a shower on a Gledhill mains-pressure unit.
|
Hot Water Temperature Fluctuation / Flow Control Issue | View Details |
| – |
Hot water temperature at taps is dangerously high from a Gledhill cylinder.
|
Over-Temperature at Outlets | View Details |
| – |
No hot water at taps; Gledhill thermal store or unvented cylinder appears powered, but water remains cold.
|
No Heat Generation / Heat Source Not Operating | View Details |
| – |
Noisy operation from Gledhill water heater, including humming, banging, or gurgling sounds.
|
Hydraulic Noise / Air and Scale Issues | View Details |
| – |
Very low hot water pressure or flow from Gledhill mains-pressure cylinder.
|
Reduced Hot Water Flow | View Details |
| – |
Water dripping from the tundish on a Gledhill unvented cylinder.
|
Pressure Relief Valve Discharge | View Details |
| – |
Water is only lukewarm, never reaches normal hot temperature on the Gledhill water heater.
|
Under-Temperature / Partial Heating Fault | View Details |
| – |
Water leaking from around the top or side of a Gledhill cylinder.
|
Cylinder Shell or Fitting Leak | View Details |
No matching codes found
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