Vokera
Vokera 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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01
Vokera water heater locks out with code 01; the burner does not ignite, and the fan may start briefly then stop.
Ignition Failure / Flame Not Detected
02
Vokera water heater shows code 02; the burner shuts down shortly after ignition or fails to light, with a possible overheat indication.
Primary Heat Exchanger Overheat / Safety Thermostat Trip
03
Vokera water heater displays code 03; the fan runs but ignition does not occur, or the appliance locks out due to an air pressure fault.
Air Pressure Switch / Flue Fan Fault
04
Vokera water heater shows code 04; no hot water, and the appliance does not attempt to ignite when a tap is opened.
Domestic Hot Water Flow Detection Failure
05
Vokera water heater displays code 05; the unit shuts down or will not start, and the temperature reading appears abnormal.
NTC Temperature Sensor Fault (Flow or Return)
06
Vokera water heater shows code 06; the burner shuts down due to high temperature, frequent cycling, and possible kettling noises may occur.
Flow Temperature Too High / Poor Circulation
07
Vokera water heater displays code 07; the appliance fails to start or locks out due to a fan-related error.
Fan Speed / Fan Feedback Fault
08
Vokera water heater shows code 08; no ignition occurs, and the gas valve is not operating correctly.
Gas Valve Control / Modulation Fault
09
Vokera water heater displays code 09; the appliance locks out due to a flue or combustion safety fault.
Flue System / Combustion Safety Fault
10
Vokera water heater shows code 10; there is no hot water or heating, and the control panel is unresponsive or intermittent.
PCB / Control Board Fault
11
Vokera water heater displays code 11; the appliance fails to start after a power interruption or due to a software error.
Internal Software / Configuration Fault
12
Vokera water heater shows code 12; there is no hot water, and the appliance detects low water pressure or flow in the primary circuit.
Low System Pressure / Water Pressure Switch Fault
13
Vokera water heater displays code 13, the appliance shuts down due to flue over-temperature or a sensor fault.
Flue Temperature Sensor Fault / Overheat
14
Vokera water heater shows code 14, the appliance locks out due to a condensate or drainage-related fault.
Condensate Drain Blockage / Siphon Fault
15
Vokera water heater displays code 15, the appliance fails to detect the flame correctly, leading to intermittent hot water.
Flame Detection / Ionisation Fault
16
Vokera water heater shows code 16, the appliance shuts down due to a DHW temperature fault, and water may be excessively hot or cold.
DHW NTC Sensor Fault / DHW Overheat
17
Vokera water heater displays code 17, the appliance indicates a circulation or pump fault and may overheat quickly.
Circulation Pump Fault / No Flow
18
Vokera water heater shows code 18, the appliance indicates an expansion or pressure-related fault.
Expansion Vessel / Pressure Control Fault
19
Vokera water heater displays code 19, the appliance indicates a sensor short-circuit or a wiring fault.
Sensor Short-Circuit / Electrical Fault
20
Vokera water heater shows code 20, the appliance indicates a sensor open-circuit or disconnection.
Sensor Open-Circuit / Disconnected
Symptom
The water heater produces no hot water at any tap, the display is on, but the burner does not fire when a hot tap is opened.
DHW Demand Not Recognised
Symptom
The water heater provides hot water, but the temperature fluctuates between hot and cold during a shower.
Inconsistent DHW Temperature Control
Symptom
Water heater burner cycles on and off rapidly while a hot tap is open
Short Cycling on DHW
Symptom
Water heater burner runs, but hot water temperature is too low even at the maximum setting
Insufficient DHW Output Temperature
Symptom
Water heater causes RCD or fuse to trip when it attempts to start
Electrical Short / Earth Leakage
Symptom
Water heater does not power on at all; the display is blank
No Power to Appliance
Symptom
Water heater emits a burning smell or visible smoke from the casing
Electrical Overheating / Component Burnout
Symptom
Water heater emits a strong metallic or burning dust smell when first used after a long period off
Dust Burn-Off / Light Overheating
Symptom
Water heater fan runs continuously even when there is no demand for hot water
Fan Overrun / Control Fault
Symptom
Water heater flue terminal drips large amounts of water or stains the wall
Condensate / Flue Drainage Issue
Symptom
Water heater ignites but shuts down after a few seconds; hot water stops quickly
Flame Loss After Ignition
Symptom
Water heater is excessively noisy during operation (whining, grinding, or rattling)
Mechanical Noise from Fan or Pump
Symptom
Water heater is leaking from underneath the casing
Internal Water Leak
Symptom
Water heater makes loud banging or kettling noises when producing hot water
Heat Exchanger Kettling / Localized Boiling
Symptom
Water heater pressure gauge drops over time and requires frequent topping up
Chronic Pressure Loss
Symptom
Water heater’s hot water flow rate is significantly reduced compared to cold water flow
Restricted DHW Flow
Symptom
Water heater’s hot water is discoloured (brown or black) when first run
Corrosion / Debris in DHW Circuit
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 01 |
Vokera water heater locks out with code 01; the burner does not ignite, and the fan may start briefly then stop.
|
Ignition Failure / Flame Not Detected | View Details |
| 02 |
Vokera water heater shows code 02; the burner shuts down shortly after ignition or fails to light, with a possible overheat indication.
|
Primary Heat Exchanger Overheat / Safety Thermostat Trip | View Details |
| 03 |
Vokera water heater displays code 03; the fan runs but ignition does not occur, or the appliance locks out due to an air pressure fault.
|
Air Pressure Switch / Flue Fan Fault | View Details |
| 04 |
Vokera water heater shows code 04; no hot water, and the appliance does not attempt to ignite when a tap is opened.
|
Domestic Hot Water Flow Detection Failure | View Details |
| 05 |
Vokera water heater displays code 05; the unit shuts down or will not start, and the temperature reading appears abnormal.
|
NTC Temperature Sensor Fault (Flow or Return) | View Details |
| 06 |
Vokera water heater shows code 06; the burner shuts down due to high temperature, frequent cycling, and possible kettling noises may occur.
|
Flow Temperature Too High / Poor Circulation | View Details |
| 07 |
Vokera water heater displays code 07; the appliance fails to start or locks out due to a fan-related error.
|
Fan Speed / Fan Feedback Fault | View Details |
| 08 |
Vokera water heater shows code 08; no ignition occurs, and the gas valve is not operating correctly.
|
Gas Valve Control / Modulation Fault | View Details |
| 09 |
Vokera water heater displays code 09; the appliance locks out due to a flue or combustion safety fault.
|
Flue System / Combustion Safety Fault | View Details |
| 10 |
Vokera water heater shows code 10; there is no hot water or heating, and the control panel is unresponsive or intermittent.
|
PCB / Control Board Fault | View Details |
| 11 |
Vokera water heater displays code 11; the appliance fails to start after a power interruption or due to a software error.
|
Internal Software / Configuration Fault | View Details |
| 12 |
Vokera water heater shows code 12; there is no hot water, and the appliance detects low water pressure or flow in the primary circuit.
|
Low System Pressure / Water Pressure Switch Fault | View Details |
| 13 |
Vokera water heater displays code 13, the appliance shuts down due to flue over-temperature or a sensor fault.
|
Flue Temperature Sensor Fault / Overheat | View Details |
| 14 |
Vokera water heater shows code 14, the appliance locks out due to a condensate or drainage-related fault.
|
Condensate Drain Blockage / Siphon Fault | View Details |
| 15 |
Vokera water heater displays code 15, the appliance fails to detect the flame correctly, leading to intermittent hot water.
|
Flame Detection / Ionisation Fault | View Details |
| 16 |
Vokera water heater shows code 16, the appliance shuts down due to a DHW temperature fault, and water may be excessively hot or cold.
|
DHW NTC Sensor Fault / DHW Overheat | View Details |
| 17 |
Vokera water heater displays code 17, the appliance indicates a circulation or pump fault and may overheat quickly.
|
Circulation Pump Fault / No Flow | View Details |
| 18 |
Vokera water heater shows code 18, the appliance indicates an expansion or pressure-related fault.
|
Expansion Vessel / Pressure Control Fault | View Details |
| 19 |
Vokera water heater displays code 19, the appliance indicates a sensor short-circuit or a wiring fault.
|
Sensor Short-Circuit / Electrical Fault | View Details |
| 20 |
Vokera water heater shows code 20, the appliance indicates a sensor open-circuit or disconnection.
|
Sensor Open-Circuit / Disconnected | View Details |
| – |
The water heater produces no hot water at any tap, the display is on, but the burner does not fire when a hot tap is opened.
|
DHW Demand Not Recognised | View Details |
| – |
The water heater provides hot water, but the temperature fluctuates between hot and cold during a shower.
|
Inconsistent DHW Temperature Control | View Details |
| – |
Water heater burner cycles on and off rapidly while a hot tap is open
|
Short Cycling on DHW | View Details |
| – |
Water heater burner runs, but hot water temperature is too low even at the maximum setting
|
Insufficient DHW Output Temperature | View Details |
| – |
Water heater causes RCD or fuse to trip when it attempts to start
|
Electrical Short / Earth Leakage | View Details |
| – |
Water heater does not power on at all; the display is blank
|
No Power to Appliance | View Details |
| – |
Water heater emits a burning smell or visible smoke from the casing
|
Electrical Overheating / Component Burnout | View Details |
| – |
Water heater emits a strong metallic or burning dust smell when first used after a long period off
|
Dust Burn-Off / Light Overheating | View Details |
| – |
Water heater fan runs continuously even when there is no demand for hot water
|
Fan Overrun / Control Fault | View Details |
| – |
Water heater flue terminal drips large amounts of water or stains the wall
|
Condensate / Flue Drainage Issue | View Details |
| – |
Water heater ignites but shuts down after a few seconds; hot water stops quickly
|
Flame Loss After Ignition | View Details |
| – |
Water heater is excessively noisy during operation (whining, grinding, or rattling)
|
Mechanical Noise from Fan or Pump | View Details |
| – |
Water heater is leaking from underneath the casing
|
Internal Water Leak | View Details |
| – |
Water heater makes loud banging or kettling noises when producing hot water
|
Heat Exchanger Kettling / Localized Boiling | View Details |
| – |
Water heater pressure gauge drops over time and requires frequent topping up
|
Chronic Pressure Loss | View Details |
| – |
Water heater’s hot water flow rate is significantly reduced compared to cold water flow
|
Restricted DHW Flow | View Details |
| – |
Water heater’s hot water is discoloured (brown or black) when first run
|
Corrosion / Debris in DHW Circuit | View Details |
No matching codes found
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