Warmhaus Enerwa / Priwa Fault codes & diagnostics

43 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural GasLPG 24-42 kW 2018-present
GC Numbers 47-313-0147-313-0247-313-0347-313-0447-313-0547-313-0647-313-07

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Severity at a glance

Each cell = one fault code. Hover to identify.
1 Emergency 38 High 4 Medium
Just want the most common Warmhaus Enerwa / Priwa faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 43 documented codes

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E03

Your boiler has too much water in the system, causing it to shut down to prevent damage from excessive pressure.

High DIY-safe £100-220

What to check first

  1. Check that the filling loop valves are fully closed
  2. Bleed water from a radiator using a bleed key to reduce pressure
  3. Monitor the pressure gauge to ensure it returns to between 1.0 and 1.5 bar
  4. Reset the boiler once the pressure is stabilised

Parts commonly replaced

  • Pressure relief valve
  • Expansion vessel
  • Filling loop

Related codes

Full explanation for E03
E04

Your boiler has lost the ability to measure the temperature of your tap water, meaning you will likely have no hot water until the sensor is fixed.

High Engineer only £90-210

Parts commonly replaced

  • DHW NTC Temperature Sensor
  • Main PCB (Electronic Card)

Related codes

Full explanation for E04
E05

Your boiler has lost its connection to the sensor that monitors the heating temperature, causing the system to stop running to prevent damage.

High Engineer only £90-180

Parts commonly replaced

  • NTC Heating Sensor
  • Wiring Harness
  • Main Circuit Board (PCB)

Related codes

Full explanation for E05
E10

Your boiler has detected a fault with an auxiliary temperature sensor, which means the system cannot accurately monitor the heat levels in certain parts of the unit.

High Engineer only £90-180

Parts commonly replaced

  • AUX temperature sensor
  • Wiring harness
  • Main PCB

Related codes

Full explanation for E10
E11

Your boiler is unable to control the gas flow properly because of a communication fault between its brain and the gas valve.

High Engineer only £180-£350

Parts commonly replaced

  • Gas Valve
  • Wiring Harness
  • Main Control Board (PCB)
Full explanation for E11
E13

Your boiler has shut down because the internal exhaust gases have reached a dangerously high temperature, triggered by a safety sensor.

High Engineer only £120-280

Parts commonly replaced

  • Exhaust gas temperature sensor (NTC)
  • Main heat exchanger cleaning
  • Flue assembly components

Related codes

Full explanation for E13
E14

Your boiler has detected that the sensor monitoring the temperature of the exhaust fumes is sending an incorrect signal or has failed.

High Engineer only £120-£220

Parts commonly replaced

  • Exhaust gas temperature sensor (Flue NTC)
  • Wiring harness
  • Main printed circuit board (PCB)

Related codes

Full explanation for E14
E15

Your boiler has detected a problem with the fan that clears exhaust gases, preventing the unit from starting safely.

High Engineer only £180-350

Parts commonly replaced

  • Fan assembly
  • Printed Circuit Board (PCB)
  • Air pressure switch

Related codes

Full explanation for E15
E16

Your boiler has detected a fault with a secondary temperature sensor that monitors water returning to the unit, causing it to stop operating for safety.

High Engineer only £120-220

Parts commonly replaced

  • AUX return temperature sensor (NTC)
  • Wiring harness
  • Control board

Related codes

Full explanation for E16
E17

Your boiler has detected that water is not moving through the system correctly, causing a temperature imbalance that has shut the unit down for safety.

High DIY-safe £120-350

What to check first

  1. Check that your boiler pressure is between 1.0 and 1.5 bar on the gauge.
  2. Ensure all radiator valves and isolation valves under the boiler are fully open.
  3. Gently bleed your radiators to remove any trapped air pockets.
  4. Reset the boiler by pressing the 'R' or Reset button.

Parts commonly replaced

  • Central heating pump
  • NTC thermistor sensors
  • Main heat exchanger (flushing/cleaning)

Related codes

Full explanation for E17
Showing 11–20 of 43
E19

Your boiler has detected that water is not moving through the system correctly, causing a temperature imbalance that has shut the unit down for safety.

High DIY-safe £120-350

What to check first

  1. Check that your boiler pressure is between 1.0 and 1.5 bar on the gauge.
  2. Ensure all radiator valves and isolation valves under the boiler are fully open.
  3. Gently bleed your radiators to remove any trapped air pockets.
  4. Reset the boiler by pressing the 'R' or Reset button.

Parts commonly replaced

  • Central heating pump
  • NTC thermistor sensors
  • Main heat exchanger (flushing/cleaning)

Related codes

Full explanation for E19
E37

Your boiler has detected that the electrical supply coming into the unit is too weak for it to run safely.

High Engineer only £100-350

Parts commonly replaced

  • PCB (Main Control Board)
  • Transformer
  • Power Supply Unit
Full explanation for E37
E40

Your boiler has detected an issue with the stability of the electrical power supply coming into your home.

High DIY-safe £90-350

What to check first

  1. Turn the boiler off using the power button or at the fused spur switch
  2. Wait for 60 seconds
  3. Turn the power back on and check if the code clears as the local grid stabilizes

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Voltage Stabiliser (external)
Full explanation for E40
E42

One of the buttons on your boiler's control panel has become stuck or is malfunctioning, preventing you from changing settings.

Medium DIY-safe £90-220

What to check first

  1. Check if any of the buttons on the front panel are physically stuck or pressed in.
  2. Gently press and release each button several times to see if they click back into place.
  3. Switch the boiler off at the fused spur switch, wait 30 seconds, and turn it back on to reset the display.

Parts commonly replaced

  • Control Interface/Display PCB
  • Control Panel Buttons

Related codes

Full explanation for E42
E43

Your boiler has lost its connection to your room thermostat, meaning it cannot receive instructions on when to turn the heating on.

High DIY-safe £60-250

What to check first

  1. Check if your wireless thermostat needs new batteries.
  2. Ensure the thermostat is within range of the boiler and there are no new obstructions.
  3. Check that the thermostat's receiver unit is powered on and plugged in correctly.

Parts commonly replaced

  • Thermostat batteries
  • Room thermostat transmitter
  • Wireless receiver
  • Communication wiring

Related codes

Full explanation for E43
E62

Your boiler has lost its settings and doesn't know how to burn gas efficiently, so it has shut down as a safety precaution.

High Engineer only £100-£280

Parts commonly replaced

  • Main PCB (Control Board)
  • Gas Valve
Full explanation for E62
E74

Your boiler has stopped working because it cannot correctly measure the temperature of the water inside the system.

High Engineer only £90-160

Parts commonly replaced

  • NTC Temperature Sensor
  • Wiring Loom

Related codes

Full explanation for E74
E77

Your boiler has detected an issue with its internal combustion levels and cannot regulate the gas flame safely.

High DIY-safe £180-450

What to check first

  1. Press the reset button once to see if the error clears
  2. Check that your gas supply is active and other gas appliances are working
  3. If the fault persists after one reset, turn off the boiler and call a Gas Safe engineer

Parts commonly replaced

  • Gas Valve
  • Main Printed Circuit Board (PCB)

Related codes

Full explanation for E77
E78

Your boiler has reached its safety limit for monitoring the gas flame and cannot adjust itself correctly to heat your home.

High DIY-safe £120-£350

What to check first

  1. Press and hold the reset button for 3 seconds
  2. Ensure your gas meter has credit (if applicable)
  3. Check that other gas appliances in your home are working correctly

Parts commonly replaced

  • Gas Valve
  • Main Printed Circuit Board (PCB)
  • Ionisation Electrode

Related codes

Full explanation for E78
E79

Your boiler is struggling to maintain its lowest flame setting, which is preventing it from running safely and efficiently.

High Engineer only £120-350

Parts commonly replaced

  • Gas Valve
  • Printed Circuit Board (PCB)
  • Electrode

Related codes

Full explanation for E79
Showing 21–30 of 43
E83

Your boiler has detected an inconsistent flame, which is often caused by a temporary interruption in the gas supply or a slight blockage in the air vent.

High DIY-safe £90-250

What to check first

  1. Press the Reset button on the control panel to clear the temporary fault
  2. Check if other gas appliances, like a hob, are working to ensure gas is being supplied
  3. Inspect the external flue pipe to ensure it is not obstructed by leaves or debris

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Ionisation Probe

Related codes

Full explanation for E83
E84

Your boiler is slowing down its performance because it has detected that the gas pressure coming into the unit is too low to run at full power.

Medium DIY-safe £80-200

What to check first

  1. Check that your gas emergency control valve (next to your meter) is fully open
  2. If you have a pre-payment meter, check that you have sufficient credit
  3. Check if other gas appliances, like a hob, are working correctly to rule out a grid supply issue

Parts commonly replaced

  • Gas Valve
  • Gas Pressure Regulator

Related codes

Full explanation for E84
E89

Your boiler has stopped working because it cannot detect a stable flame, often due to a problem with the gas supply or a faulty internal sensor.

High Engineer only £120-£350

Parts commonly replaced

  • Gas valve
  • Ionisation electrode
  • PCB
  • Gas pressure regulator

Related codes

Full explanation for E89
E90

Your boiler has detected an issue with how it mixes fuel and air for combustion, meaning it cannot operate safely or efficiently.

High Engineer only £180-450

Parts commonly replaced

  • Main PCB (Control Board)
  • Gas Valve
  • Electrode

Related codes

Full explanation for E90
E92

Your boiler has detected that wind or air pressure outside is affecting the way the gas burns, and it needs a professional check to ensure it is operating safely.

Medium Engineer only £90-180

Parts commonly replaced

  • Flue seals
  • Flue terminal
  • Gas valve

Related codes

Full explanation for E92
E93

Your boiler is struggling to control its flame correctly and has shut down as a safety precaution.

High Engineer only £120-450

Parts commonly replaced

  • Gas valve
  • Main PCB (Control Board)
  • Venturi or Mixer unit

Related codes

Full explanation for E93
E94

Your boiler is struggling to maintain a steady flame because it either isn't receiving enough gas or it is drawing in its own exhaust fumes.

High Engineer only £120-350

Parts commonly replaced

  • Gas Valve
  • PCB
  • Flue Seals
  • Gas Meter Regulator

Related codes

Full explanation for E94
E95

Your boiler is struggling to maintain a steady flame, which is likely caused by a loose connection or a dirty component inside the burner unit.

High Engineer only £90-180

Parts commonly replaced

  • Ignition electrode
  • Flame sensing electrode
  • Ionisation lead

Related codes

Full explanation for E95
E96

Your boiler has detected an issue with how exhaust gases are leaving the flue or a problem with the air-fuel mixture, causing it to shut down for safety.

High Engineer only £100-250

Parts commonly replaced

  • Flue seals
  • Gas valve
  • Electrode set

Related codes

Full explanation for E96
rE02

Your boiler has detected that the water pressure in the system is too low or the pressure sensor settings are incorrect, causing the unit to stop working.

High DIY-safe £0-120

What to check first

  1. Check the pressure gauge; it should ideally be between 1.0 and 1.5 bar.
  2. Locate the filling loop (usually a silver flexible hose) under the boiler.
  3. Open both valves slowly to allow water into the system until the gauge reaches 1.2 bar, then close them tightly.

Parts commonly replaced

  • Water pressure sensor
  • Filling loop hose
  • Expansion vessel

Related codes

Full explanation for rE02
Showing 31–40 of 43
rE06

Your boiler is not starting because it cannot light the gas flame needed to heat your water.

High DIY-safe £100-£250

What to check first

  1. Check that your gas emergency control valve (lever) is in the 'on' position.
  2. If you have a prepay gas meter, ensure you have sufficient credit.
  3. Check if other gas appliances in your home, like a hob, are working correctly.
  4. Press and hold the 'R' or reset button to see if the boiler restarts.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Spark Generator

Related codes

Full explanation for rE06
rE07

Your boiler has shut down because it has detected that the water inside has become dangerously hot.

High DIY-safe £120-350

What to check first

  1. Check that your radiator valves are open to allow water to flow.
  2. Ensure your system water pressure is between 1.0 and 1.5 bar.
  3. Press and hold the 'R' or Reset button for a few seconds to restart the boiler.

Parts commonly replaced

  • Overheat Thermostat
  • Circulation Pump
  • Main Heat Exchanger

Related codes

Full explanation for rE07
rE08

Your boiler is not starting because it cannot light the gas flame needed to heat your water.

High DIY-safe £100-£250

What to check first

  1. Check that your gas emergency control valve (lever) is in the 'on' position.
  2. If you have a prepay gas meter, ensure you have sufficient credit.
  3. Check if other gas appliances in your home, like a hob, are working correctly.
  4. Press and hold the 'R' or reset button to see if the boiler restarts.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Spark Generator

Related codes

Full explanation for rE08
rE28

Your boiler has been reset too many times in a short period and has temporarily locked itself to prevent damage.

Medium DIY-safe £0-120

What to check first

  1. Wait for 60 minutes without touching the boiler to allow the internal timer to clear.
  2. Check that your gas pre-pay meter (if applicable) has credit.
  3. Ensure any external gas valves are open and that other gas appliances are working.
  4. After the hour has passed, perform one single reset to see if the boiler fires up.

Parts commonly replaced

  • Ignition Electrode
  • Gas Valve
  • Flame Sensing Probe
Full explanation for rE28
rE41

Your boiler is attempting to light but cannot maintain a flame, meaning it has safely shut down to prevent issues.

High DIY-safe £100-280

What to check first

  1. Check that your gas emergency control valve is in the 'on' position
  2. If you have a pre-payment meter, ensure you have sufficient credit
  3. Check if other gas appliances in your home, like a hob, are working correctly
  4. Press and hold the 'R' (Reset) button for 3 seconds

Parts commonly replaced

  • Ignition electrode
  • Ionisation probe
  • Gas valve
  • Printed Circuit Board (PCB)
Full explanation for rE41
rE44

Your boiler is struggling to ignite the gas properly and has locked itself out for safety after several failed attempts.

High DIY-safe £120-350

What to check first

  1. Check that your gas emergency control valve is open and you have credit on your gas meter
  2. Press and hold the 'R' or 'Reset' button on the boiler control panel for 3 seconds
  3. Wait for the boiler to complete its restart sequence to see if the flame generates

Parts commonly replaced

  • Gas valve
  • Ignition electrode
  • Printed Circuit Board (PCB)
Full explanation for rE44
rE72

Your boiler is failing to light the flame, which means you will not have any heating or hot water until it is reset or repaired.

High DIY-safe £100-280

What to check first

  1. Check that your gas emergency control valve and any internal gas lever valves are fully open
  2. Inspect the flue terminal outside to ensure it is not blocked by leaves or debris
  3. Press and hold the 'Reset' button for 3 seconds to attempt a restart

Parts commonly replaced

  • Gas Valve
  • Ignition Electrode
  • Flue Pressure Switch

Related codes

Full explanation for rE72
rE80

Your boiler has stopped working because its internal computer is unable to communicate with its gas control system.

High Engineer only £250-450

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Gas Valve

Related codes

Full explanation for rE80
rE81

Your boiler is failing to light the flame after multiple attempts, which is often caused by an issue with the air supply or exhaust gases leaving the building.

High Engineer only £100-£250

Parts commonly replaced

  • Flue seals
  • Chimney gaskets
  • Ignition electrode
  • Flue fan

Related codes

Full explanation for rE81
rE82

Your boiler has detected a problem with the exhaust system or air supply, preventing it from safely burning gas.

Emergency Engineer only £120-280

Parts commonly replaced

  • Flue gasket
  • Flue ducting
  • Venturi tube
  • Burner seal

Related codes

Full explanation for rE82
Showing 41–43 of 43
rE88

Your boiler is struggling to manage the flow of gas correctly and has shut down as a safety precaution.

High Engineer only £180-350

Parts commonly replaced

  • Gas valve
  • Main PCB
  • Wiring harness

Related codes

Full explanation for rE88
rE98

Your boiler's main internal computer has encountered a startup failure and cannot control the heating process.

High DIY-safe £180-350

What to check first

  1. Locate the Reset button on the control panel
  2. Press and hold the Reset button for 3 to 5 seconds
  3. Wait for the boiler to complete its restart sequence

Parts commonly replaced

  • Main PCB (Printed Circuit Board)
  • Wiring Loom

Related codes

Full explanation for rE98
rE99

Your boiler has encountered a general electronic system error and needs to be restarted to clear its memory.

High DIY-safe £80-350

What to check first

  1. Locate the 'Reset' button on the boiler control panel.
  2. Press and hold the button for 2-3 seconds until the display changes.
  3. Wait for the boiler to complete its startup sequence to see if the heating resumes.

Parts commonly replaced

  • Main Printed Circuit Board (PCB)
  • Display Interface

Related codes

Full explanation for rE99