Heating advice
Boiler fault code finder
Search by manufacturer, model or the code shown on your boiler. We’ll explain what it means, what you can safely check, and when to call an engineer.
- 367
- fault codes
- 13
- brands
- 24/7
- local help
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check whether another gas appliance works and whether a prepayment meter has credit.
- In freezing weather, visually check an accessible external condensate pipe for ice and follow the manufacturer's thawing guidance if applicable.
- Reset once only if the user manual permits it. If the code returns, arrange an engineer.
How an engineer may resolve it
Test the gas supply and inlet pressure, ignition and ionisation components, condensate route, flue, gas valve and combustion settings; repair or replace the failed component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check the system pressure and make sure accessible radiator valves are open.
- Allow an overheated boiler to cool and reset once only if the user manual permits it.
- If the fault returns, stop resetting and arrange an engineer.
How an engineer may resolve it
Diagnose water circulation, air locks, pump operation, valves, bypass, blockages, heat exchanger and temperature sensors; restore correct flow and test the safety controls.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not remove the boiler case or interfere with the flue.
- If the manual identifies a frozen external condensate pipe as a possible cause, follow only the manufacturer's external thawing instructions.
- Otherwise switch the boiler off and arrange a Gas Safe registered engineer.
How an engineer may resolve it
Inspect the flue and air path, condensate system, burner, fan or Venturi, sensors and combustion readings; clear, repair, adjust or replace as the appliance instructions require.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not keep resetting the boiler or open its case.
- Arrange a Gas Safe registered engineer.
- If you smell gas, leave the property and call the National Gas Emergency Service on 0800 111 999 from outside.
How an engineer may resolve it
Isolate and test the gas valve circuit, valve tightness, ignition or flame-sensing system and control board; repair or replace components and complete required gas-safety checks.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- No internal homeowner repair is safe for this fault.
- A single reset may be tried only where the model's user manual allows it.
- Arrange an engineer if the code remains or returns.
How an engineer may resolve it
Test the relevant sensor or thermistor, its position, resistance, plug and wiring; repair the connection or replace the failed sensor and verify operation.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- No internal homeowner repair is safe for this fault.
- A single reset may be tried only where the model's user manual allows it.
- Arrange an engineer if the code remains or returns.
How an engineer may resolve it
Test the relevant sensor or thermistor, its position, resistance, plug and wiring; repair the connection or replace the failed sensor and verify operation.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not remove the boiler case.
- Record the full code and model, then arrange a Gas Safe registered engineer.
How an engineer may resolve it
Follow the model-specific fault-finding procedure, test the indicated circuit or component, repair the cause and recommission the appliance.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check the pressure gauge with the system cold.
- If it is below the range stated in the boiler manual, repressurise only by following that model's user instructions.
- Stop and book an engineer if pressure drops again, rises excessively, or there is a visible leak.
How an engineer may resolve it
Check for leaks, trapped air, the pressure sensor, pump and expansion vessel; repair the underlying fault before recommissioning.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- No internal homeowner repair is safe for this fault.
- A single reset may be tried only where the model's user manual allows it.
- Arrange an engineer if the code remains or returns.
How an engineer may resolve it
Test the relevant sensor or thermistor, its position, resistance, plug and wiring; repair the connection or replace the failed sensor and verify operation.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Power-cycle or reset once only if the user manual specifically permits it.
- If the message remains, arrange an engineer.
How an engineer may resolve it
Check configuration, coding, communication buses, plugs, wiring, power supply and control boards; configure, repair or replace the failed control component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not open the case or inspect the fan or flue yourself.
- Arrange a Gas Safe registered engineer.
How an engineer may resolve it
Check fan movement and speed feedback, wiring and connectors, air/flue restrictions and the control board; repair or replace the defective part and verify combustion.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check whether another gas appliance works and whether a prepayment meter has credit.
- In freezing weather, visually check an accessible external condensate pipe for ice and follow the manufacturer's thawing guidance if applicable.
- Reset once only if the user manual permits it. If the code returns, arrange an engineer.
How an engineer may resolve it
Test the gas supply and inlet pressure, ignition and ionisation components, condensate route, flue, gas valve and combustion settings; repair or replace the failed component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Power-cycle or reset once only if the user manual specifically permits it.
- If the message remains, arrange an engineer.
How an engineer may resolve it
Check configuration, coding, communication buses, plugs, wiring, power supply and control boards; configure, repair or replace the failed control component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- No internal homeowner repair is safe for this fault.
- A single reset may be tried only where the model's user manual allows it.
- Arrange an engineer if the code remains or returns.
How an engineer may resolve it
Test the relevant sensor or thermistor, its position, resistance, plug and wiring; repair the connection or replace the failed sensor and verify operation.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not remove the boiler case.
- Record the full code and model, then arrange a Gas Safe registered engineer.
How an engineer may resolve it
Follow the model-specific fault-finding procedure, test the indicated circuit or component, repair the cause and recommission the appliance.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Power-cycle or reset once only if the user manual specifically permits it.
- If the message remains, arrange an engineer.
How an engineer may resolve it
Check configuration, coding, communication buses, plugs, wiring, power supply and control boards; configure, repair or replace the failed control component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check the system pressure and make sure accessible radiator valves are open.
- Allow an overheated boiler to cool and reset once only if the user manual permits it.
- If the fault returns, stop resetting and arrange an engineer.
How an engineer may resolve it
Diagnose water circulation, air locks, pump operation, valves, bypass, blockages, heat exchanger and temperature sensors; restore correct flow and test the safety controls.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not remove the boiler case or interfere with the flue.
- If the manual identifies a frozen external condensate pipe as a possible cause, follow only the manufacturer's external thawing instructions.
- Otherwise switch the boiler off and arrange a Gas Safe registered engineer.
How an engineer may resolve it
Inspect the flue and air path, condensate system, burner, fan or Venturi, sensors and combustion readings; clear, repair, adjust or replace as the appliance instructions require.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Power-cycle or reset once only if the user manual specifically permits it.
- If the message remains, arrange an engineer.
How an engineer may resolve it
Check configuration, coding, communication buses, plugs, wiring, power supply and control boards; configure, repair or replace the failed control component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check for a wider power cut or a tripped consumer-unit circuit without removing the boiler case.
- Use a qualified electrician or Gas Safe engineer for further diagnosis.
How an engineer may resolve it
Verify supply voltage, polarity, earthing, fuses, harnesses and appliance electronics; correct the electrical supply or replace the failed component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check whether another gas appliance works and whether a prepayment meter has credit.
- In freezing weather, visually check an accessible external condensate pipe for ice and follow the manufacturer's thawing guidance if applicable.
- Reset once only if the user manual permits it. If the code returns, arrange an engineer.
How an engineer may resolve it
Test the gas supply and inlet pressure, ignition and ionisation components, condensate route, flue, gas valve and combustion settings; repair or replace the failed component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check whether another gas appliance works and whether a prepayment meter has credit.
- In freezing weather, visually check an accessible external condensate pipe for ice and follow the manufacturer's thawing guidance if applicable.
- Reset once only if the user manual permits it. If the code returns, arrange an engineer.
How an engineer may resolve it
Test the gas supply and inlet pressure, ignition and ionisation components, condensate route, flue, gas valve and combustion settings; repair or replace the failed component.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Check the system pressure and make sure accessible radiator valves are open.
- Allow an overheated boiler to cool and reset once only if the user manual permits it.
- If the fault returns, stop resetting and arrange an engineer.
How an engineer may resolve it
Diagnose water circulation, air locks, pump operation, valves, bypass, blockages, heat exchanger and temperature sensors; restore correct flow and test the safety controls.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
E-Tec Plus
Models: E-Tec Plus 28, E-Tec Plus 33, E-Tec Plus 38
Open full fault-code pageWhat to do
Safe checks
- Do not remove the boiler case or interfere with the flue.
- If the manual identifies a frozen external condensate pipe as a possible cause, follow only the manufacturer's external thawing instructions.
- Otherwise switch the boiler off and arrange a Gas Safe registered engineer.
How an engineer may resolve it
Inspect the flue and air path, condensate system, burner, fan or Venturi, sensors and combustion readings; clear, repair, adjust or replace as the appliance instructions require.
Source: Alpha Heating Innovation — E-Tec Plus Installation and Servicing Instructions (01/22) · checked 15 Aug 2026
Fault-code meanings can vary by model and software version. The appliance manual and a competent engineer’s diagnosis take precedence. Never remove a boiler case or work on gas, combustion, flue or internal electrical components yourself.
