Intergas is a Dutch heating company founded in 1964, known for producing innovative, highly reliable boilers with a simplified single heat exchanger design. The Intergas HRE and Rapid ranges are popular in the UK, particularly for social housing. Intergas fault codes are displayed as two-digit hex/decimal codes.
Intergas Boiler Fault Codes
All Intergas Fault Codes 48
| Code | Fault | Severity | Type | View guide |
|---|---|---|---|---|
| 0.0 | Low System Pressure (Standard Range) On standard Intergas HRE boilers, 0.0 indicates the system water pressure is too low to… | Low | DIY Check | View Guide |
| 1 | Temperature Too High (Standard Range) On standard Intergas HRE boilers, code 1 indicates the water temperature has exceeded the safe… | High | Engineer | View Guide |
| 4 | No Flame Signal (Standard Range) On standard Intergas HRE boilers, code 4 indicates no flame was detected during the ignition… | Medium | DIY Check | View Guide |
| 8 | Incorrect Fan Speed (Standard Range) On standard Intergas HRE boilers, code 8 indicates the fan is not running at the… | High | Engineer | View Guide |
| E1 | Ignition Failure The boiler failed to ignite. | High | Engineer | View Guide |
| E10 | False Flame Detected The boiler's ionisation circuit has detected a flame signal when the gas valve should be… | High | Engineer | View Guide |
| E11 | PCB / Electronics Fault The main PCB has detected an internal fault. Intergas boilers display E11 for various electronic… | High | Engineer | View Guide |
| E12 | Pressure Sensor Fault Electronic pressure sensor faulty. | Medium | Engineer | View Guide |
| E13 | Gas Valve Fault The gas valve has a fault — it may not be opening or closing correctly,… | High | Engineer | View Guide |
| E14 | Flue Temperature Sensor Fault The flue gas temperature sensor has failed or has a wiring fault. | Medium | Engineer | View Guide |
| E15 | Gas Valve Fault Gas valve not responding. | High | Engineer | View Guide |
| E16 | Maximum Resets Exceeded The boiler has exceeded its maximum number of consecutive resets. It will not restart until… | High | Engineer | View Guide |
| E17 | Condensate Pump Fault On Intergas models fitted with a condensate pump, E17 indicates the pump has a fault… | Medium | Engineer | View Guide |
| E18 | PCB Fault Internal PCB error. | High | Engineer | View Guide |
| E19 | DHW Sensor Fault The hot water NTC sensor is faulty. | Medium | Engineer | View Guide |
| E2 | Ignition Failure / Lockout The most common Intergas fault code. The boiler has failed to ignite or has lost… | Medium | DIY Check | View Guide |
| E20 | DHW Flow Rate Fault The domestic hot water flow rate is outside the expected range — either too low… | Medium | Engineer | View Guide |
| E21 | Flow Sensor Open Circuit Flow NTC circuit broken. | Medium | Engineer | View Guide |
| E22 | Return Sensor Open Circuit Return NTC circuit broken. | Medium | Engineer | View Guide |
| E23 | Condensate Blocked Condensate drain blocked or frozen. | Medium | DIY Check | View Guide |
| E24 | Pump Fault Pump not running. | High | Engineer | View Guide |
| E25 | Diverter Valve Fault Valve stuck. | Medium | Engineer | View Guide |
| E26 | Air Pressure Switch Fault APS not detecting airflow. | High | Engineer | View Guide |
| E3 | Flame Lost Flame lost during operation. | High | Engineer | View Guide |
| E4 | Overheat Protection Safety thermostat triggered. | High | Engineer | View Guide |
| E5 | Overheat Lockout The boiler's overtemperature protection has activated. On Intergas boilers this typically means the heat exchanger… | High | Engineer | View Guide |
| E6 | Fan Fault / Air Pressure Switch The fan is not confirming correct operation via the air pressure switch before ignition is… | High | Engineer | View Guide |
| E7 | Water Pressure Too Low System water pressure is below the safe operating minimum for the boiler. | Low | DIY Check | View Guide |
| E8 | Fan Fault Fan not running correctly. | High | Engineer | View Guide |
| E9 | Flow/Return Temperature Sensor Fault A flow or return NTC temperature sensor has failed or has a wiring fault on… | Medium | Engineer | View Guide |
| F000 | Heat Exchanger Sensor Fault (Xtreme/Xclusive) On Intergas Xtreme and Xclusive boilers, F000 indicates a heat exchanger sensor defect requiring replacement. | Medium | Engineer | View Guide |
| F001 | Overtemperature During CH Demand (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F001 indicates the temperature has exceeded safe limits during a central heating… | High | Engineer | View Guide |
| F002 | Flame Supervision Flame signal problem. | High | Engineer | View Guide |
| F003 | Overheat Boiler exceeded safe temperature. | High | Engineer | View Guide |
| F004 | No Flame During Startup (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F004 indicates no flame was detected during the ignition sequence. Gas valve… | Medium | DIY Check | View Guide |
| F005 | Flame Loss During Operation (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F005 means the flame has been lost during normal operation. Possible condensate… | Medium | DIY Check | View Guide |
| F006 | False Flame Signal (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F006 indicates a flame simulation error — a flame is being detected… | High | Engineer | View Guide |
| F007 | Ionisation Fault No flame detected. | High | Engineer | View Guide |
| F008 | Incorrect Fan Speed (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F008 indicates the fan is not running at the correct speed. Fan… | High | Engineer | View Guide |
| F009 | Gas Valve Gas valve fault. | High | Engineer | View Guide |
| F010 | Low Pressure System pressure too low. | Low | DIY Check | View Guide |
| F011 | Fan Speed Fan out of range. | High | Engineer | View Guide |
| F012 | NTC Fault Temperature sensor fault. | Medium | Engineer | View Guide |
| F013 | PCB Error PCB fault. | High | Engineer | View Guide |
| F015 | Condensate Condensate blocked. | Medium | DIY Check | View Guide |
| F018 | Flue or Air Supply Blocked (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F018 indicates the flue and/or air supply duct is blocked. Check for… | High | DIY Check | View Guide |
| F020 | Pump Pump fault. | High | Engineer | View Guide |
| F029 | Gas Valve Fault (Xtreme/Xclusive) On Intergas Xtreme/Xclusive, F029 indicates a gas valve fault — possible leakage or burner controller… | High | Engineer | View Guide |