ELCO error codes
Find the meaning of ELCO fault, warning and status codes, with model context, documented causes, safe checks and links to available manufacturer guidance.
43documented codes
2products and models
1product categories
About ELCO error codes
An error code is a diagnostic clue, not a complete repair diagnosis. ELCO may reuse similar-looking codes across different products, model generations or regions, so always confirm the complete code and exact model before following instructions or ordering parts.
This profile connects every indexed ELCO code to its dedicated explanation page. Each page is structured around the search intent: a quick meaning, symptoms, likely causes, safe troubleshooting, reset guidance, applicable products and the point at which professional help is appropriate. Records marked as verified include the manufacturer or another authoritative technical source.
Start with the code shown on the display, then narrow the result by product or model. Do not assume that a reset has repaired the underlying fault. If a code returns, the product is unsafe, or diagnosis requires internal electrical, gas, refrigerant or moving components, stop and use an authorised technician.
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Popular ELCO codes
433ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 433 error code – Primary heat-exchanger temperature too highELCO documents lockout code 433 for the TRIGON XXL as: Primary heat-exchanger temperature too high.432ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 432 error code – Functional earth not connectedELCO documents lockout code 432 for the TRIGON XXL as: Functional earth not connected.431ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 431 error code – Primary heat-exchanger sensor faultELCO documents lockout code 431 for the TRIGON XXL as: Primary heat-exchanger sensor fault.427ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 427 error code – Flue-gas damper configuration faultELCO documents lockout code 427 for the TRIGON XXL as: Flue-gas damper configuration fault.426ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 426 error code – Flue-gas damper feedback faultELCO documents lockout code 426 for the TRIGON XXL as: Flue-gas damper feedback fault.388ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 388 error code – Domestic-hot-water function errorELCO documents lockout code 388 for the TRIGON XXL as: Domestic-hot-water function error.386ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 386 error code – Fan speed outside the valid rangeELCO documents lockout code 386 for the TRIGON XXL as: Fan speed outside the valid range.373ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 373 error code – Extension module 3 collective errorELCO documents lockout code 373 for the TRIGON XXL as: Extension module 3 collective error.
ELCO product groups
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101ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 101 error code – Engine overheatELCO identifies 101 for the TRIGON L PLUS commercial condensing boiler as: Engine overheat.104ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 104 error code – Flow Check 2ELCO identifies 104 for the TRIGON L PLUS commercial condensing boiler as: Flow Check 2.107ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 107 error code – Flow Check 5ELCO identifies 107 for the TRIGON L PLUS commercial condensing boiler as: Flow Check 5.110ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 110 error code – Flow or send probe damagedELCO identifies 110 for the TRIGON L PLUS commercial condensing boiler as: Flow or send probe damaged.1P1ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 1P1 error code – Flow Check 1ELCO identifies 1P1 for the TRIGON L PLUS commercial condensing boiler as: Flow Check 1.1P2ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 1P2 error code – Flow Check 3ELCO identifies 1P2 for the TRIGON L PLUS commercial condensing boiler as: Flow Check 3.1P3ELCO · TRIGON L PLUS commercial condensing boiler · United Kingdom and EuropeELCO TRIGON L PLUS commercial condensing boiler 1P3 error code – Flow Check 4ELCO identifies 1P3 for the TRIGON L PLUS commercial condensing boiler as: Flow Check 4.328ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 328 error code – Mixing groups configured with the same functionELCO documents lockout code 328 for the TRIGON XXL as: Mixing groups configured with the same function.329ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 329 error code – Extension module or mixing group configured with the same functionELCO documents lockout code 329 for the TRIGON XXL as: Extension module or mixing group configured with the…330ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 330 error code – BX1 sensor has no functionELCO documents lockout code 330 for the TRIGON XXL as: BX1 sensor has no function.331ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 331 error code – BX2 sensor has no functionELCO documents lockout code 331 for the TRIGON XXL as: BX2 sensor has no function.332ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 332 error code – BX3 sensor has no functionELCO documents lockout code 332 for the TRIGON XXL as: BX3 sensor has no function.333ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 333 error code – BX4 sensor has no functionELCO documents lockout code 333 for the TRIGON XXL as: BX4 sensor has no function.334ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 334 error code – BX5 sensor has no functionELCO documents lockout code 334 for the TRIGON XXL as: BX5 sensor has no function.335ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 335 error code – BX21 sensor has no function on extension moduleELCO documents lockout code 335 for the TRIGON XXL as: BX21 sensor has no function on extension module.336ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 336 error code – BX22 sensor has no function on extension moduleELCO documents lockout code 336 for the TRIGON XXL as: BX22 sensor has no function on extension module.337ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 337 error code – BX1 sensor has no functionELCO documents lockout code 337 for the TRIGON XXL as: BX1 sensor has no function.338ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 338 error code – BX12 sensor has no functionELCO documents lockout code 338 for the TRIGON XXL as: BX12 sensor has no function.339ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 339 error code – Collector pump Q5 unavailableELCO documents lockout code 339 for the TRIGON XXL as: Collector pump Q5 unavailable.340ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 340 error code – Collector pump Q16 unavailableELCO documents lockout code 340 for the TRIGON XXL as: Collector pump Q16 unavailable.341ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 341 error code – Solar collector sensor B6 unavailableELCO documents lockout code 341 for the TRIGON XXL as: Solar collector sensor B6 unavailable.342ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 342 error code – Domestic-hot-water sensor B31 unavailableELCO documents lockout code 342 for the TRIGON XXL as: Domestic-hot-water sensor B31 unavailable.343ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 343 error code – Solar integration unavailableELCO documents lockout code 343 for the TRIGON XXL as: Solar integration unavailable.344ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 344 error code – Buffer solar control element K8 unavailableELCO documents lockout code 344 for the TRIGON XXL as: Buffer solar control element K8 unavailable.345ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 345 error code – Swimming-pool solar control element K18 unavailableELCO documents lockout code 345 for the TRIGON XXL as: Swimming-pool solar control element K18 unavailable.346ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 346 error code – Solid-fuel boiler pump Q10 unavailableELCO documents lockout code 346 for the TRIGON XXL as: Solid-fuel boiler pump Q10 unavailable.347ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 347 error code – Solid-fuel boiler comparison sensor unavailableELCO documents lockout code 347 for the TRIGON XXL as: Solid-fuel boiler comparison sensor unavailable.348ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 348 error code – Solid-fuel boiler address errorELCO documents lockout code 348 for the TRIGON XXL as: Solid-fuel boiler address error.349ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 349 error code – Buffer return valve Y15 unavailableELCO documents lockout code 349 for the TRIGON XXL as: Buffer return valve Y15 unavailable.350ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 350 error code – Buffer sensor address errorELCO documents lockout code 350 for the TRIGON XXL as: Buffer sensor address error.351ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 351 error code – Primary controller or system pump address errorELCO documents lockout code 351 for the TRIGON XXL as: Primary controller or system pump address error.352ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 352 error code – Pressureless header address errorELCO documents lockout code 352 for the TRIGON XXL as: Pressureless header address error.353ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 353 error code – Common flow sensor B10 unavailableELCO documents lockout code 353 for the TRIGON XXL as: Common flow sensor B10 unavailable.371ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 371 error code – Heating circuit 3 flow-temperature supervision faultELCO documents lockout code 371 for the TRIGON XXL as: Heating circuit 3 flow-temperature supervision fault.372ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 372 error code – Heating circuit 3 limit thermostat faultELCO documents lockout code 372 for the TRIGON XXL as: Heating circuit 3 limit thermostat fault.373ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 373 error code – Extension module 3 collective errorELCO documents lockout code 373 for the TRIGON XXL as: Extension module 3 collective error.386ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 386 error code – Fan speed outside the valid rangeELCO documents lockout code 386 for the TRIGON XXL as: Fan speed outside the valid range.388ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 388 error code – Domestic-hot-water function errorELCO documents lockout code 388 for the TRIGON XXL as: Domestic-hot-water function error.426ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 426 error code – Flue-gas damper feedback faultELCO documents lockout code 426 for the TRIGON XXL as: Flue-gas damper feedback fault.427ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 427 error code – Flue-gas damper configuration faultELCO documents lockout code 427 for the TRIGON XXL as: Flue-gas damper configuration fault.431ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 431 error code – Primary heat-exchanger sensor faultELCO documents lockout code 431 for the TRIGON XXL as: Primary heat-exchanger sensor fault.432ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 432 error code – Functional earth not connectedELCO documents lockout code 432 for the TRIGON XXL as: Functional earth not connected.433ELCO · TRIGON XXL commercial condensing boiler · United Kingdom and EuropeELCO TRIGON XXL 433 error code – Primary heat-exchanger temperature too highELCO documents lockout code 433 for the TRIGON XXL as: Primary heat-exchanger temperature too high.