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Keston · Boilers and HVAC

Keston C45, C40P, C55 and C55P condensing boilers

Product information, applicable models, official documentation and 25 indexed error-code explanations for Keston C45, C40P, C55 and C55P condensing boilers.

Keston C45, C40P, C55 and C55P condensing boilers
25indexed codes
1named models or series
1official links
Product overview

About Keston C45, C40P, C55 and C55P condensing boilers

Keston C45, C40P, C55 and C55P condensing boilers is indexed in the Boilers and HVAC directory for United Kingdom and Ireland. This page brings the available product context, model references, documentation and diagnostic codes together in one place.

The codes below apply only where the linked code page lists this product or model. Confirm the complete model identifier because manufacturers may reuse the same characters across different ranges, generations and control systems.

An error code describes a condition detected by the product; it does not prove that a named component has failed. Follow the exact manual, avoid repeated resets and use an appropriately qualified technician whenever checks require internal access.

Applicability

Models and series

C45; C40P; C55; C55P
Complete directory

All Keston C45, C40P, C55 and C55P condensing boilers error codes

Showing 1–25 of 25

B18Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB18 – Flow temperature exceeds 95°CKeston documents B18 for the C45, C40P, C55 and C55P as “Flow temperature exceeds 95°C”. This meaning applies…B19Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB19 – Return temperature exceeds 95°CKeston documents B19 for the C45, C40P, C55 and C55P as “Return temperature exceeds 95°C”. This meaning applies…B24Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB24 – Return temperature exceeds flow temperatureKeston documents B24 for the C45, C40P, C55 and C55P as “Return temperature exceeds flow temperature”. This meaning…B25Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB25 – Flow temperature climbing too quicklyKeston documents B25 for the C45, C40P, C55 and C55P as “Flow temperature climbing too quickly”. This meaning…B26Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB26 – Low water pressureKeston documents B26 for the C45, C40P, C55 and C55P as “Low water pressure”. This meaning applies to…B28Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB28 – No fan signalKeston documents B28 for the C45, C40P, C55 and C55P as “No fan signal”. This meaning applies to…B29Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB29 – Incorrect fan signalKeston documents B29 for the C45, C40P, C55 and C55P as “Incorrect fan signal”. This meaning applies to…B30Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB30 – Flow and return temperature difference too highKeston documents B30 for the C45, C40P, C55 and C55P as “Flow and return temperature difference too high”.…B65Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandB65 – Waiting for fan to startKeston documents B65 for the C45, C40P, C55 and C55P as “Waiting for fan to start”. This meaning…E00Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE00 – Flame detected when not expectedKeston documents E00 for the C45, C40P, C55 and C55P as “Flame detected when not expected”. This meaning…E02Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE02 – No ignition after restartKeston documents E02 for the C45, C40P, C55 and C55P as “No ignition after restart”. This meaning applies…E03Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE03 – Gas valve faulty or disconnectedKeston documents E03 for the C45, C40P, C55 and C55P as “Gas valve faulty or disconnected”. This meaning…E04Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE04 – Power reset while boiler was in lockoutKeston documents E04 for the C45, C40P, C55 and C55P as “Power reset while boiler was in lockout”.…E11Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE11 – Internal electronics errorKeston documents E11 for the C45, C40P, C55 and C55P as “Internal electronics error”. This meaning applies to…E12Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE12 – Thermal fuse blown or flue overheat thermostat activatedKeston documents E12 for the C45, C40P, C55 and C55P as “Thermal fuse blown or flue overheat thermostat…E18Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE18 – Flow overheatKeston documents E18 for the C45, C40P, C55 and C55P as “Flow overheat”. This meaning applies to this…E19Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE19 – Maximum return temperature exceededKeston documents E19 for the C45, C40P, C55 and C55P as “Maximum return temperature exceeded”. This meaning applies…E25Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE25 – Flow temperature increased too quicklyKeston documents E25 for the C45, C40P, C55 and C55P as “Flow temperature increased too quickly”. This meaning…E28Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE28 – Fan not rotatingKeston documents E28 for the C45, C40P, C55 and C55P as “Fan not rotating”. This meaning applies to…E30Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE30 – Flow and return temperature difference too highKeston documents E30 for the C45, C40P, C55 and C55P as “Flow and return temperature difference too high”.…E31Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE31 – Flow thermistor short circuitKeston documents E31 for the C45, C40P, C55 and C55P as “Flow thermistor short circuit”. This meaning applies…E32Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE32 – Return thermistor short circuitKeston documents E32 for the C45, C40P, C55 and C55P as “Return thermistor short circuit”. This meaning applies…E36Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE36 – Flow thermistor open circuitKeston documents E36 for the C45, C40P, C55 and C55P as “Flow thermistor open circuit”. This meaning applies…E37Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE37 – Return thermistor open circuitKeston documents E37 for the C45, C40P, C55 and C55P as “Return thermistor open circuit”. This meaning applies…E44Keston · Keston C45, C40P, C55 and C55P condensing boilers · United Kingdom and IrelandE44 – Low water pressureKeston documents E44 for the C45, C40P, C55 and C55P as “Low water pressure”. This meaning applies to…