Baxi Duo-tec – Platinum & Megaflo

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.


Error code Possible faultInstaller action
E10Outdoor Sensor ErrorOutdoor Sensor Fault, Check The Sensor: Check In IP Menu The Outdoor Sensor Value Reads Correctly.
E20Central Heating Thermistor Sensor FaultCheck resistance reading across the Sensor is approx. 12kohms at 25 degrees c. if not suspect sensor.
E28Flue Thermistor FaultCheck flue Sensor Value Reads Correctly. Check for blocked flue.
E110Boiler Overheat TrippedCheck that boiler temp is not over 110 degrees C; Check for continuity across the O/H stat; Check pump for circulation; Clear air from system.
E119System Pressure Low (< 0.5 Bar)Check for water leaks; Check the expansion vessel has the correct charge; Add Water Via Filling Loop. Restoring The Correct Pressure Will Reset The Error.
E125Primary Water Circulation FaultCheck pump; Check that the system is full of water; Clear air from system; Check for blockages in the system; Check that the thermistors are correctly located.
E131Flue Overheat LockoutThis May Follow A Power Cut, Try Reset; Flue NTC Sensor Exceeded 130C, check resistance across Flue NTC sensor.Possible blocked internal heat exchanger water ways.
E133Ignition FaultCheck The Wiring; Check The Supply Pressure; Purge The Gas Supply To Remove Air; Check for spark at electrode; Check Ignition and sensing Electrode Condition and Clean/Replace If Necessary; Check Gas Valve is opening; Check Condensate Drain For Blockage.
E160Fan FaultCheck The Fan And The Cable; Probable cause fan failure.
E161Fan FaultCheck The Fan And The Cable; Probable cause fan failure.
E164Heating Flow Switch Error (Ireland) Pressure Sensor Error (UK)For HEa: Irish System Boilers Have Flow Switches So Check The Switch Operation. For HEa: If UK boiler, fit correct PCB.
E167PCB Fault
E168PCB Lock OutMay Follow Power Supply Problem; Try Reset.
E193Circulation FaultThis error, if it persists, will be followed by E125.

Disclaimer: Information on this website is provided for informational purpose therefore we cannot accept liability for subsequent problems. All repair tasks should be carried out by qualified trades people. We may also receive commission payments when you are taken to external websites and complete purchases from third party sellers, once you leave our site, we cannot be held liable for your purchases.