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Vokera Synergy fault codes

17 codes from the Vokera manual for the Synergy gas boiler. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
AF1DHW anti-freeze function active
AF2Heating anti-freeze function active
E010Flame lockout
E033Rotor fan failure damaged
E034Chimney obstruction in preventilation
E035Blockage obstruction flue gas low power
E036Blockage obstruction flue gas high power
E040Water pressure low, fill the system
E041Fill the system
E050Smoke obstruction error low power
E051Result of a calibration performed under flame instability/obstruction conditions
E055No card fan communication
E091Heat exchanger requires cleaning (unusual usage threshold reached)
E092Calibration failed, excessive number of calibrations within the hour
E093Too many calibration attempts
E095Calibration failed
E099Reset attempts exhausted