E01Ignition failure, no flame detectedE02Overheating (safety limit tripped)E03Flue (exhaust) faultE04Water pressure too lowE16Fan faultE22Control system errorE31Remote control / thermostat errorE98Power supply voltage out of rangeE99Safety lockout
Arçelik boiler fault codes
Full list of Arçelik boiler fault codes with meanings, common causes and safe first steps.