If your Baxi boiler develops a problem, try not to panic. The boiler will display an error code that can help you to figure out what the exact problem is. Your boiler will not be experiencing a fault unless the code showing has an E prefix. If the code does not have an E prefix it is not a fault but a status at which the boiler is operating.
In the event of a fault, the status signal for the Baxi status button button will flash red. The most common Baxi fault and operation codes are listed below:
Baxi boiler fault codes
E10: Outside sensor error
E20: Central heating thermostat sensor fault
E28: Flue Thermistor Fault
E54: HW Flow sensor fault
E78: Water pressure sensor fault
E100: Internal clock time error on PCB
E109: Poor circulation
Baxi boiler operating status codes
110: Overheat
111: Maximum limit of flow temperature
117: Water pressure too high
118: Water pressure too low
119: System pressure low (< 0.5 bar)
125: Water circulation fault
127: Legionella protection temperature not reached
128: Loss of flame during operation
133: Safety time to establish flame exceeded
153: Force reset unit unlocked
160: Fan fault
162: Air pressure switch error
164: Ireland – heating flow switch error. UK: Pressure sensor error
166: Air pressure switch fault
270: Dry fire
432: Earth connector error
433: Heat exchanger temperature exceeded (greater than 95 degrees)
Baxi boiler abbreviations
LTH: Low temperature heating
DHW: Domestic hot water
HRU: Heat Recovery Unit
PCU: Primary Control Unit – Electronic system to control burner function
SCU: Secondary Control Unit – Additional electronic system
Please note that if you smell gas coming from your boiler this is extremely dangerous and it is recommended that you open all of your windows, evacuate the premises and contact a Gas Safe Registered engineer immediately.
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