With the help of Baxi boiler error codes table one can significantly optimize functioning and repairs of heating appliances of this make. There is a table below with a brief description of each of the codes, which can be specified on a Baxi unit monitor.
| Code | Meaning/effect | Cause/remedy |
|---|---|---|
| IN 581 | Replenish fuel The reserve supply container is almost empty.Top up pellets. | Fill fuel into the fuel container (see section 2.3). |
| IN 582 | Reserve supply container empty The reserve supply container is empty. Top up pellets. Burner is locked. | Fill fuel into the fuel container (see section 2.3). |
| IN 590 | Clean boiler and burner Perform cleaning and confirm in operator level. | Boiler and burner are still operating. Boiler and burner must be cleaned or the both ash pan(s) (see Fig. 162) emptied (see sections 3.4, 3.5 and 3.6). Following cleaning, confirm cleaning on the Info panel operator level (see section 2.8.1.1). |
| IN 595 | Door open Burner locked. Only open the door when the burner is switched off. | Cladding door is open, burner locked. a) Close the cladding door. b) Door switch on cladding door does not switch correctly, adjust see installation instructions. |
| FE 206 | Monitoring of the auger conveyor is defective Press Reset. | The boiler is in operation. Press the Reset button. If the fault reoccurs after a reset, inform BAXI Customer Service or a heating technician. |
| FE 356 | Combustion chamber pressure not stable Press Reset. | The boiler is in operation. a) Heating surface cover leaking, check whether this is firmly closed (see section 3.8), press the Reset button. b) Combustion chamber and ash door are leaking check the seal, replace the seal if necessary, press the reset button. c) Pressure measuring nipple of combustion chamber pressure switch is blokked clear it (see section 3.9.1), press the reset button. d) Intake air line or induction opening at rear is blocked clear it and press the reset button. e) Exhaust pipe or flue is blocked, clear it and press the reset button. f) Combustion chamber pressure switch is defective, inform BAXI Customer Service or a heating technician. |
| FE 382 | Fill level switch in reserve supply container defective Check the switch in the reserve supply container. Press Reset. | The boiler does not operate. a) Fill level switch (proximity switch) dirty, remove the dust (see section 3.7), press the Reset button. b) Fill level switch (proximity switch) in the reserve supply container defective inform BAXI Customer Service or a heating technician. |
| FE 390 | Emergency operation! Clean boiler and burner Perform cleaning and confirm in operator level. | The boiler is in cyclic operation, i.e. has idle times. a) Boiler and burner must be cleaned or the both ash pan(s) (see Fig. 108) emptied (see sections 3.4, 3.5 and 3.6). Following cleaning, confirm cleaning on the Info panel operator level (see section 2.8.1.1). b) Motor or limit switch of ash compactor defective, inform BAXI Customer Service or a heating technician. |
| AL 005 | Shake-out defective Shake-out defective or sticking. Clean the burner pot. Press Reset. | Shake-out motor no longer moves or no longer reaches the end position, boiler switches to burnout mode. a) Burner contamination; close combustion chamber doors, press reset button; once the alarm message is rectified, clean the burner pot as described in section 3.6. The glow ignition is located in the primary air tube so avoid sha/ ! \ king the burner pot violently risk of breakage! If the alarm message remains active, clean the burner pot as described in section 3.6. Note: Grate olate at too can onlv be raised and removed when closed. If the grate plate is not fully closed, vacuum it out. Close combustion chamber door, press reset button, if the alarm message remains in place, repeat the process or inform Baxi Customer Service or a heating technician. b) Grate plate not inserted correctly or check correct installation position {see section 3.6). c) Motor for shake-out defective, inform BAXI Customer Service or a heating technician. d) Limit switch defective, inform BAXI Customer Service or a heating technician. |
| AL 006 | Auger conveyor motor defective Auger conveyor motor defective. Press Reset. | Boiler enters burnout mode, vacuum fan is stopped immediately. a) Auger conveyor or rotary feeder jammed due to a foreign body, clean the reserve supply container, opening above auger conveyor or rotary feeder (see section 3.9) and remove the foreign body. Press the Reset button.The alarm message AL 171 may light on up to 2 occasions until the boiler starts operating again, press the Reset button. b) Control thermostat defective, inform Baxi Customer Service or a heating technician. c) Press the Reset button. If the malfunction recurs immediately after a short period, or recurs at regular intervals, contact Baxi Customer Service or your heating technician. d) Renew the auger conveyor motor, inform Baxi Customer Service or a heating technician. |
| AL 016 | Vacuum fan defective Clean blower wheel and blower box. Press Reset. | The actual speed is different from the nominal speed.The boiler switches to burnout mode. a) The blower wheel and blower box are dirty, press the Reset button. If the malfunction recurs immediately after a short period, or recurs at regular intervals, contact Baxi Customer Service or your heating technician. b) Replace the vacuum fan motor, inform Baxi Customer Service or a heating technician. |
| AL 062 | Air intake/exhaust flap defective Air intake/exhaust flap defective or not opening. Check flap. Press Reset. | External air choke (optional) does not open. a) Check the air choke, press the Reset button. b) Inform Baxi Customer Service or a heating technician. |
| AL 071 | Safety / emergency switch open Check switch position of safety / emergency switches. | Boiler enters burnout mode but the blower does not run. Switch on emergency heating/OFF switch. |
| AL 076 | Boiler sensor defective Check the boiler sensor and connections. Press Reset. | The boiler switches to burnout mode. a) Press the Reset button. If the malfunction recurs immediately after a short period, or recurs at regular intervals, contact Baxi Customer Service or your heating technician. b) Replace the boiler sensor, inform Baxi Customer Service or a heating technician. |
| AL 078 | Thermocontrol sensor defective Check the thermocontrol sensor and connections. Press Reset. | The boiler switches to burnout mode. a) Thermocontrol sensor is too cold b) Press the Reset button. If the malfunction recurs immediately after a short period, or recurs at regular intervals, contact Baxi Customer Service or your heating technician. c) Replace the thermocontrol sensor, inform Baxi Customer Service or a heating technician. |
| AL128 | No flame formation in control mode Clean boiler and burner. Press Reset. | The flame goes out in modulation mode.The boiler switches to burnout mode. a) Clean the burner and the boiler. Check the exhaust pipe to the flue and clean it if necessary, press the Reset button. b) Auger conveyor or rotary feeder jammed due to a foreign body. Clean the reserve supply container, opening above auger conveyor or rotary feeder (see section 3.7) and remove the foreign body. Press the Reset button.The alarm message AL 171 may light on up to 2 occasions until the boiler starts operating again, press the Reset button. c) Inform Baxi Customer Service or a heating technician. |
| AL 133 | Safety temperature shutdown Check the system and filling pressure. Press Release button on boiler. | Boiler temperature is above 100 °C, boiler enters burnout mode, vacuum fan is switched off immediately. a) Check the water level or pressure in the heating system refill, bleed the air. b) Air in the heating system bleed air. c) The heat pump or boiler feed pump is sticking or is defective start pump manually or have it repaired. Once the boiler water temperature falls below 90 ®C, remove the cover, press the Release button of the safety thermostat B7 firmly Fig. 163. If the malfunction occurs after a short period, or recurs at regular intervals, contact Baxi Customer Service or your heating technician. |
| AL 135 | Excess temperature in the auger tube Check the burner. Press Release button B7a on control panel. | The boiler switches to burnout mode. a) Check the burner, remove all pellets from the burner pot. b) Remove the cover from the safety thermostat auger tube B7a. press the Release button firmly (see Fig. 163). If the ignition does not function first time (AL 171), press the Reset button (pellets in the auger conveyor will have been damaged due to the higher temperature). |
| Status signal | Description | Cause | Remedial actions by service engineer |
|---|---|---|---|
| 1 flash green | Temperature protection | • Maximum flow temperature exceeded, • Flow temperature rise rate too high, • Excessive difference between flow and return temperature | • Check system circulation & pump operation • Check demands for boiler operation (switched live operation) • Check temperature setting • Check temperature sensors in boiler |
| 2 flashes green | Shutdown input | • BL terminals on User Interaction Controller are open circuit | • If condensate pump is wired to these terminals check operation of condensate pump • Check wiring to BL terminals (link present or connections to external device correct) |
| 3 flashes green | Flame loss | • No flame detected during operation | • Check gas supply is turned on and gas is available if on a pre-payment meter • Check flue condition |
| 4 flashes green | Communication fault | • Bad connection or wiring fault • Internal communication fault | • Check wiring/connections between boiler and User Interaction Controller and within the box • If necessary replace control/fan assy |
| 5 flashes green | Parameter fault | • Parameter error or faulty PU • Configuration error or PCB fault | • Replace PU and recommission • Replace control/fan assy |
| 6 flashes green | Miscellaneous | • Internal fault in combustion control unit | • Replace combustion control unit |
| 1 flash red | Sensor error | • Bad connection to flow or return temperature sensor • Fault with flow or return temperature sensor(s) • Low or no flow through boiler • Reverse flow through boiler | • Check connections to temperature sensors/PCB and condition of wiring loom • Check resistance of temperature sensors • Check pump operation and system circulation |
| 2 flashes red | High temperature protection | • Over-temperature thermostat on heat exchanger activated • No water flow through heat exchanger • Over-temperature thermostat fault or bad connection (open circuit). • PCB over-temperature condition • Flue fault resulting in recirculation or activation of air pressure switch (if fitted) | • Check connections to and operation of OfT thermostat and air pressure switch (if fitted) and PCB and condition of wiring loom • Check system pressure or that system is not air-locked • Check pump operation and system circulation • Check flue condition |
| 3 flashes red | Ignition fault | • No ignition • No flame detected following ignition • False flame signal detected • Repeated loss of flame detected | • Check earthing of the appliance • Check ignition electrode condition and clean/replace if necessary • Check gas valve operation • Check flue condition • Check correct combustion/gas valve settings • Check condensate drain for blockage |
| 4 flashes red | Fan fault | • Fan calibration error • Fan failure | • If fan operates, check flue installation and condition. • Replace control/fan assy |
| 5 flashes red | Parameter fault | • Bad connection to PU • Parameter error or faulty PU | • PCB and condition of wiring loom • Replace PU and recommission |
| 6 flashes red | Miscellaneous | • Bad connection or wiring fault internal or external to the boiler • Parameter error • Communication error | • Check all wiring connections are correctly made • Using a service tool or Recom software check all parameter settings • If necessary replace PU and/or control/fan assy |
| Error code: Display | Description |
|---|---|
| 10: Outside sensor | Fault outside temp sensor 1 |
| 20: Boiler flow sensor | Fault boiler flow temp sensor |
| 40: Boiler return sensor | Fault return temp sensor boiler |
| 50: DHW tank sensor | Fault DHWI sensor |
| 60: Room sensor 1 | Fault room temp sensor HC1 |
| 65: Room sensor 2 | Fault room temp sensor HC2 |
| 83: BSB short-circuit | Boiler system bus short-circuit |
| 84: BSB address collision | More then 1 room units are assigned to the same HC Assign one of them to HC2 or assign QAA7x not as room unit |
| 85: Radio communication | Communication to radio device interrupted |
| 95: Time of day invalid | The real time clock unit detected corrupted time of day. |
| 96: Minor SW failure | Failure in Class B-SW: Stack overflow or program sequence failure |
| 127: Legionella temperature | Legionella temperature not achieved within 48 hours |
| 157: Boiler Flow Overheat stat | Boiler flow overheat thermostat / safety chain open |
| 158: Condensate | Condensate switch of safety chain opened |
| 164: Flow | Intermitent Low flow or faulty flow detector |
| 257: Pack sensor | Fault pack temp sensor |
| 258: Pack overtemp | Internal ambient temperature to high |
| 259: CJC sensor | Fault cold junction compensation sensor |
| 261: Loss of Engine flame | No flame after five ignition tries in Engine |
| 262: Loss of Supplementary flame | No flame after five ignition tries in Supplementary |
| 263: Engine BCU failure | Multiple communication request of Engine Burner Control Unit unsuccessful. 1) Failure caused by BCU 2) BCU Communication Timeout on Main Control Board |
| 264: Supp. BCU failure | Multiple communication request of Supp. Burner Control Unit unsuccessful. 1) Failure caused by BCU 2) BCU Communication Timeout on Main Control Board |
| 270: excessive temp. diff. | Excessive max temperature difference across the heat exchanger |
| during 5 minutes or excessive limit temperature difference. If temperature difference fell below (threshold switching differential boiler): automatic reset when the maximum setting was exceeded immediately when the limit value was exceeded after 10 minutes | |
| 274: Dry fire protection | 7 l/min boiler flow not detected after 4 minutes |
| 278: Max Temp Rise | Maximum flow temperature rise exceeded, automatic reset after 10 minutes |
| 280 : Engine dome overtemp | Engine dome overtemp has operated |
| 282: G83/ENS/G1M | G83/ENS module has detected an unhealthy mains condition |
| 285: Alternator Short | Power monitor 1C has detected a short-circuit condition |
| 287: Eng head under temp | Engine head temperature thermocouple measurement below 103 degrees C when the CX relay is energised |
| 298: False flame engine | Ionisation probe of engine burner detected false flame |
| 299: False flame supplementary | Ionisation probe of supplementary burner detected false flame |
| 300: Eng head under temp | Engine head control temperature less than 150 degrees C when CX relay is energised |
| 301: Eng head over temp | Engine head control temperature greater than 540 degrees C |
| 302: Eng head thermocouple | Magnitude of the difference between the engine head control and limit thermocouples is greater than 100 degrees C |
| 303: Control thermocouple | Engine head control thermocouple failure |
| 304: Limit thermocouple | Engine head limit thermocouple failure |
| 309: Power fail detection | Power failure to fan detected 24v dc supply |
| 310: Power monitor comm. | No data received from the power meter 1C in the last 10 seconds or the power monitor failed to register with the EGC microcontroller within 10 seconds of power up |
| 311: EGC comm, failure | Communication timeout or communication failure |
| 421: Eng bu exc temp diff hex | Engine burner excessive temperature difference across the heat exchanger |
| 422: BCU Eng bu inconsistent | Transmitted state of the engine burner BCU isn't consistent |
| 423: BCU Supp bu inconsistent | Transmitted state of the supplementary burner BCU isn't consistent |
| 424: Rep. loss of flame Eng bu | Repeated loss of flame engine burner |
| 425: Rep. loss of flame Supp bu | repeated loss of flame supplementary burner |
| Code | Cause |
|---|---|
| E20 | Central Heating NTC Fault |
| E28 | Rue NTC Fault |
| EIIO | Safety Thermostat Operated |
| El19 | Water Pressure Switch Not Operated |
| El25 | Circulation Fault (Primary Circuit) |
| El30 | Rue NTC Operated |
| El33 | Interruption Of Gas Supply or Flame Failure |
| El60 | Fan or Fan Wiring Fault |
| El93 | Pre-Circulation Fault |