North West Gas Compliance

Baxi Fault Codes

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Baxi Fault Codes

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Boilers covered:

  • Baxi Platinum Compact Combi
  • Baxi Duo-tec Compact Combi
  • Baxi Duo-tec Combi
  • Baxi Megaflo Compact System
  • Baxi Megaflo System
  • Baxi Platinum Combi
  • Baxi Platinum+ Combi
  • Baxi EcoBlue Combi and System
  • Baxi 600 Combi and System (earlier generation)
  • Baxi 800 Combi and System (earlier generation)
  • Baxi Assure Combi and System (earlier generation)
  • Main Eco Compact Combi
  • Main Eco Compact System
  • Potterton Assure Combi
  • Potterton Assure System
  • Baxi 200 Combi 2
  • Baxi 400 Combi 2
  • Baxi 400 Combi 2.1
  • Baxi 600 Combi 2
  • Baxi 800 Combi 2
  • Baxi Assure 500 Combi 2
  • Baxi 600 System 2
  • Baxi 800 System 2
  • Baxi Assure 500 System 2
Note: Low-pressure codes (A.02.06, E118, E119 etc.) are often user-fixable. Most others require a Gas Safe engineer. Confirm with your exact model handbook.

Modern Codes (dotted A./E./H.)

Error codePossible faultIf ticked try the troubleshooter
A.00.28Solar temperature sensor removed or reading below range✕
A.00.29Solar temperature sensor shorted or reading above range✕
A.00.34Outdoor temperature sensor expected but not detected✕
A.02.06Low system pressure in heating circuit✓
A.02.18OBD error✕
A.02.36Functional device disconnected✕
A.02.37Passive functional device disconnected✕
A.02.45Connection error✕
A.02.46Device priority error✕
A.02.48Unit function configuration error✕
A.02.49Failed node initialisation✕
A.02.54OpenTherm bus power supply error✕
A.02.55Incorrect or missing serial number✕
A.02.76Internal memory for custom settings full✕
E.00.04Return temperature sensor disconnected✕
E.00.05Return temperature sensor short-circuited✕
E.00.16DHW tank temperature sensor not connected✕
E.00.17DHW tank temperature sensor short-circuited✕
E.00.20Flue gas temperature sensor not connected or below range✕
E.00.21Flue gas temperature sensor short-circuited or above range✕
E.01.04Flame loss detected five times in 24 hours✓
E.01.12Return sensor temperature greater than flow temperature✕
E.01.17No water circulation (permanent)✕
E.01.20Maximum flue gas temperature reached✕
E.02.13Total stoppage (antifreeze not active)✕
E.02.17Permanent communication failure between gas valve and PCB✕
E.02.35Critical safety device disconnected✕
E.02.39Minimum pressure not reached after 6 minutes of automatic filling✕
E.02.47Connection to external device unsuccessful✕
E.04.01Flow temperature sensor short-circuited✕
E.04.02Flow temperature sensor disconnected✕
E.04.03Maximum flow temperature exceeded or sensor short-circuited✕
E.04.08Maximum safe temperature value reached✕
E.04.10Burner failed to ignite after 4 attempts✓
E.04.12Ignition failure (flame monitoring)✓
E.04.13Fan impeller blocked or maximum rpm exceeded✕
E.04.17 / E.04.54Fault in gas valve control circuit✕
E.04.18Flow temperature below minimum or sensor not connected✕
E.04.23 / E.04.29Internal communication stoppage✕
H.00.42Pressure sensor open/faulty✕
H.00.81Room unit disconnected✕
H.01.00Temporary communication failure between gas valve and PCB✓
H.01.05Maximum temperature difference (flow/return) reached✕
H.01.08Flow temperature rising too quickly in heating✕
H.01.14Maximum flow or return temperature reached✕
H.01.18No water circulation (temporary)✓
H.01.21Flow temperature rising too fast in DHW✕
H.02.00Reset in progress✕
H.02.02Waiting for configuration settings✕
H.02.03Configuration settings incorrect✕
H.02.04PCB settings cannot be read✕
H.02.05Setting memory incompatible with PCB type✕
H.02.07Low pressure in heating circuit (permanent)✓
H.02.09Partial stoppage (antifreeze active)✕
H.02.10Total stoppage (antifreeze not active)✕
H.02.70External unit heat recovery test failed✕
H.03.00No identification data for safety device✕
H.03.02Temporary flame loss✓
H.03.05Power supply voltage too low✕
H.03.54Temporary flame loss due to low supply voltage✕

Classic Codes (E-codes)

Error codePossible faultIf ticked try the troubleshooter
E09Gas valve connection fault✕
E10External temperature probe fault✕
E12Water flow switch fault (stuck open)✕
E13Water flow switch fault (stuck closed)✕
E15Gas valve command fault✕
E20Central heating temperature sensor (NTC) fault✕
E28Flue temperature sensor (NTC) fault✕
E40Return central heating temperature sensor (NTC) fault✕
E50Hot water tank temperature sensor (NTC) fault✕
E83No communication✕
E84No communication✕
E85No communication✕
E86No communication✕
E87No communication✕
E103Safety Assist battery exhausted✕
E104Safety Assist circuit board faulty✕
E107Circuit boards not in step✕
E109Pre-circulation alarm✕
E110Max temperature exceeded or safety thermostat tripped✕
E118Water pressure low (below 0.5 bar)✓
E119Water pressure switch error / low pressure✓
E125Water circulation fault✕
E128Safety error for frequent loss of flame✓
E129Safety error for frequent loss of flame with maximum correction✕
E130Flue thermostat sensor tripped✕
E133Gas supply interrupted or flame failure✓
E134Gas valve open without gas✓
E135Internal error✕
E154Flow and return temperature plausibility check✕
E160Fan fault✕
E270Dry fire✕
E317Wrong mains frequency✕
E321DHW temperature sensor fault✕
E384False flame (parasitic flame)✕
E385Under voltage✕