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Andrews Fault Codes
Select a fault code to see its meaning, common causes and how to fix it.
- A01 The A01 fault code on an Andrews boiler indicates that the control system attempted to start the burner but failed to… Read more →
- A02 The A02 fault code means the boiler's control system is detecting a flame signal even though the burner has been… Read more →
- A03 The A03 fault code on Andrews boilers (including Andrews Water Heaters commercial units) signals a protective lockout,… Read more →
- A05 The A05 code indicates that the boiler or water heater has shut itself down because it cannot confirm the combustion… Read more →
- A06 The A06 code signals that the boiler has detected an unsafe condition and locked itself out as a precaution. On most… Read more →
- A08 The A08 code indicates a problem with the return NTC thermistor — the temperature sensor that monitors the water coming… Read more →
- A09 On Andrews water heaters and boilers, the letter 'A' in a fault code indicates a full lockout — the appliance has shut… Read more →
- A10 The A10 fault code on Andrews water heaters indicates that the appliance has attempted to light the burner but failed… Read more →
- A11 The A11 code appears on Andrews MAXXflo and Maxiflo commercial gas-fired water heaters when the flow temperature on… Read more →
- A12 The A12 fault code signals that the water pressure inside the heating system has fallen below the minimum threshold the… Read more →
- A14 On Andrews MAXXflo multi-burner commercial water heaters, fault codes are displayed as a letter paired with a number.… Read more →
- A15 On Andrews commercial water heaters and boilers (including the MAXXflo and CWH range), fault codes beginning with the… Read more →
- A16 The A16 fault code indicates a gas valve failure on Andrews boilers built on the Ferroli platform. The boiler's control… Read more →
- A17 On Andrews commercial water heaters, fault codes beginning with the letter 'A' denote a lockout condition — a hard… Read more →
- A19 The A19 code appears on certain Andrews water heater and boiler displays, but its precise definition varies depending… Read more →
- A20 On Andrews commercial gas-fired water heaters, fault codes are displayed as a letter followed by a number. The letter… Read more →
- A21 The A21 code appears when your Worcester Bosch boiler loses its radio frequency (RF) communication link with the paired… Read more →
- A24 On the Andrews MAXXflo, fault codes are displayed as a letter followed by a number. The letter indicates the fault… Read more →
- E0 The E0 fault code on Andrews boilers most commonly points to a problem with the return or flow temperature sensor — the… Read more →
- E09 The E09 fault code on Andrews (Andrews Water Heaters by Baxi) boilers signals that the boiler's main control board… Read more →
- E12 The E12 fault code on Andrews boilers indicates that the differential water flow switch is reading as open when the… Read more →
- E13 The E13 code on an Andrews boiler signals that the differential water flow switch is reading as closed when it should… Read more →
- E14 The E14 code on an Andrews water heater or boiler indicates that the appliance has attempted to light the burner but… Read more →
- E15 The E15 code on an Andrews boiler indicates that the boiler's electronic controls have detected a problem with the gas… Read more →
- E16 The E16 fault on Andrews boilers most commonly indicates a problem with the return or flow water temperature sensor… Read more →
- E18 The E18 code on Andrews boilers and water heaters covers two closely related situations depending on the model. On most… Read more →
- E19 The E19 fault code on Andrews CWH-series water heaters signals that the system has detected water pressure below the… Read more →
- E20 The E20 fault code on Andrews boilers (including Andrews Water Heaters commercial units, which share the Baxi Group… Read more →
- E22 The E22 code on an Andrews water heater most likely indicates an ignition or flame detection fault — part of the E2x… Read more →
- E28 The E28 fault code on Andrews boilers (which share their platform and fault-code conventions with Baxi Group products,… Read more →
- E29 The E29 code on an Andrews boiler indicates a flame-loss lockout. Unlike a fault where the boiler fails to ignite in… Read more →
- E30 On Andrews commercial water heaters and boilers, fault codes follow a two-part structure: a letter prefix that tells… Read more →
- E31 The E31 code on Andrews boilers and water heaters (including ECOflo and MAXXflo series) indicates that the control… Read more →
- E33 The E33 code on Andrews water heaters and boilers indicates that the control board has detected a problem with the NTC… Read more →
- E41 The E41 code on Andrews boilers signals that the control board has detected the heating flow water temperature is… Read more →
- E42 The E42 code on Andrews water heaters and boilers indicates that the control board has detected an abnormal temperature… Read more →
- E47 The E47 fault code on Andrews boilers indicates that the boiler's primary temperature sensor (sensor 1) has reported a… Read more →
- E48 The E48 fault code on Andrews boilers (which share the Warmflow platform and fault code table) indicates that the… Read more →
- E60 The E60 code on an Andrews boiler indicates a problem with the flue fan (also called the combustion fan or draught… Read more →
- E63 The E63 code on Andrews MAXXflo commercial condensing water heaters signals that the return water temperature sensor… Read more →
- E64 The E64 code appearing on an Andrews water heater or boiler display is not a fault code that features in any publicly… Read more →
- E70 The E70 code on Andrews MAXXflo and CWH-series water heaters signals a lockout condition originating from the slave… Read more →
- E78 The E78 fault code on Andrews water heaters (Baxi GA Range) indicates that the boiler's control board has detected the… Read more →