Baxi [E.01.17] fault codewhat it means and how to fix it

Baxi's newer displays report a circulation failure twice. H.01.18 — H01 alternating with 18 on the 200/400 Combi — is "no water circulation (temporary)", a fault that "prevents the boiler operating but will automatically reset once the cause of the fault has been resolved"; when the board has tried and failed enough it becomes E.01.17, "no water circulation (permanent)", a lockout that "will not automatically reset". The board decides both by watching the flow and return sensors after the pump starts and finding the temperature response of water that is not moving.

The Combi 2 table gives the remedy in two headings: "INSUFFICIENT CIRCULATION — check the installation pressure, activate a manual venting cycle, check the operation of the pump, check the boiler/installation circulation", then "SENSOR ERROR — check the operation of the temperature sensors, check the connection of the temperature sensors". The 200/400 table says the same at more length: "vent the air in the heating system, check the water pressure, check the wiring, check the circulation (direction, pump, valves), check the cleanliness of the heat exchanger", and ends with the sensor. Pressure is on the list for a reason that E118 and E119 taught on the older Baxis — a system that has lost water has lost circulation too — but the code is a movement test, and a boiler at 1.5 bar with a stuck pump will show it.

The reset is the RESET button, one second on a Combi 2 and at least three seconds on a 200 or 400, and the user manual's condition applies: "if the error cannot be reset, or it frequently re-occurs, please contact your Installer, Annual Service Provider or Baxi Customer Support". The same circulation trouble shows earlier as H.01.05, H.01.08, H.01.14 and, on a combi drawing hot water, H.01.21, all of which Baxi list with the identical circulation checks.

1. 1

   Check the pressure reading and bring it to 1 to 1.5 bar if it is low, then bleed any radiator that is cold at the top. Baxi put pressure and venting first.

2. 2

   Make sure some radiator valves are open so the pump has a path.

3. 3

   Reset once: RESET for one second on a Combi 2, at least three seconds on a 200 or 400 Combi. H.01.18 clears on its own once the water moves; E.01.17 needs the button.

   If it returns, the pump or a sensor needs an engineer. Baxi's user manual: contact your installer or Baxi Customer Support if it cannot be reset or recurs.