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Home Heating and cooling

Worcester Bosch boiler problems: error and fault codes

Andy Floyd by Andy Floyd
13/05/2020
in Heating and cooling
2.7k 27
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Should a fault develop with your Worcester Bosch boiler, it will enter a safety lock-out mode, and fault code information will be generated as described below.

Worcester Bosch errors

Locking error

The boiler display will flash a warning triangle and fault code. At the same time a (static) cause code will also be displayed. Manual intervention (Pressing the reset button on the boiler fascia) is required following clearance of the fault.

Blocking error

The boiler will stop operating with no fault data displayed. The cause code, in the info menu, is accessed by pressing the spanner/return button. The condition will clear automatically when the associated fault clears e.g. waiting for an area to cool. In some cases a blocking error has a defined time duration prior to changing to a locking condition.

Fault error

Alpha numeric code indicating the fault group.

Cause error

Three digit number. During a blocking error (or normal operating status) it is not displayed, but accessed in the info menu via the spanner/return button. During a locking error the cause code flashes on the display.

Maintenance codes

These are displayed with the letter H followed by a number. The code advises of a situation that will need some attention but is not a fault that will stop the boiler from functioning. Some of the common ones are listed:

H11

Hot water outlet sensor defect, hot water can still be delivered but with less control.

H13

A time has been set in the Service interval function i.e. 1 to 72 months and that time has expired. Menu 2.5F allows this feature to be set (1 to 72), a 0 will disable this function.

Worcester Bosch fault codes: locking errors

9A: HCM (Heat control module)

  • Cause code: 362
  • Reset type: Reset button
  • Possible cause: Incorrect HCM fitted

9U: HCM (Heat control module)

  • Cause code: 233
  • Reset type: Reset button
  • Possible cause: Problem with the code plug (faulty or not connected)

B7: Internal error

  • Cause code: 257
  • Possible cause: Replace control board

C6: Fan problem

  • Cause code: 215
  • Reset type: Reset button
  • Possible cause: Running too fast

C6: Fan problem

  • Cause code: 216
  • Reset type: Reset button
  • Possible cause: Running too slow

C7: Fan problem

  • Cause code: 214
  • Reset type: Reset button
  • Possible cause: Fan not running

C7: No airflow after a defined period of time

  • Cause code: 217
  • Reset type: Reset button
  • Possible cause: Fan not running or airflow blocked

D1: Return sensor error

  • Cause code: 240
  • Reset type: Reset button
  • Possible cause: Sensor wet or damaged (the boiler will block for 300 seconds before this condition)

D1: Return sensor error

  • Cause code: 241
  • Reset type: Reset button
  • Possible cause: Sensor disconnected or damaged (the boiler will block for 300 seconds before this condition)

D1: Return temperature too high

  • Cause code: 286
  • Reset type: Reset button
  • Possible cause: Boiler overheat

E2: Flow sensor short circuit

  • Cause code: 222
  • Reset type: Reset button
  • Possible cause: Flow sensor shorted or damaged

E2: Flow sensor open circuit

  • Cause code: 223
  • Reset type: Reset button
  • Possible cause: Flow sensor disconnected or damaged

E5: Flow temperature too high

  • Cause code: 218
  • Reset type: Reset button
  • Possible cause: Primary flow sensor overheated

E5: Primary flow sensor has exceeded 110°C

  • Cause code: 332
  • Reset type: Reset button
  • Possible cause: Primary flow sensor overheated

E9: Safety sensor temperature too high

  • Cause code: 219
  • Reset type: Reset button
  • Possible cause: The main heat exchanger has overheated. Maximum temperature 105°C

E9: Safety sensor short circuit

  • Cause code: 220
  • Reset type: Reset button
  • Possible cause: Maximum temperature sensor on the main heat exchanger has failed

E9: Safety sensor open circuit

  • Cause code: 221
  • Reset type: Reset button
  • Possible cause: Maximum temperature sensor on the main heat exchanger has not been recognised

E9: Max temperature thermostat activated

  • Cause code: 224
  • Reset type: Reset button
  • Possible cause: Flue gas thermostat overheat

EA: No flame detected after ignition

  • Cause code: 227
  • Reset type: Reset button
  • Possible cause: Failure of four ignition attempts. The boiler waits 30 seconds before another attempt is made

EA: Loss of flame signal during operation

  • Cause code: 229
  • Reset type: Reset button
  • Possible cause: An established flame has been extinguished. This could be caused by:
    – Moisture in the sump, due to a blocked sump/condensate trap
    – A strong wind into the flue

EA: Gas valve error

  • Cause code: 234
  • Reset type: Reset button
  • Possible cause: Gas valve coil disconnected

EA: Ignition timing error

  • Cause code: 261
  • Reset type: Reset button
  • Possible cause: Flame not established during the first 4 seconds ignition period

EA: Too many short burner starts without confirmation

  • Cause code: 338
  • Reset type: Reset button
  • Possible cause: There is an error where the pump is not detecting water – check pressure gauge and repressurise to 1 bar

Worcester Bosch fault codes: blocking errors

A1: Pump stuck or running in air

  • Cause code: 281
  • Possible cause: Little or no water in the system – check pressure gauge and repressurise to 1 bar

C1: Airflow stopped during operation

  • Cause code: 264
  • Possible cause: Fan has stopped

EA: No ionisation detected after ignition

  • Cause code: 227
  • Possible cause: No flame is detected. The boiler will block during 4 attempts before going to Locking fault

EF: Central heating, boil detect – Large delta T despite minimum burner

  • Cause code: 349
  • Possible cause: The boiler is operating at minimum burner load and there is a greater than 18°C Flow & Return temperature difference

No code: Safety or flow temperature rises too fast

  • Cause code: 212
  • Possible cause: Air lock or reduced water content – check pressure gauge and repressurise to 1 bar

No code: Temperature difference between supply and return exceeding limit

  • Cause code: 213
  • Possible cause: Air lock or reduced water content – check pressure gauge and repressurise to 1 bar

No code: No temperature rise after burner starts

  • Cause code: 260
  • Possible cause: Sensor disconnected or no water content – check pressure gauge and repressurise to 1 bar

 

Experiencing problems with your Worcester Bosch boiler? Our expert repairs team are on hand to diagnose the issue and will aim to get things working again in no time. Alternatively, click here to get a new boiler quote.

Read our disclaimer

 

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Andy Floyd

Andy Floyd

"Alexa, who is Andy Floyd?" Andy is a passionate creative writer, film buff, and smart home enthusiast. He's HomeServe's very own smart assistant, here to answer all of your home and lifestyle questions.

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