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Bosch Error Code A4

What Does the Bosch Error Code A4 Mean?

With your water temperature controller, you can conveniently self-diagnose any faults that occur within the unit. If a fault is detected the digital monitor of the controller will flash an error code. This error code pinpoints exactly what is wrong within the appliance, allowing for a fast repair. One of the Bosch hot water error codes that may be displayed is code A4.

If the Bosch fault code A4 is flashing on the status monitor of your controller this indicates a faulty air temperature sensor. The air temperature sensor is a safety device within the appliance to ensure overheating does not occur. In most cases your Bosch hot water heater will cease to operate until the error code A4 is repaired and cleared.

Bosch Error Code Repairs and Servicing

To resolve the A4 error code you will need to engage the services of a fully qualified technician. For a Bosch hot water heater repair expert call your local plumber from Jim’s Plumbing. The good news is we cover all metropolitan areas 24 hours a day, 7 days a week, including all public holidays.

When you call Jim’s Plumbing to repair your A4 Bosch fault code you are guaranteed a same day service. Need a plumber urgently? No worries – in a gas or plumbing emergency we strive to have a fully qualified plumber to your location within the hour* of your call.

To rectify the Bosch A4 error code, your attending Jim’s plumber will check the systems sensor wiring for any loose or damaged connections leading back to the PC board. The sensor will be checked for any scale build-up and cleaned if found. If the fault code A4 remains then the last step will be to replace the temperature sensor.

Having your hot water heater serviced as per manufacturers’ instructions will greatly reduce the risk of faults occurring with the appliance, as well as keeping it operating an optimum efficiency. If you can’t remember the last time your hot water system was serviced then just ask your attending Jim’s plumber about our preventative maintenance services.

You can always be sure that with Jim’s you’re receiving quality, friendly service that guarantees:

  • 24/7 availability
  • Service within an hour*
  • Fully qualified and licensed plumbers
  • 12 month warranty
  • $0 deposit, interest free options**
  • Fully stocked van
  • $20 million public liability insurance
  • Over 15 years’ experience

Clear your Bosch A4 error code on the same day as your booking when you call Jim’s Plumbing. We’re here for you 24/7.

1300 133 509


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