Bosch Hot Water Fault or Error Code 11

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Bosch Hot Water Heater Fault or Error Code 11 Troubleshooting Guide

Bosch is one of the world leaders when it comes to gas hot water heaters and continued technological advancement within the area. The Bosch gas hot water heater is durable, reliable and built to last but, like any appliance, faults can happen at one time or another.

Bosch hot water system

Thankfully, if you have a Bosch hot water temperature controller installed with your hot water system you can use the self-diagnostic code feature to quickly see what is causing the fault in you having no hot water, or your hot water heater simply not operating.

When a fault occurs a Bosch hot water error code will blink on the status monitor of the water temperature remote controller.

If you have one of the following gas hot water heaters;

  • Bosch Electronic Highflow 17e, 21e, 26e
  • Bosch Highflow Condensing C21 or C26

one of the fault codes that you may come across is an error code 11.

What does a Bosch hot water error code 11 indicate?

The Bosch gas hot water fault code 11 signifies that there is a fault in regards to the unit’s ignition.

In this instance your Bosch hot water heater will not operate, or if it does it won’t produce hot water until the fault code 11 has been investigated and resolved.

Can I fix a Bosch hot water fault code myself?

There are certain steps that you can take to try to rectify a Bosch hot water error code 11 yourself, prior to calling in a qualified technician;

Check that the gas valve is open and that your gas supply is sufficient. You can check your gas supply by lighting your gas stove. If the stove does not light, or the flame seems weak, then this is an indicator that there is a problem with the supply.

If everything is working in relation to your gas supply the next step you can try is to press the on/off button on your Bosch water temperature controller to off, turn on a hot water tap, then press the on button on the controller again. If the Bosch code 11 does not return then the problem has been fixed.

If the Bosch error code 11 remains after taking the above steps, or you have determined that there is a problem in relation to your gas supply, your next step is to call a fully qualified technician to investigate and resolve the fault.

For a Bosch hot water heater expert available 24/7 call Jim’s Plumbing

For a Bosch hot water heater specialist you can’t go past Jim’s Plumbing.

At Jim’s Plumbing we have an army of fully qualified plumbers situated across all metropolitan areas of Adelaide, Melbourne, Perth, Sydney, Brisbane and Canberra.

If you have no hot water from your Bosch gas hot water heater then call us on 1300 133 509 for a prompt and reliable hot water heater repair.

Our skilled plumbers are all highly trained in rectifying all Bosch hot water heater error codes, including fault code 11, or any other problems that you may encounter with your hot water system.

It doesn’t matter to us what time of the day or night that you need a plumber, or what day of the year.

We have a local plumber available near you 24 hours a day, 7 days a week, including all public holidays.

We provide a same day service, or can be at your location within the hour* in a gas or plumbing emergency.

For a reliable, affordable and trustworthy plumber call Jim’s Plumbing 24/7.

No Interest Ever!* Payment Plan Options Available

No Interest Ever!* payment plan options available on hot water heater replacements to help ease any financial stress this burden may cause. If your bosch hot water heater is leaking, or you have no hot water, we can often have a plumber to you within the hour*.

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Choosing the correct hot water system can be difficult, as there are so many options to choose from; Click on the links to find out more about these systems.




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Please be advised that we may have additional Bosch Hot Water System models available.

Simply book a plumber online now, or phone 1300 133 509 to book now.

*NO INTEREST EVER!* PAYMENT PLAN, “Fees, terms and conditions apply”.

No Interest Ever!* Payment Plan offered through Certegy Ezi-Pay Express. No Interest Ever on your hot water heater replacement or new supply and installation, gas service, water service or drain replacement. Conditions apply.

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