All Bosch error codes
Bosch heat pumps don’t use the codes often found online for this brand. Here’s how to read what your unit displays, and how to get its exact meaning.
Can’t find your Bosch code in the list?
Describe your issue to Cody. He identifies the code, tells you what’s happening, and what you can check yourself. If he doesn’t know the code, he looks it up in the manufacturer’s documentation.
How to read your Bosch heat pump codes
Bosch Compress air-to-water heat pumps (3000 AWS, 3400i, 5800i, 6000 AW, 7000i) don’t display codes like E1 through E20. In case of a fault, the screen shows a display code, for example A01 or H01, followed by a 4-digit cause code, such as 5203 for an outdoor sensor fault.
Write down the exact code or message displayed, then give it to Cody : he’ll explain what it means for your model and what you can check.
All Bosch codes published on the site
This list updates automatically whenever a new guide is added.
Technical information provided for guidance only, based on manufacturer documentation and field feedback. It does not replace the diagnosis of a qualified professional. Found an error on this page? Report it.