Bosch Dishwasher error code E27
House power supply too low
Quick answer
On Bosch Dishwasher (2000s onward), E27 is a fault. It means house power supply too low. A first thing to check: Brief outage, brownout, or a momentary voltage dip.
- Applies to
- Bosch Dishwasher
- Bosch dishwasher codes · Dishwasher · 2000s onward
- Type of code
- Fault
- Urgency: Book a technician
- First safe check
- Note whether the unit is running normally now, which is the main thing to establish.
What E27 means on this model
The supply voltage at the machine is below what the control will run on, so it shuts down rather than work erratically. Bosch documents the breaker reset as the first step and an electrician as the answer if it returns, which is the right order to work in.
Symptoms you will notice
- Message appears after a power cut or a storm
- Code shows a voltage value rather than a component name
- Unit resumes normal operation on its own
Common causes
The code tells you what the control detected, not which part failed. These are the causes we see most often, roughly in order of likelihood:
- Brief outage, brownout, or a momentary voltage dip
- Weak supply, a long extension lead, or a power strip
- Utility-side voltage problem on the street
- The cabinet starting its compressor on a supply that cannot hold it
What you can safely check
These are homeowner-level checks. None of them need you to open a live electrical compartment or work on gas.
- Note whether the unit is running normally now, which is the main thing to establish.
- Move the cabinet to a grounded wall outlet on its own circuit.
- Check the receptacle for warmth or discoloration, which would make it a different and more serious problem.
Do not do these
- ×Do not keep a cabinet running on an extension lead or power strip. A compressor that starves on voltage is a compressor that fails early.
- ×Do not ignore a warm or discolored receptacle.
When to call a technician
Worth scheduling, and worth your own checks first
You can usually keep living with this for a short while, but it will not fix itself. Do the safe checks below first, because a tripped switch or a blocked airflow is a five-minute fix that would otherwise cost you a service call.
- If the appliance has stopped mid-cycle, is making a noise you have not heard before, or smells burnt, stop reading here and call. Those are symptoms of something the fault code does not describe well enough.
Changing the outlet is free and worth doing. Electrical work on a receptacle is a licensed job.
What it costs to fix
Parts
No parts in most cases.
Labor
No labour. An electrician is needed for a supply fault.
DIY or technician
Changing the outlet is free and worth doing. Electrical work on a receptacle is a licensed job.
Typical US part and labor ranges, 2026. They vary by region, model and contractor, so treat them as a planning figure, not a quote.
Scope of this code
- Code table
- Bosch dishwasher codes
- Models in scope
- Bosch Dishwasher, 2005 onward
- Checked
- Confirm on your own unit
- Find the model number on the data plate, then check this code in the service manual for that model. Manufacturers revise code tables between model years, and a revised board can renumber a fault.