Bosch Dishwasher E27 — What It Means & How to Fix It
E27 means the house power supply to the dishwasher is too low — reset the breaker, and if the code comes back, Bosch's advice is to have an electrician check the incoming voltage.
What this code means
Bosch's US error-code page gives E27 as: the house power supply to the unit is too low. Its steps are to reset power at the breaker for 30 seconds and, if the error occurs again, to contact an electrician to check the incoming voltage to the appliance. The fault is in the supply, not the dishwasher.
Bosch's US error-code page lists E27 as the house power supply being too low. Newer models show the same condition as E9001.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Low voltage on the household supply | Common | No — electrician |
| Overloaded or shared circuit | Common | Partly — move other appliances off the circuit |
| Loose connection at the junction box or outlet | Occasional | No — electrician |
What you can try yourself
- Switch the dishwasher off.
- Turn its circuit breaker off for 30 seconds, then back on.
- Run a cycle with other heavy appliances on the same circuit switched off.
- If E27 occurs again, contact an electrician to check the incoming voltage to the dishwasher.
When to call a technician
- E27 returns after a breaker reset.
- Lights dim or other appliances misbehave when the dishwasher runs.
- The breaker trips, or the outlet or junction box is warm.
Typical professional repair cost: An electrician visit to test the circuit typically runs $100–$250; the dishwasher itself usually needs no repair.
Frequently asked questions
What does E27 mean on a Bosch dishwasher?
Bosch says the house power supply to the unit is too low. Reset the breaker for 30 seconds; if the code returns, have an electrician check the incoming voltage.
Is the dishwasher broken?
Bosch's description points at the supply to the dishwasher, not a part inside it. That is why its next step is an electrician rather than a repair visit.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Bosch codes
- Bosch Dishwasher E15 Water reached the base pan under the tub and Bosch's leak protection locked the machine — sometimes a genuine leak, often a one-off spill or condensation that clears once the base dries.
- Bosch Dishwasher E24 The dishwasher can't drain properly — start with the filter, then the drain hose path, and don't skip checking that the drain pump cover is seated.
- Bosch Dishwasher E25 The drain pump itself is blocked or its cover is loose — and Bosch makes the pump cover owner-accessible, so this is one of the most fixable codes the brand throws.
- Bosch Dishwasher E09 The heating system isn't raising the water temperature — beyond one reset, the flow-through heater is a mains-voltage part that belongs to a technician.
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