Error code
Bosch Dishwasher E09 Error - Heating Fault Warning
Bosch dishwasher E09 usually means the dishwasher is not heating water properly. You can check only simple external issues such as programme choice, drainage problems and visible safety concerns; do not open the cabinet or test heater parts.
Quick answer
E09: The dishwasher is not heating water properly.
Meaning
The dishwasher is not heating water properly.
First safe check
Switch the dishwasher off and disconnect power if there is any burning smell, visible water, repeated tripping, or unusual electrical behaviour.
Stop if
Do not remove panels, test heater wiring, access the heat pump, bypass safety devices, or keep using the dishwasher if heating or electrical symptoms continue.
Who to call
Call a dishwasher engineer if E09 returns, dishes finish cold or poorly dried, the appliance trips power, there is a burning smell, water appears underneath, or any diagnosis would require access to heater, heat-pump, wiring, or control parts.
High severity: escalate quickly if it persists. Disconnect power before checking accessible parts where the appliance guidance says to do so.
Fix time
5-10 minutes for safe checks
Difficulty
Engineer repair if persistent
The safe checks are quick, but the likely repair area is internal heating or control hardware.
Expected outcome: If E09 returns after one safe test, the fault should be diagnosed professionally.
What does this error code mean?
Bosch dishwasher E09 usually means the appliance has detected a heating fault. On many Bosch dishwashers this can involve the heating circuit or heat-pump assembly, which is not a safe user-service repair.
The useful home checks are deliberately limited. Confirm the selected programme should heat, check whether the cycle was interrupted by a drain fault, and look for obvious warning signs such as water underneath, burning smells, or repeated electrical trips.
If the dishwasher is also failing to drain, compare Bosch dishwasher E24 or Bosch dishwasher E25. If E09 returns or dishes stay cold and wet, arrange diagnosis rather than opening the machine.
Symptoms users may notice
- Dishes may finish cold, wet, or poorly dried.
- Grease may remain on dishes because wash water is not hot enough.
- E09 may return after the heating stage of the programme.
- The appliance may stop or trip if the heating fault is severe.
What users often notice
- The dishwasher may complete a cycle but leave dishes wet and cool.
- Some users notice E09 after repeated poor drying or after another fault interrupted the wash.
Why is this happening?
- Heating circuit or heat-pump fault inside the dishwasher
- Control system not detecting the expected temperature rise
- Internal wiring or connector fault affecting the heater circuit
- Programme interrupted by another issue before heating completes
- Drainage or water-level issue preventing normal wash and heat behaviour
What this usually points to
E09 usually points to the dishwasher heating path, including the heater, heat-pump assembly on some models, wiring, control readings, and programme conditions needed for heating.
How to fix this safely
- Switch the dishwasher off and disconnect power if there is any burning smell, visible water, repeated tripping, or unusual electrical behaviour.
- Let the appliance cool if it has been running, then check only external signs such as leaks, standing water, or a programme that was interrupted.
- Confirm the selected programme should use heat and that the dishwasher is not stuck because of a drain fault such as Bosch E24 or Bosch E25.
- Try one normal programme only if there is no leak, smell, electrical concern, or standing water in the base.
- Stop and call an engineer if E09 returns, dishes remain cold and wet, or the dishwasher trips the electrics.
Can I fix this myself?
NoE09 is mainly a heating-system fault. User checks should stay limited to programme choice, visible water, drainage symptoms, and safety concerns.
Safety boundary: Do not remove panels, test heater wiring, access the heat pump, bypass safety devices, or keep using the dishwasher if heating or electrical symptoms continue.
What not to do
- Do not keep repeating resets if E09 comes back.
- Do not remove panels or test internal heater, heat-pump, wiring, pump, valve, or control parts.
- Do not ignore burning smells, visible leaks, or repeated electrical trips.
Common misdiagnoses
- E09 can be mistaken for a detergent or rinse-aid issue because dishes stay wet, but the core concern is usually heating.
- Poor drainage can interrupt washing and heating, so check for obvious E24 or E25-style symptoms before assuming the heater alone is at fault.
Reset steps
- Leave the dishwasher powered off briefly after checking there is no leak, burning smell, standing water, or electrical concern.
- Reconnect power only if the appliance appears safe and dry.
- Run one normal heated programme only once to confirm whether the fault returns.
- Stop if E09 returns, dishes stay cold, the appliance smells hot, or it trips the electrics.
Intermittent vs persistent faults
A one-off E09 after an interrupted cycle may not repeat, but any returning E09 should be treated as a persistent heating fault.
When to call a technician
Call a dishwasher engineer if E09 returns, dishes finish cold or poorly dried, the appliance trips power, there is a burning smell, water appears underneath, or any diagnosis would require access to heater, heat-pump, wiring, or control parts.
Safety warning
Disconnect the dishwasher from power if there is any electrical concern, burning smell, leak, or repeated fault. Do not remove panels or work on heater, heat-pump, wiring, pump, valve, or control parts yourself.
Useful hub links
Related heating fault codes
Bosch Dishwasher Error Code E02 - Meaning, Causes & Fix
The dishwasher has detected an electronic control or relay fault.
Bosch Dishwasher Error Code E27
the dishwasher has detected low mains voltage.
Bosch Dishwasher Error Code E01
the dishwasher has detected an electronic control fault.
Bosch Dishwasher Error Code E19
a dishwasher valve or heat-exchanger related component may not be operating correctly.
Relevant guide
Frequently asked questions
What does Bosch dishwasher E09 mean?+
Bosch dishwasher E09 usually means the dishwasher is not heating water properly.
Can I fix Bosch E09 myself?+
Only simple external checks are appropriate. If E09 returns, the likely heating or control parts are internal and should be diagnosed by an engineer.
Can I keep using a Bosch dishwasher with E09?+
No. Avoid normal use if E09 returns, dishes stay cold, there is a burning smell, water leaks, or the appliance trips the electrics.
Will resetting clear Bosch E09?+
A reset may clear a temporary interruption, but repeated E09 usually means the heating fault is still present.
Why are dishes cold and wet with E09?+
If the dishwasher is not heating, water may stay too cool for effective washing and drying, leaving dishes cold, greasy, or wet.
Model variation note
Bosch dishwasher heating assemblies vary by model. Use the exact model manual where available, and keep checks to safe user-accessible observations.