E16
Bosch Washing Machine
Severity: ModerateWhat Does This Error Mean?
The E16 error means your Bosch washing machine is taking too long to heat the water. The heating element is working but not reaching the set temperature in time. This points to a weak heater, heavy limescale, or a temperature sensor fault.
Affected Models
- WAW285H2GB
- WAN28080GB
- WAT28400GB
- Most Bosch front-load washing machines
Common Causes
- The heating element is coated in limescale and losing efficiency
- The heating element is partially failing — it heats but not strongly enough
- The NTC temperature sensor is giving a slow or inaccurate reading
- Incoming water is unusually cold — slowing the heating process
- The control board is cutting heating time short due to a timer fault
How to Fix It
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Run a full descaling cycle using a washing machine descaler or citric acid.
Limescale is the number-one cause of slow heating. Run the descaler at 60°C for best results.
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After descaling, select a 60°C cotton programme and let it run fully.
Check whether E16 appears again. If it doesn't, the descaling resolved it.
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Turn off and unplug the machine for 10 minutes.
A power reset can clear a temporary NTC sensor error that looks like a slow-heat fault.
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Check the time of year — incoming cold water in winter can cause borderline slow heating.
This isn't a fault — but if the machine is already weak, cold incoming water tips it into E16.
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If E16 returns after descaling and a reset, call a technician to test the heater and NTC.
Both components can be tested with a multimeter to confirm which one is at fault.
When to Call a Professional
Descale the machine first — this often resolves E16. If E16 returns after descaling, the heating element or NTC sensor needs testing. Full heater replacement costs $150–$350 including parts and labor. An NTC sensor replacement is cheaper: $80–$180.
Frequently Asked Questions
How often should I descale my Bosch washing machine?
In hard water areas, every 2–3 months. In soft water areas, every 4–6 months. Regular descaling prevents E16 and extends the life of the heating element significantly.
Can I use white vinegar to descale a Bosch washing machine?
Citric acid is preferred — it's more effective and safer for rubber seals. White vinegar can be used as a secondary option — run it at 60°C on an empty drum. Never use both at the same time.
What is the difference between E08 and E16 on Bosch washers?
E08 means the heater is not working at all. E16 means the heater is working but taking too long to reach temperature. E16 is usually a limescale or degrading heater issue, while E08 is a complete heater failure.