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Bosch boiler error E9
High limit tripped. The boiler overheated: low water flow, air in the system or a failed pump.
Serious · you can check this yourself
E9
Meaning: High limit tripped
What causes E9
The boiler overheated: low water flow, air in the system or a failed pump.
What to do
Check the pressure and bleed the radiators. If it returns, call a technician.
Can I fix it myself?
You can make the first check yourself, but stop there: this code can point to a serious fault.
If the code comes back
Book a visit and add the code to the booking. A technician arrives knowing which parts to bring, diagnoses the boiler for a flat $89 and gives you an exact quote before doing any work.
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