Error code
Baxi Boiler E50 — Meaning and Safe Advice
Baxi identifies E50 with a short or open domestic-hot-water NTC circuit on the tank-boiler application described in its table. Use the applicable boiler-range table on the Baxi reference. An E-prefixed code is not interchangeable with every similar numeric display.
Quick answer
E50: Domestic-hot-water NTC sensor circuit fault
Meaning
Domestic-hot-water NTC sensor circuit fault
First safe check
Record the full model number and complete displayed code before attempting a remedy.
Stop if
The warning is active or recurring and the next step would require internal access.
Who to call
Contact a Gas Safe registered engineer qualified for the boiler with the model and full code. The display identifies a reported condition, not a confirmed replacement part.
Internal diagnosis and repair require a qualified professional. Follow only the model-approved user actions described below. Keep checks outside the casing and use only a manufacturer-approved reset where the manual allows it.
What does this error code mean?
Baxi identifies E50 with a short or open domestic-hot-water NTC circuit on the tank-boiler application described in its table.
A generic communication-fault description is not supported by that table.
Use the applicable boiler-range table on the Baxi reference. An E-prefixed code is not interchangeable with every similar numeric display.
Why is this happening?
- The manufacturer-reported condition is: domestic-hot-water ntc sensor circuit fault. An engineer must establish the underlying cause on the actual model.
Safe next steps
- Record the full model number and complete displayed code before attempting a remedy.
- Confirm that the manufacturer guidance below applies to that model. Do not use instructions for a different appliance or code suffix.
- Contact a Gas Safe registered engineer qualified for the boiler for diagnosis if the warning is active or recurring.
Can I fix this myself?
NoLimit your actions to the external checks and model guidance described here; internal diagnosis requires a professional.
Safety boundary: Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
What not to do
- Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
- Do not order replacement parts solely from the code or repeat resets to suppress a returning warning.
Common misdiagnoses
- A generic communication-fault description is not supported by that table.
When to call a heating professional
Contact a Gas Safe registered engineer qualified for the boiler with the model and full code. The display identifies a reported condition, not a confirmed replacement part.
Safety warning
Do not remove the boiler casing or work on gas, combustion, flue components or internal wiring.
Useful hub links
Other Baxi boiler codes
Relevant guide
Frequently asked questions
Does E50 prove that a part needs replacement?+
No. Match the model and full code first. The manufacturer definition describes the reported condition; diagnosis establishes whether a repair is needed.
Does this definition apply to every model?+
Use the applicable boiler-range table on the Baxi reference. An E-prefixed code is not interchangeable with every similar numeric display.
Sources and review status
Model dependent · Last reviewed 21 September 2026
- Baxi professional error-code reference
manufacturer support · UK · checked 21 September 2026
The code definition and stated model/region scope. A generic communication-fault description is not supported by that table.