Alpha · E-Tec 28/33
75 boiler fault code
E-Tec 28/33
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What 75 means
Return/flow sensor fault — possible failure of one or both sensors.
Gas Safe engineer: The code remains or returns after the step above, or no home step applies; arrange diagnosis by a Gas Safe registered engineer.
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, or someone has possible carbon-monoxide symptoms, leave and call 0800 111 999 from outside.
Safe check
Note the code shown on the display. Do not open, adjust or repeatedly reset the boiler. Contact a Gas Safe registered engineer.
When to contact an engineer
The code remains or returns after the step above, or no home step applies; arrange diagnosis by a Gas Safe registered engineer.
Renting? Report it to your landlord or housing provider first. They are responsible for gas safety and boiler repairs, and the repair should not cost you.
Source and provenance
- Alpha E-Tec 28 and 33 Installation and Servicing Instructions (Jan 2022) · §10.2 Error codes and fault finding, printed p. 48
installation and servicing instructions
Jan 2022