Potterton · Promax Combi HE Plus
E20 boiler fault code
Promax Combi 24/28/33 HE Plus A
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What E20 means
Central heating temperature sensor (NTC) fault.
Gas Safe engineer: Contact a Gas Safe registered engineer for diagnosis of this sensor fault.
A boiler fault code alone is not a gas or carbon-monoxide emergency. If you smell gas, a CO alarm sounds, anyone feels unwell, or there is an unsafe flame, leave and call 0800 111 999 from outside.
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.
Safe check
Note the code. Do not open or adjust the boiler, or repeatedly reset it. Contact a Gas Safe registered engineer.
When to contact an engineer
Contact a Gas Safe registered engineer for diagnosis of this sensor fault.
Source and provenance
- Potterton Promax Combi HE Plus A User Guide · UK Comp No 5114443 Iss 17 (4/13) · Table of Error Codes, printed p. 8 · manufacturer document, hosted by gentoogroup.com
user guide
UK Comp No 5114443 Iss 17 (4/13)