Potterton · Assure Combi
E118 boiler fault code
Assure Combi 25/30/36
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What E118 means
System water pressure too low (below 0.5 bar)
Safe check
If the gauge reads below 1 bar, top up to about 1.5 bar using the filling loop as the user guide describes. If pressure drops again or the code stays, call a Gas Safe registered engineer.
When to contact an engineer
If pressure drops again or the code stays, call a Gas Safe registered engineer.
Safety notice
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.
Source and provenance
- Baxi Professional error-code table · Potterton Assure Combi & System (Other tab) · E118 row
professional error-code table
Official Baxi web table; revision not stated
- Potterton Assure Combi User Guide 7678847-A (22/05/2017) · Tab.9, p.21
user guide
22/05/2017 · document 7678847-A
- Potterton Assure Combi User Guide 7678847-A (22/05/2017) · Tab.10, p.22
user guide
22/05/2017 · document 7678847-A
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.
Did this fix it?
After: Repressurise the boiler