BoilerFaultCodesAriston 1 16 Fault Code
Also written as 116 — same fault.
The Ariston 1 16 fault code means: your boiler has stopped heating because the external temperature control device, typically a thermostat wired to the flooring heat system, is not communicating with or is disconnected from the boiler.. It appears on 12 Ariston models in our database.
Technical description: floor thermostat contact open
DIY fix possible
Check if your room thermostat or underfloor heating controller has power or dead batteries.Ensure the external thermostat is set to a demand temperature higher than the current room temperature.Check that any electrical switches or isolation spurs associated with your heating system have not been turned off.
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Search the official register for a qualified engineer in your area.
Gas Safe Register →Ariston models that show the 1 16 fault code
Click a model for the full fault code list and model-specific repair notes.
- Challenger 80E Repair: £120-250
- Clas HE 24 Repair: £100-200
- Clas HE 28 Repair: £100-200
- Clas HE 35 Repair: £100-200
- Clas HE Evo Repair: £120-220
- Clas Net One Repair: £120-250
- E-Combi Evo Repair: £80-180
- E-Combi One Repair: £120-250
- E-Combi One 24 Repair: £90-180
- E-Combi One 30 Repair: £120-250
- Egis Repair: £100-250
- Microsystem 15 Repair: £120-250
Source
Ariston 1 16 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026