BoilerFaultCodesIdeal Connectivity Red Fault Code
Also written as CONNECTIVITYRED — same fault.
The Ideal Connectivity Red fault code means: your thermostat has lost its wireless connection to the boiler, meaning your heating controls cannot talk to the system.. It appears on 1 Ideal model in our database.
Technical description: No connection
What causes the Ideal Connectivity Red fault?
This fault occurs when the wireless signal between your thermostat and the smart interface plugged into the boiler is interrupted or lost. The most common reasons include simple dead batteries in the wall unit, physical obstructions like new furniture blocking the signal, or radio interference from other electronic devices in your home.
DIY fix possible
Check that the internet router is switched on and functioning correctly.Ensure the Smart Interface plugged into the boiler is powered and has a light showing.Restart the Halo thermostat by removing and reinserting the batteries.Navigate to the advanced settings on the thermostat to re-pair the device to the interface.
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Gas Safe Register →Ideal models that show the Connectivity Red fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Connectivity Red fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026