Boiler frequently goes into frost protection mode even when the property is warm.

Safety: Ensure the boiler and pipework are protected from freezing conditions.

• Check installation location: If the CTC boiler is in a loft or garage, improve insulation and draught-proofing around the unit and pipework.
• Review frost settings: In the installer menu, verify frost protection thresholds and adjust if necessary according to the CTC manual.
• Compare sensor readings: Check internal and outdoor sensor readings against actual temperatures. Replace any sensor giving incorrect values.