Boiler locks out more often in very cold weather, with visible condensate issues

Safety: Take care when working outside in icy conditions. Surfaces may be slippery.

User actions:

• Inspect the external condensate pipe for ice build-up. Thaw gently using warm (not boiling) water or warm cloths.
• Once thawed, reset the boiler and observe operation.
• If the pipe repeatedly freezes, arrange for a permanent upgrade.

Engineer actions:

• Increase condensate pipe diameter and improve insulation in accordance with Keston and regulatory guidance.
• Reduce external pipe length where possible and reroute internally if feasible.
• Clean the condensate trap and check for correct fall to the drain.