What the manual says
Manufacturer manualPurging the hot water circuit: The function is activated in the small hot water circuit for 4 minutes and then in the heating circuit for 1 minute. The pump runs and stops at regular intervals. If required, this function can be manually switched off.
From this model's manual
Verified against the Glow Worm Betacom4 installation & service manual, page 31.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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