Control knobs very stiff or difficult to turn for oven or grill.

Safety first: For gas taps, any internal lubrication or replacement should be done by a qualified gas engineer. Isolate power and gas before work.

• 1. Remove knobs: Pull the control knobs straight off the spindles.
• 2. Clean fascia: Wipe away grease and debris from around the spindle openings.
• 3. Inspect knobs: Replace any melted or distorted knobs with Rangemaster originals.
• 4. Light lubrication (electric selector only): For electric selector switches, a tiny amount of suitable electrical lubricant on the spindle (not inside the switch) can ease movement.
• 5. Gas taps: If a gas tap is stiff, have it serviced or replaced by a Gas Safe engineer; do not attempt to dismantle it yourself.