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Cold radiators or no hot water? Before you call anyone, this sheet walks through the safe, owner-level checks for combi and system boilers — no heat or hot water, low pressure, fault codes, cold radiators, a frozen condensate pipe, and exactly when to call a Gas Safe engineer. The reverse gives the two fixes you'll use most — repressurising and bleeding a radiator — plus the key pressures and how to spot carbon monoxide.

• ✓Six common faults → fixes
• ✓Repressurise step by step
• ✓Bleed a radiator properly
• ✓Key pressures & numbers
• ✓Spot carbon monoxide
• ✓When to call Gas Safe