BoilerFaultCodes Down draught thermostat: shut down Emergency
Your boiler has detected that hot exhaust gases are being blown back into the room instead of going up the chimney, so it has safely turned itself off to prevent poisonous fumes from building up.
Act immediately
Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now — this fault can be dangerous if ignored.
Technical description: If the temperature in the draft diverter rises above the set point (fixed at 70°C), the boiler will shut down. It automatically resets after 3 minutes, provided that the temperature also falls.
Typical repair cost £150-300 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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A boiler cover plan would cover faults like Down draught thermostat: shut down — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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