Treat as urgent. If gas or CO is genuinely suspected, ventilate, get out, and don't operate switches or naked flames.
What it means
Carbon monoxide is invisible, odourless and can be fatal. If this alarm sounds, it means the sensor has detected CO building up, most often from an appliance not venting properly.
What to do
- Get everyone outside into fresh air immediately.
- Turn off all gas and combustion appliances.
- Do not go back inside until the space has been thoroughly ventilated and the source identified.
- Have the heater, fridge, hob and their flues professionally inspected before using them again.
Likely causes
- A blocked or damaged exhaust flue on the heater or fridge
- An appliance not designed for the ventilation it's getting
- A generator or barbecue used too close to, or inside, the van
Rough UK cost
A professional appliance and flue inspection typically costs £60 - £200.