Adria boiler not producing hot water: what's going on?

Adria installs a Truma Combi in most campervans and motorhomes, a combi boiler that both heats and produces hot water. On the more expensive models and integral vehicles, there is often an Alde system (central heating boiler on gas and/or electricity) or a separate Truma boiler. The symptoms are similar: you turn on the tap, but the water remains cold or lukewarm.

Start by checking the power supply. Is the boiler switched on at 230V? Has the fuse in the campervan not tripped? If on gas: is the gas bottle open and is there sufficient pressure? Also check that the boiler is not in 'winter mode' or 'heating only', as then the water will not be heated.

Most common causes with an Adria boiler

• Faulty heating element (230V): The electric element can burn out, especially after long periods of inactivity with limescale build-up. Measuring with a multimeter will give you a definitive answer.
• Gas ignition problems: With a Truma Combi or Alde on gas, the ignition electrode may be dirty or the gas pressure too low. Sometimes the burner needs cleaning.
• Stuck safety valve: If the pressure relief valve sticks, water will leak away and the boiler cannot build up pressure. The valve is often located near the cold water inlet connection.
• Air in the system: After filling or draining, air can become trapped in the boiler. Bleed it via the valve or let the tap run for a while.
• Faulty thermostat or sensor: The boiler thinks the water is already hot and does not switch on. This is more common in older appliances.

For more background on how a campervan boiler works and why it does not produce hot water, please read our general explanation about boilers without hot water.

What does a repair cost?

A new heating element for a Truma costs roughly between 80 and 150 euros, excluding installation. A new burner or gas block can cost up to 300 to 500 euros. With an Alde system, parts are often more expensive and labour is more intensive. For a diagnosis at a dealer, expect to pay around 75 to 100 euros per hour. Sometimes the issue is solved with a simple reset or descaling, but if the circuit board or heat exchanger is broken, the bill can quickly escalate.

Are you unsure whether an expensive repair is still worthwhile? Then it might be a good time to check the market value of your motorhome. A campervan with a faulty boiler is worth less, but we would still be happy to buy it from you.