Diagnose "Overheat Red Failure" faults - Alde 3020 EU Spec

The "Overheat Red Failure" error message will be displayed on the Standby Screen of the Alde control panel. It is the system's fallback mode, so is the most common error message. • Air is trapped in the boiler or pipes • The fluid level is too low in the expansion tank • The antifreeze solution is too weak or too strong • The circulation pump is not operating • Red sensor is defective • 12VDC supply to boiler is unstable Always replace the antifreeze with an Alde-approved product for 5 year corrosion protection, and frost protection down to -37 °C. Alde central heating and hot water systems are powered by LPG and/or electric and specially designed for caravans, motorhomes and boats. Proudly made in Sweden since 1949.