Truma RV fault codes

Truma Combi heating/hot-water units are common in European caravans and motorhomes and increasingly in North America. Faults appear as E (error) or W (warning) codes on the control panel.

Air Conditioner

Red LED (steady)
A permanently illuminated red LED (LED 3) on the IR rece… W17A
230V mains power was interrupted and the compressor swit…

Furnace

E2H / E16H
VarioHeat ignition/flame fault: the furnace released gas… E43H
Over-voltage: the supply voltage to the heater is too hi… E44H
Under-voltage: the supply voltage to the heater is too l… E112H / E212H
Gas/flame fault group: the burner did not ignite or the … W18H
Warm-air outlet or circulated-air (return air) intake is… W25H–W29H
VarioHeat voltage and airflow warnings: W25H = overvolta…

Water Heater

E1
No flame detected. The AquaGo attempted to ignite the ga… E202H
Combi cold-weather gas fault: the gas-pressure regulatio… E211H / E212H
Gas-supply / combustion fault group on the Combi: the bu… W17H
Hot-water mode was selected while the water heater (boil… W21H
Room-temperature sensor warning on the Combi: the CP plu… W27
Water circulation pump running dry. The internal circula… W29
Excessive heat demand. The unit is running at full capac… W30
Risk of freezing. The temperature inside the AquaGo has … W31
Decalcification finished. A status message confirming th… W42H
Roof-window safety warning on the Combi: a window above … W45H
Electric (230 V) heating warning on Combi E models: the … W255H
Communication/power warning: the heater is not receiving…