Truma Therme
(TT2) Water Heater
The Truma Therme is a hot water heater designed for caravans, utilizing warm air from the heating system or a 230V electric heating element to heat up to 5 liters of water. It operates in a pressure-free system and features a thermostat-controlled heating limit of 65 °C.
View official manual on manufacturer's site ↗Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
Device is not heating | No operating voltage | — | Restore power supply | DIY Safe |
Heating not working | No operating voltage. | — | Restore the power supply. | DIY Safe |
Heating time too long in 230 V operation | Heater is calcified | — | Descale the water system (see maintenance) | DIY Safe |
Does not heat up (Warmt niet op) | No operating voltage (Geen bedrijfsspanning) | — | Restore power supply (Stroomvoorziening herstellen) | DIY Safe |
Extremely long heat-up time on 230V | Scale buildup on the heating element | — | Descale water installation | DIY Safe |
Takes a very long time to heat up on 230 V | Heating element furred. | — | Descale water system (see maintenance). | DIY Safe |
230 V heating duration too long | Heating element bent | — | Descale water system (refer to "Maintenance") | DIY Safe |
Heating time during 230 V operation is extremely long | Scaling on the heating element. | — | Descale the water system according to maintenance instructions. | DIY Safe |
Heating time in 230 V operation is extremely long. | Scaling on the heating element. | — | Descale the water system (see Maintenance). | DIY Safe |
Frequently Asked Questions
Q: How do I drain the Truma Therme for winter storage?
Disconnect the water pump, open water valves in the kitchen/bathroom, and open the drain and vent valves completely to let the water empty out.
Q: Can the Truma Therme be operated without water?
No, the Therme must never be operated with electricity without water.
Q: What is the maximum operating pressure allowed for the Therme?
The Therme is meant to run unpressurised. If you connect it to a mains water supply or a more powerful pump, you must fit a pressure reducer that keeps it at or below 1.2 bar, together with a safety/drain valve.
Q: How should the Therme be filled with water?
Close the drain and vent valves completely by turning them, set the hot water tap to 'warm' (or the control knob to the red symbol in pre-mixing systems), and leave the tap open until all air is expelled from the Therme and water flows out of the taps.
Q: What should I do if there is a risk of frost?
Disconnect the power supply to the water pump, drain the water tank or remove the pump from the tank, open all water taps to 'warm', and open the drain and vent valves completely to empty the Therme entirely.