We have summarised for you which common causes can be responsible for a sauna room that is too cold.
New sauna heater but not enough heat
The electric sauna heater is new, but the sauna does not get warm enough? Then the heater's output may not have been calculated correctly. Depending on the size of the sauna cabin and the structural design, sauna heaters also differ in performance. For example, for a sauna cabin in the house with a size of 7 - 12 cubic metres, a heater with a capacity of 9 kW is recommended. If the heater has a lower output, it does not heat the cabin sufficiently or takes a long time with high electricity costs.
Sauna heater defective - sauna does not heat up properly
As a technical device, a sauna heater is not safe from defects or a total failure due to age. If the sauna heater and the sauna control unit are fully functional, then every sauna heating rod should glow during operation. If only one heating element fails, the function is clearly impaired. As these are wearing parts, they must be replaced from time to time. An electrician can measure the heating elements and thus determine whether the failure is due to this. If the sauna heater does not give any sign of life, the fuses and the RCD circuit breaker should be checked first.
Control unit or temperature sensor defective
The function of a sauna heater depends on the correct function of the control unit and the temperature sensor connected to the control unit. An incorrectly set control unit can be just as responsible for a moderately warm sauna as the failure or malfunction of the temperature sensor. If, for example, the temperature sensor transmits incorrect or no values to the sauna control unit, then the heater cannot operate correctly either. These components can be checked by a specialist, e.g. an electrician, and replaced if necessary
Dirty oven or old sauna stones
If the sauna oven is very dirty inside, it will also not be able to develop its full power. Deposits of sauna water, abrasion from the sauna stones and other dirt can significantly impair the performance of the heater. Old or incorrectly piled sauna stones are also sometimes the cause of poor heating performance. Clean the sauna heater, carefully remove deposits from the heating elements when the heater is switched off, replace old sauna stones and layer the new sauna stones correctly. This will result in a significantly better heating performance.
Incorrect ventilation or insulation
Another cause for a sauna not heating up properly can be structural or functional faults. If the ventilation system brings more cold air into the cabin than necessary, the cabin will not be able to warm up properly. Check that the sauna ventilation system is functioning properly and is correctly dimensioned. Please follow the stove manufacturer's instructions in this regard. For further information, please refer to the corresponding operating instructions. Even faulty structural insulation prevents the sauna from heating up properly.
You can find and eliminate many such sources of error yourself. However, an experienced specialist should always be commissioned for all electrical work.