20
Trouble-shooting list
Fault
Cause
Rectification
Water supply
After the heater is switched
off, the drain valve opens
(FrostControl).
Temperature at drain valve
less than approx. 3 °C.
–
Switch the heater on. If the temperature is below ap-
proximately 3 °C, the drain valve will open automati-
cally! If the heater is not in operation, the drain valve
can be reclosed only when the temperature is approxi-
mately 7 °C or higher!
Use heating element for FrostControl.
–
–
The drain valve (FrostControl)
can no longer be closed.
Temperature at drain valve
is below approximately
7 °C.
Rotary switch is not at
“Operation”.
–
–
Switch the heater on. If the heater is not in operation,
the drain valve can be reclosed only when the tem-
perature is approximately 7 °C or higher!
Turn the drain valve’s rotary switch to “Operation”,
then press the push button until it engages.
–
–
Water flows intermittently from
the FrostControl drain muff.
Water pressure too high.
–
Check pump pressure (max. 2.8 bar). If connected to
a central water supply (rural or urban connection), a
pressure reducer must be used, which will prevent
pressures higher than 2.8 bar entering the boiler.
–
If this does not solve the problem, please contact the Truma Service.
