DEVI devireg 530, Инструкция по эксплуатации

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Fault: Constant heat
Relay constantly on
Measure the voltage at terminal 2 and 4, with the
temperature turned right down (that is no green light
or flashing green light). There should be no voltage at
terminal 2 and 4. If a voltage is measured, replace the
thermostat.
Floor sensor open circuit
If the floor sensor (NTC) is disconnected or open
circuited the thermostat will be constantly off (due to
the sensor interrupt, the LED will flash green).
Disconnect the external NTC sensor from terminals
5 and 6 on the thermostat.
Connect an ohm meter to the NTC sensor wire,
measuring the ohm value.
The measured value should be within specified range
according to the technical specifications.
If not, replace the NTC sensor.