14
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 ashing green light). ere should be no voltage at
terminal 2 and 4. If a voltage is measured, replace the
thermostat.
Floor sensor open circuit
If the oor sensor (NTC) is disconnected or open
circuited the thermostat will be constantly o (due to
the sensor interrupt, the LED will ash 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.
e measured value should be within specied range
according to the technical specications.
If not, replace the NTC sensor.
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