Danfoss EFET 130 Instruction page 8

Thermostat output: (terminal 1 & 2)
Measure the voltage at terminal 1 & 2, (activated thermostat,
red light). The reading should be the same as previously
measured at terminal 3 & 4.
If the reading is ok, continue to the next step, if not – replace
the thermostat.
Heating cable: (terminal 1 & 2)
Disconnect the heating cable from terminal 1 & 2 on the
thermostat.
Measure the resistance in the heating cable with an ohm
meter, it is now possible to calculate the installed wattage,
using the formula below:
2
U 2
230
P = = W (at 230 V~)
=
R
R
External sensor input: NTC – only for EFET 130 and
EFET 132
Disconnect the external NTC sensor at the terminal NTC, on
the thermostat.
Connect an ohm meter to the NTC sensor, measuring the
ohm value.
8