52
E73
E73: NTC 2 Error
E73
NTC 2 (Inlet Control Thermistor) open, Wiring or Electronic Control Board defective.
E74
E74: NTC 2 Error
E74
NTC 2 (Inlet Control Thermistor) short, Wiring or Electronic Control Board defective.
Checks to perform:
WARNING
Check that all the connectors are correctly
inserted.
Measure the value of the NTC 2
between terminals of J4-3 and J4-4
wiring connector. Is the resistance
value between 49 KΩ to 63.7 KΩ
at 20 °C to 25 °C? (See Fig. 1)
Y
E
S
Check / Replace the wiring and repeat the diagnostic
cycle to check for any further alarms.
Unplug the connector and measure
directly on the NTC 2 terminal. Is
the resistance value between 49
KΩ to 63.7 KΩ at 20 °C to 25 °C?
(See Fig. 2)
Check / Replace the wiring and repeat the diagnostic
cycle to check for any further alarms.
NO
NO
Replace the Electronic Control Board and repeat the
diagnostic cycle to check for any further alarms.
Y
E
S
NO
Replace the NTC 2 and
repeat the diagnostic
cycle to check for any
further alarms.
Is wiring between Electronic Control Board
and NTC 2 (Inlet Control Thermistor) connected
properly?
Troubleshooting Based on Alarm Codes
Y
E
S