Self-Test Of The Electronics; Automatic Fault Analysis - Dometic RH330LD Service Instruction

When operated, the electronic measures the temperature of the indoor air
sensor (NTC) and controls depending on this, the heating efficiency of the
absorber with the help of the HiPro-Electronic .
19.2

Self-test of the electronics

After switching on the supply voltage (Hardware- Reset) the software
carries out a selftest, in which the value of resistance of the NTC-sensors
(air-sensor, evaporator sensor) are measured.
In case the value of the resistance measuring is not corresponding
to the values of resistance fixed by the software, an error is
signalized.
Air-Sensor
The air-senosr is mark with
a red point!

Automatic fault analysis

19.3
The type of error is signalised through “n” flashing impulses of the inner
lighting (P_LIGHT) as well as REDDOT_LED with a frequency of 0.5 Hz, as
shown in the following table:
Type of error
general error electronic, power supply
everything OK / no poti connected
everything OK / poti connected
error NTC- Air-Sensor
error NTC- Evaporator-Sensor
error NTC- Air-Sensor + Evaporator Sensor
With the help of a reset you can see the fault signal (n) again.
In case an error is recognised (n>2), the temperature adjustment will not be
started, and the heating element will not be switched on.
The inner lighting and the “Red-Dot” will flash with ca. 4 Hz.
Evaporator-Sensor
Number of flashing impulses
28
n = 0
n = 1
n = 2
n = 3
n = 4
n = 5