Electrolux AOS102GBD2 User Manual

Technical Bulletin

Identification:
Bulletin no:
Date:
Issuer:
Factory:

Subject:

Model:
Problem:
Reason:
Action in

Factory:
Action in

Field:

All cooling equipment

VTX2004-08
11-11-04
Customer Support Dept.
Villotta (Italy)

How to check if a PROBE is working or not

All appliances.
The display doesn’t show any temperature or a wrong

temperature.
The probe is bad connected or out of service

All the appliances are tested at the end of the product line before packaging.

The service should be able to do a quick diagnostic and
understand if the probe has faulted or not (

see details below).

check the electrical connection into the

blank (with alarm on)

wrong temperature

(with no alarms running)

DISPLAY

wrong temperature

(with alarm on)

ELECTROLUX PROFESSIONAL p. 1 of 4
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY

TELEPHONE: TELEFAX: E-MAIL:

+ 39 0434 637609 + 39 0434 630 472 [e-mail]

electrical box;
check if the dgt (or electronic) control has
a good connection to the power supply

bad connection

check the resistance (Ω) of the probe with a
multimeter (values according to the
amb.temp. -see the attached table-)

W H A T T O D O

check the connection between the probe
and the connector of the dgt (or electronic)
control: if the terminal wirings of the probe
aren't well insulated and properly
connected, a short-circuit can happen

R E A S O N

probe miscalibrated,
open-circuit in probe

check the position of the probe; check if
the real probe position is according to its
label (def=defrost=evaporator; cell=inside
the cell; cond=condenser; etc.)

short-circuit in probe wrong installation

Technical Bulletin

Identification:
Bulletin no:
Date:
Issuer:
Factory:

All cooling equipment

VTX2004-08
11-11-04
Customer Support Dept.
Villotta (Italy)

Instruments requested for diagnostic: digital multimeter and a standard tool-box.

“Resistance – Temperature” table (*)

Appliance type Cabinet&counters, BC&F and cold self-service hot self-service

Probe type

Temperature [°C] Ohm [Ω] Ohm [kΩ] Ohm [kΩ] Ohm [kΩ]

-40

-30

-20

2K7 10K 10K SEMITEC 103AT NTC M891 22K

100÷86 340÷320 196÷181

53÷45 188÷165 115÷107

---

---

30÷23 103÷91 70÷65 258÷247

-10
0

10
20
25
30
40 --- --- --­50 --- --- ---

When ambient temperature is around 25°C, a good (10K Semitec 103AT) probe should have a
resistance around 10 kΩ, it means that the multimeter has to show a value of about 9÷11 kΩ
(according to the resolution of the instrument and to the real ambient temperature).

18÷13 59÷52 44÷41 144÷135

11÷8 36÷31 28÷26 81÷76

6÷4 20÷18 19÷17 50÷44

3.5÷3.0 13÷11 13÷11 29÷27

3.0÷2.5 11÷9 11÷9 23÷21

2.5÷2.0 9÷7 9÷7 18÷16
12÷10

8÷6

(*) see the following table to find the probe properties.

ELECTROLUX PROFESSIONAL p. 2 of 4
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY

TELEPHONE: TELEFAX: E-MAIL:

+ 39 0434 637609 + 39 0434 630 472 [e-mail]