Technical Bulletin
Identification:
Bulletin no:
Date:
Issuer:
Factory:
All cooling equipment
VTX2004-08
11-11-04
Customer Support Dept.
Villotta (Italy)
ELECTROLUX PROFESSIONAL p. 1 of 4
Subject:
How to check if a PROBE is working or not
Model:
All appliances.
Problem:
The display doesn’t show any temperature or a wrong
temperature.
Reason:
The probe is bad connected or out of service
Action in
Factory:
All the appliances are tested at the end of the product line
before packaging.
Action in
Field:
The service should be able to do a quick diagnostic and
understand if the probe has faulted or not (
see details below).
W H A T T O D O
check the electrical connection into the
electrical box;
check if the dgt (or electronic) control has
a good connection to the power supply
check the resistance (Ω) of the probe with a
multimeter (values according to the
amb.temp. -see the attached table-)
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
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.)
blank (with alarm on)
wrong temperature
(with no alarms running)
DISPLAY
wrong temperature
(with alarm on)
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY
TELEPHONE: TELEFAX: E-MAIL:
+ 39 0434 637609 + 39 0434 630 472 gabriele.dal-bianco@electrolux.it
R E A S O N
bad connection
probe miscalibrated,
open-circuit in probe
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)
ELECTROLUX PROFESSIONAL p. 2 of 4
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
2K7 10K 10K SEMITEC 103AT NTC M891 22K
Temperature [°C] Ohm [Ω] Ohm [kΩ] Ohm [kΩ] Ohm [kΩ]
-40
100÷86 340÷320 196÷181
---
-30
53÷45 188÷165 115÷107
---
-20
30÷23 103÷91 70÷65 258÷247
-10
18÷13 59÷52 44÷41 144÷135
0
11÷8 36÷31 28÷26 81÷76
10
6÷4 20÷18 19÷17 50÷44
20
3.5÷3.0 13÷11 13÷11 29÷27
25
3.0÷2.5 11÷9 11÷9 23÷21
30
2.5÷2.0 9÷7 9÷7 18÷16
40 --- --- ---
12÷10
50 --- --- ---
8÷6
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).
(*) see the following table to find the probe properties.
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY
TELEPHONE: TELEFAX: E-MAIL:
+ 39 0434 637609 + 39 0434 630 472 gabriele.dal-bianco@electrolux.it
Technical Bulletin
Identification:
Bulletin no:
Date:
Issuer:
Factory:
All cooling equipment
VTX2004-08
11-11-04
Customer Support Dept.
Villotta (Italy)
ELECTROLUX PROFESSIONAL p. 3 of 4
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY
TELEPHONE: TELEFAX: E-MAIL:
+ 39 0434 637609 + 39 0434 630 472 gabriele.dal-bianco@electrolux.it
Spare prt.code Sensor type
Lenght
[mm]
Sheath
color
Use Appliance
0646738700 2K7 4000 white cell HD Cabinets
087479 10K 1500 black evaporator HD,Prostore,Roll-in cabinets
087480 10K 2000
black
white
condenser
ambient
HD,Prostore,Roll-in cabinets
087832 10K Semitec 103AT 4000 grey
cell
evaporator
HD Cabinet
Roll-in
087487 10K 2500 black evaporator HD Cabinets 2d
087692 10K Semitec 103AT 2000 white
cell
evaporator
HD Counters, Prostore, BC&F
BC&F (6-15-28-56-100kg)
087699 10K Semitec 103AT 1500 brown evaporator HD Counters, BC&F
088443 10K 1000
black
white
condenser
ambient
HD Counters
088066 10K Semitec 103AT 4000 white cell HD,Prostore,Roll-in cabinets
087654 10K Semitec 103AT 2000 white
cell
evaporator
HD Counters,Prostore,SB,Roll-in cabinets
HD&SB Cabinets
087958 NTC M891 22K 2500 neutral cell bain-marie Hot SelfService
088039 10K Semitec 103AT 900 black condenser Cold SelfService
088011 10K Semitec 103AT 3900 gray cell and well Cold SelfService
088040 10K Semitec 103AT 900 black display Cold SelfService
088041 10K Semitec 103AT
3800
3200
brown
white
cell evaporator
display evaporator
Cold SelfService
088182 10K Semitec 103AT 3200 black
well
evaporator
Cold SelfService
BC&F 7-10kg
087959 NTC M891 22K 1600 neutral
well bain-marie
temperated glass top
Hot SelfService
088183 10K Semitec 103AT 4300 brown
cell evaporator
cell
Cold SelfService
SB Counters
088308 10K Semitec 103AT 3200 white display evaporator Cold SelfService
088345 10K Semitec 103AT
2000
800
black
white
condenser
ambient
BC&F
088278 NTC M891 22K 2500 neutral
bain-marie
temperated glass
bridge
Hot SelfService
088322 NTC M891 22K
2500
1500
neutral temperated glass top Hot SelfService
088405 10K Semitec 103AT 3000 black
cell
evaporator
SB cabinet (-2)
SB Counters and HD Cabinets
0646759500 NTC M891 22K
1500
2000
neutral temperated glass top Hot SelfService
099267 10K Semitec 103AT 1500 brown evaporator Prostore freezer
Technical Bulletin
Identification:
Bulletin no:
Date:
Issuer:
Factory:
All cooling equipment
VTX2004-08
11-11-04
Customer Support Dept.
Villotta (Italy)
ELECTROLUX PROFESSIONAL p. 4 of 4
VIA 1° MAGGIO, 2 – 33089 VILLOTTA (PN) – ITALY
TELEPHONE: TELEFAX: E-MAIL:
+ 39 0434 637609 + 39 0434 630 472 gabriele.dal-bianco@electrolux.it
Appliances with SMART electronic:
when the display shows wrong temperatures or nothing, remember to check also the cable and the
connector between the user and the main-board (and the power supply connection).
Others probes actually used by our appliances are the following:
Spare prt.code Sensor type Lenght [mm] Sheath color Use Appliance
085961 PTC 2500 black cell and evaporator
BC 7-10-20-40Kg USA Elux
BC 43kg
0A9600 PTC 2500 gray cell BCF 43kg
088439 Shibaura PT312 1600
well bain-marie dry heating
Hot SelfService
Because of they have a different sensor, remember that the above information are not yet valid.
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