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Electrics / General system
A010 - electronic thermostat
E
Testing
18.07.2001
9000
000129
E
a
2/2
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Index
Date
Version
Page
A010 - electronic thermostat
Fault location in air-conditioning
Air-conditioning compressor does not switch on
ETNum-list
PM-Picturemodule
Text-module
Note:
See also:
Chapter 5500 Reg. A - Functional description
Chapter 5570 Reg. A - Electrical check on air-conditioning
Chapter 9000 Reg. C - Electric circuit diagrams
1. Check X050, fuse F017 (UB 15) (supply for M009 - fan and A010 - electronic thermostat).
2. Supply Y024 - magnetic clutch with 12 VDC from external source (check: does magnetic clutch
operate?).
3. Check S037 - fan switch for continuity (supply to A010 - electronic thermostat. "Green telltale" ).
4. Check S035 - high-pressure/low-pressure switch for continuity (check refrigerant circuit).
5. Check all connectors for continuity.
6. Check voltage output of A010 - electronic thermostat at Y024 - magnetic clutch.
7. Check operation of B045 - sensor, B046 - sensor and S044 - potentiometer (see table above).
PMTAB_Picture
Checking performance of air-conditioning
●
Hold thermometer in fan air current and
measure air current temperature directly at air
nozzle outlet (A).
Target value: approx. 6
°
C - 8
°
C at 25
°
C ambient
temperature
Note:
Set recirculation switch to recirculation mode
to ensure optimum cooling performance.
Note:
If target value is not achieved, recirculation
filter, condenser or evaporator may be
soiled/clogged (please see Operating Manual
for details of how to clean).