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Compressor not switching off

At first the compressor did not come on at all, after bypasssing the control circuit by connecting supply voltage straight to compressor, it worked fine (I ran it for about 24 hours just to get all cold again) after that I connected everything back to normal and compressor now not switching off. Replaced thermostat, but still the same. What else could it be or could the new thermostat I bought be faulty? Please help.

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  • pierre_talja May 25, 2009

    At first the compressor did not come on at all, after bypasssing the control circuit by connecting supply voltage straight to compressor, it worked fine (I ran it for about 24 hours just to get all cold again) after that I connected everything back to normal and compressor now not switching off. Replaced thermostat, but still the same. What else could it be or could the new thermostat I bought be faulty? Please help.

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You still have the main power going to the compressor. Make sure the power goes through the thermostat before it goes to the compressor.
Check with bosch dot com for a wiring diagram, with colors and numbers.

Posted on May 25, 2009

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1 Answer

WHAT DOES THE BODY CONTROL MODULE DO ?


HVAC Compressor Controls Circuit Description
The operation of the A/C compressor clutch is controlled by the body control module (BCM) and powertrain control module (PCM). The BCM receives an a/c request signal from the heater a/c control assembly through circuit 66. The BCM then sends a class 2 serial data message to the PCM through circuit 1807. Power for the a/c compressor clutch relay is supplied by the A/C BFC fuse and circuit 439. When the PCM receives an a/c request message from the BCM, the PCM grounds circuit 459 allowing the a/c compressor clutch relay to engage. Ground for the a/c compressor clutch is supplied through circuit 450.
Do you know what a class 2 serial data message is ?
Class 2 data is a high speed data transmission. In order to control serial data line traffic, class 2 uses the peer to peer method along with message arbitration in order to manage the data line traffic. The class 2 data line includes the following control modules:
?€¢
The body control module (BCM)


?€¢
The electronic brake control module (EBCM)


?€¢
The powertrain control module (PCM)


?€¢
The sensing and diagnostic module (SDM)


You need a factory scan tool to diagnosis , it's the only way to see if transmission is sent an received !
The intake air temperature (IAT) sensor is a thermistor which measures the temperature of the air entering the engine. The Powertrain Control Module (PCM) applies 5.0 volts through a pull up resistor. When the intake air is cold, the sensor resistance is high and the PCM will monitor a high signal voltage on the IAT sensor signal circuit. As the intake air warm, the sensor resistance becomes lower causing the PCM to monitor a lower voltage. If the PCM detects an excessively high IAT sensor signal voltage (low temperature indicated), DTC P0113 will set.
Test the signal circuit of the IAT sensor for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

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Hi,I have a travel trailer 37ft. Problem with my ac, the fan starts good but my compressor does not kick on. My next door neighbour says it's the compressor that is done. Could you help me?


see this causes and fix it. God bless you
Motor Trouble Cause Diagnostic Procedure Repair Procedure Electrical Power is Off Check that all service switches for the equipment are in the "on" position.
Check for voltage at the pump motor or pump controls. If no voltage is found, check for voltage at the electric panel.
If power is on to the building, check fuse or circuit breaker serving the electric motor that won't run.
Check for local reset button on the motor (popped out = off )
Check for other power reset or power off buttons such as an access door compartment safety switch that turns off power to the equipment (found on A/C blower compartment doors)
Turn on "off" switches.
Replace bad fuse. Reset circuit breaker; if necessary replace bad circuit breaker.
Let hot electric motor cool down, then push in its reset button.
Be sure all safety interlock switches such as on compartment doors are depressed and that the doors are securely shut. Replace a bad safety switch.
See
ELECTRICAL POWER SWITCH FOR HEAT
FAN AUTO ON Thermostat Switch
WATER PUMP ELECTRICAL SWITCHES
CIRCUIT BREAKER FAILURE
ELECTRIC PANEL INSPECTION
Blown fuse, tripped breaker Replace fuse or breaker - does the pump run and keep running normally? Be sure proper breaker or fuse size in ampacity is installed - ELECTRIC PANEL INSPECTION Low voltage to the motor Check with VOM at the pressure control switch or at the motor wiring Be sure the proper size of wire is used for the ampacity and length of circuit; Test for low voltage to the building. Loose, improper, or broken motor wire Check wiring against the motor installation manual diagram, check all connections for tightness, shorts, burns, damage Rewire or repair or replace wWhen a sealed compressor motor has "burned out" this means that the internal wiring of the motor has become irreparably damaged: the compressor motor windings may be burned and shorted together or shorted to the steel shell of the motor, or the windings may have burned and simply become "open" or disconnected. If the motor has burned out in either of these ways it needs to be replaced.

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I need a wiring diagram for a 2002 Dodge neon both a/c compressor and both fan motors The a/c compressor will ot come on unless I bypasss the control relay


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bypassing relays and switch would just engage compressor and if system is low
will cause compressor failure has freon also carries a/c oil trueout system for lubrication
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We're changing a compressor and want to see relationship between the capacitor contactor and other things


The capacitor aids a unit in starting and then in running.

the contactor is a switch that tells the compressor when to come on. It is usually controlled by another voltage. So the low voltage control circuit powers a coil in the contactor, which in turn, energizes the contactor, thus closing the contacts to turn on the compressor.

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My compressor suddenly quit cycling what went wrong?


hi there!
there are several factor on cycling failure, most common on it is the pressure switch device,checking on this,plug out or switch off main circuit breaker for compressor, disconnect pressure switch if this is a single phase connection,there are two supply wire coming in and two wire coming out on pressure switch.direct connection of compressor motor on power supply to test if it is cycling manually,after direct connection of motor compressor to power supply w/out pressure switch,switch on for 5 to 10 minutes o build a low [pressure then swict off again,then switch on again even there is a low pressure observe if there is cycling motor running if this done replace pressure switch.if still have same problem motor tripping another case not to cycle bring this to electric motor service center.have a nice day dont forget to fix my rate.

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How do i connect he differenial pressure switch into the 3ph star/delta starter circuit?


Your question is a bit unclear, but I assume you are asking how to wire the pressure switch in a piston compressor.

See the diagram, below.

You should have a wire from the L1 (first incoming main voltage) terminal to the pressure switch, and from the other pressure switch terminal back to the starter coil. You will also have a wire from L2 (second main voltage terminal) to the overload, and from the other overload terminal to the other side of the coil. In this arrangement, the motor starter coil must be rated at the SAME VOLTAGE as your incoming power.

This diagram works the same for single phase machines (they just don't have the third wire coming from the supply through the starter and overload to the motor.

If your machine has other safety controls (like a low oil switch), It can be wired in series with either the pressure switch or the overload.
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How do i connect the differential switch into the 3ph star/delta starter circuit?


Your question is a bit unclear, but I assume you are asking how to wire the pressure switch in a piston compressor.

See the diagram, below.

You should have a wire from the L1 (first incoming main voltage) terminal to the pressure switch, and from the other pressure switch terminal back to the starter coil. You will also have a wire from L2 (second main voltage terminal) to the overload, and from the other overload terminal to the other side of the coil. In this arrangement, the motor starter coil must be rated at the SAME VOLTAGE as your incoming power.

This diagram works the same for single phase machines (they just don't have the third wire coming from the supply through the starter and overload to the motor.

If your machine has other safety controls (like a low oil switch), It can be wired in series with either the pressure switch or the overload.


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