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05 astra air con fault

Hi,got an 05 petrol astra,the air con pump isnt cutting in,have had it running with a power probe,but its lost its live feed,anyone know what relay operates it?or any commomn faults?have checked all fuses,and done a continuity test on the live feed as far as the fuse box under the bonnet.be very apprciated.sam

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Hi there. The compressor will not come on unless the system is charged. There is a "low limit switch" which controls the engage voltage on the low side receiver. No charge, no engage.
Thanks
Paul

Posted on Jul 11, 2009

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Posted on Jan 02, 2017

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This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
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The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
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Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
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Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
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Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
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If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
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1 Answer

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This fault code indicates a communication error between the indoor and outdoor units; this is usually caused
by wiring errors or condensate pumps connected to the inter-connecting cable.
The communication between the units is a fluctuating DC voltage commonly called a serial signal, it can be
easily lost if the wiring is not done correctly. If there is a communication error fault CH05 will appear within 5
mins of powering up the system.
Testing
• Check Outdoor and Indoor Power Supply Voltages ( 230V ±10% ) and correct as necessary.
• Check for any mis-wiring or loose connections and correct as required.
• Check the resistance between communication line and GND. (Normal: Over 2M).
• If one Indoor unit operates normally Outdoor PCB is generally normal.
Turn on the power and start the indoor unit in cooling, set the temperature to 18ºC; the serial communication
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Set your meter to DC Volts, Test between terminals 5 (Red probe) and 2 or Earth (Black probe) of the outdoor
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If the Voltage is not present disconnect the terminal 5 cable, test the Voltage between this wire (Red probe)
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output on the Comms terminal of the Indoor unit, with the Comms wire disconnected. If No Voltage is present
the Indoor PCB must be faulty, if present, cable must be at fault. Helpful?

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