B132A : Air conditioning circuit low pressure safety fault

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BobcatJones
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Joined: 22 Jun 2020, 13:37

B132A : Air conditioning circuit low pressure safety fault

Post by BobcatJones »

Hey all,

I'm doing some fault clearing on my 508 and I can't seem to get rid of this one on the BSI.

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B132A : Air conditioning circuit low pressure safety fault
Characterisation : Signal below the tolerance range
Status : Temporary
Location : local
Variables associated with the fault

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Can anyone help with interpretation of this? Is this a low refrigerant fault?

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GiveMeABreak
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Re: B132A : Air conditioning circuit low pressure safety fault

Post by GiveMeABreak »

Yes, this fault means there is an A/C circuit low pressure safety fault, so it has declutched the compressor for safety reasons. The signal is below the tolerance range.

Whilst this is in effect the A/C will be cut off. Your suspect areas are going to be the Air conditioning pressure sensor or the electrical harness.

BobcatJones
Posts: 10
Joined: 22 Jun 2020, 13:37

Re: B132A : Air conditioning circuit low pressure safety fault

Post by BobcatJones »

Thanks Marc,

You are really my go to at the moment :-)

Replacement of the pressure sensor would require breaking into the refrigerant circuit right?

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GiveMeABreak
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Re: B132A : Air conditioning circuit low pressure safety fault

Post by GiveMeABreak »

When the pressure of the air conditioning fluid is below 2.5 bar, the air conditioning compressor is cut off.
The air conditioning compressor is triggered again when the air conditioning fluid pressure increases to above 3 bar.

So it might be worth getting the system checked and get an A/C recharge first to see if there is a leak or it's low on refrigerant. It might just be that.

But in case you need to check the sensor, the pressostat is located here - I have marked it with a green arrow:
Pressostat.PNG