What does PR XDCR FAULT mean on a Sullair compressor?
Short answer: Pressure transducer fault. If your Sullair ShopTek Controller is showing PR XDCR FAULT, the controller has logged a specific, documented condition. This page covers what it means, what causes it, what you can safely fix yourself, and when — and why — it takes a technician.
What exactly is the machine telling you?
The pressure transducer has failed or a connection has come loose, and the compressor shuts down because the controller cannot read system pressure.
Which machines show this?
Sullair's ShopTek line of smaller shop-duty rotary screw compressors — the ST-series packages aimed at garages, tire shops, and light manufacturing — with the compact ShopTek controller. Its display is terse: faults appear as short all-caps messages such as HIGH DISCH TEMP, PR XDCR FAULT, RTD FAULT, and A-O SEPARATOR, mixing hard shutdowns with service reminders in the same format. Discharge temperature warns above 225 °F and shuts down at the set limit. Practical tip: on these units learn which messages are reminders (A-O SEPARATOR is a service interval, not a failure) and which are trips — resetting a reminder without doing the service just deletes your warning, not the problem.
What causes it?
- Pressure transducer failed
- A connection come loose — sometimes just a momentary one
Can you fix it yourself?
Sometimes — a locked-out look at the transducer connector and one reset covers the loose-plug case.
Step by step — what to try, in order:
- With power locked out, visually check the transducer connector for looseness or damage
- Reset and restart once to rule out a momentary loose connection
When do you need a technician — and why?
A returning fault needs the transducer tested and replaced — the compressor shuts down because the controller cannot read system pressure at all.
If it does come to a service call and you're in Nashville, TN or Birmingham, AL, we maintain independently compiled lists of local companies that service industrial air compressors — real businesses with verified contact information, none of whom paid to be listed.
Related questions
What does PR XDCR FAULT mean on a Sullair ShopTek Controller?
Pressure transducer fault. The pressure transducer has failed or a connection has come loose, and the compressor shuts down because the controller cannot read system pressure.
Can I fix PR XDCR FAULT on a Sullair ShopTek Controller myself?
Sometimes — a locked-out look at the transducer connector and one reset covers the loose-plug case.
When does PR XDCR FAULT on a Sullair ShopTek Controller need a technician?
A returning fault needs the transducer tested and replaced — the compressor shuts down because the controller cannot read system pressure at all. Call service to test and replace the pressure transducer if the fault returns.
Verified against service documentation: Sullair ShopTek Controller documentation for PR XDCR FAULT (best-aire.com)