What does Sequence Comm Error mean on a Sullair compressor?
Short answer: Multi-compressor sequencing communication lost. If your Sullair Touch Screen (STS) is showing Sequence Comm Error, 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?
Communication has failed between compressor controllers set up for sequential (lead/lag) operation, due to a cable/connection fault or mismatched sequence settings.
Which machines show this?
current-generation Sullair stationary rotary screw compressors — the LS-series and related packages built from the late 2010s onward — fitted with the 10-inch Sullair Touch Screen (STS) controller. The STS spells out problems as plain-English named faults and warnings ('High Temperature 1', 'Failed to Unload', 'Replace I/O Battery') rather than bare code numbers, and pairs them with live readings and a Recommended Service screen that tracks filter and separator hours. Warnings keep the machine running; faults shut it down until reset. Practical tip: before clearing anything, photograph the fault screen and the Recommended Service page — the service-hour counters usually point straight at the consumable that caused the trip.
What causes it?
- Communication cable between sequenced compressors loose or damaged
- Sequence settings mismatched between controllers
- A one-off glitch a power-cycle clears
Can you fix it yourself?
Usually, yes — check the cable at both ends, match the sequence settings across the chain, and power-cycle once. Most cases end there.
Step by step — what to try, in order:
- Check that the communication cable between compressors is connected at both ends
- Verify the sequence settings match on all compressors in the chain
- Power-cycle the controllers once if settings and cabling look correct
When do you need a technician — and why?
A persisting error needs the cabling tested or replaced by your distributor — intermittent comm faults need proper cable testing, not guesswork.
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 Sequence Comm Error mean on a Sullair Touch Screen (STS)?
Multi-compressor sequencing communication lost. Communication has failed between compressor controllers set up for sequential (lead/lag) operation, due to a cable/connection fault or mismatched sequence settings.
Can I fix Sequence Comm Error on a Sullair Touch Screen (STS) myself?
Usually, yes — check the cable at both ends, match the sequence settings across the chain, and power-cycle once. Most cases end there.
When does Sequence Comm Error on a Sullair Touch Screen (STS) need a technician?
A persisting error needs the cabling tested or replaced by your distributor — intermittent comm faults need proper cable testing, not guesswork. Call your distributor if the error persists — cabling may need to be tested or replaced.
Verified against service documentation: Sullair Touch Screen (STS) documentation for Sequence Comm Error (sullair.com)