Honeywell UDC2500 Digital Controller
Honeywell UDC2500 Digital Controller code 07: NAK, Negative Acknowledge
The addressed device cannot process the current message, which prevents the system from executing the requested action.
- Code
- 07
- Name
- NAK, Negative Acknowledge
- Controller
- Honeywell UDC2500 Digital Controller
- Type
- Communication
- What it does
- Fault: the equipment trips and stops
- Risk
- YELLOW Booth plays by its own rules
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated November 4, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- What the manual says to do, and the page it is on
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Honeywell UDC2500 Digital Controller code 07 mean?
The addressed device cannot process the current message, which prevents the system from executing the requested action.
Is Honeywell UDC2500 Digital Controller code 07 dangerous?
It is graded yellow: not hard, but a booth does it differently than the gear most techs know, so follow the checks in order.
How do I fix Honeywell UDC2500 Digital Controller code 07?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
Other Honeywell UDC2500 Digital Controller codes
01 · Illegal Function02 · Illegal Data Address03 · Illegal Data Value04 · Slave Device Failure09 · Buffer OverflowLOCK · LOCK05, 06 · Slave Device BusyPV LIM · PV LIMEE FAIL · EE FAIL
All 10 Honeywell UDC2500 Digital Controller codes · Every fault code