What It Means
Communication failure between CCM controller and PC gateway.
York All Systems
York Error Code 03#
Troubleshooting guide for the York system fault 03#.
Possible Causes
- Damaged or loose communication cabling between CCM and gateway.
- Incorrect gateway baud rate or DIP-switch configuration.
- Loss of power to CCM module or network gateway.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
CCM/PC(gateway) Communication Malfunction.
All Recorded Causes
Verify Before Replacing Parts
- Confirm the exact York model family and default context before acting on a generic code description.
- Confirm board LEDs, wiring polarity, and model compatibility before replacing control boards — this York fault points at the most likely cause listed above.
- Check for intermittent communication faults caused by connectors, moisture, or damaged harnesses, and rule out the next candidate on the list.
- After the correction, run the system long enough to confirm the default fault does not return under normal load.
Not sure which system this York code is on?
ACLogics has guided diagnostics for 60 York fault codes and asks the right questions to narrow it down.
