What Sensors out of sync means
The temperature sensors are out of sync (M015: off by about 3°F; M026: out of sync for at least an hour).
Also shown as: M026, M015, depending on the model.
Likely causes
- Sensor fault
Safe first checks
- Wait a few minutes to see if M015 clears.
When to stop
Balboa says call for service if it doesn't clear, and always for M026.
Parts that may help
Only order a part once the checks above point to it, and match the part number to your model.
Checked against: Balboa TP500S / TP600 system user guide (42339 rev A1): message codes; Balboa Spa Touch 3 user guide: messages. Codes can differ by model and year, so confirm with your owner's manual.
