Panasonic water heater shows H19; unit may not respond correctly to remote commands.

Safety: Turn OFF power before changing DIP switches or wiring on the controller bus.

• 1. Check number of remotes: Ensure the number of connected remote controllers does not exceed Panasonic's specification.
• 2. Verify address settings:
  • Some models require setting addresses on each remote via DIP switches or menu.
  • Confirm each remote has a unique address as per the manual.
• 3. Inspect remote wiring:
  • Check for correct polarity and secure connections at each remote and at the heater.
• 4. Test with a single remote:
  • Disconnect additional remotes and test with only one connected to isolate the fault.
• 5. Replace faulty remote: If one remote consistently causes H19 when connected, replace that remote controller.