Remote controller for Noritz water heater is unresponsive or displays no information, while the heater itself appears to operate.

Safety first: Turn OFF power before working on low-voltage wiring.

Steps to check and correct:

• Check remote cable connections: Remove the remote from the wall and verify the cable is firmly attached. At the heater, ensure the cable is properly landed on the remote terminals.
• Inspect cable for damage: Look for pinched, cut, or stapled-through cable along its route. Replace if damaged.
• Verify polarity: Ensure the + and - conductors are not reversed between the remote and heater.
• Test with spare remote: If available, connect a known-good Noritz remote to determine if the original is faulty.
• PCB check: If wiring and remote are good, the PCB remote interface may be defective and require replacement by a technician.