Remote controller does not power on or display is blank, but unit has power

Safety first: Turn OFF power before working on low-voltage wiring to avoid short circuits.

Steps to check:

• Inspect remote cable: Verify the cable is securely connected at both the remote controller and the heater's control board.
• Check for damage: Look for cuts, staples through the cable, or crushed sections.
• Polarity: Ensure wires are connected to the correct terminals (+/-) as specified by Rinnai.
• Test with another controller: If available, connect a known-good remote to determine if the issue is with the controller or wiring.

When to call a professional: If the remote still does not power up, a technician may need to replace the remote controller or main control board.