Unit displays Code 29 and may shut down during operation, especially in cold weather

Safety first: Turn OFF power and gas. Condensate is mildly acidic; use gloves and eye protection.

Steps to check:

• Inspect condensate neutralizer: On condensing Rinnai models, locate the neutralizer cartridge. Check for saturation or blockage. Replace if the media is exhausted or clogged.
• Check drain line: Ensure the condensate drain hose is free of kinks and obstructions and terminates at an approved drain point.
• Protect from freezing: In cold climates, insulate the drain line or route it indoors to prevent freezing.
• Reset and test: After clearing and/or replacing the neutralizer, restore power and gas and reset the unit.

When to call a professional: If Code 29 continues, a technician should verify condensate flow, neutralizer sizing, and vent configuration.