Heater shows H61; unit may continue to run but with warnings.

Safety: Turn off power. Condensate is mildly acidic; wear gloves and eye protection.

• Inspect condensate trap: Locate the condensate siphon at the base of the heater. Remove it according to the manual and check for sludge or debris.
• Clean trap: Rinse the trap with clean water until all deposits are removed. Ensure the internal water seal is intact.
• Check drain line: Follow the condensate pipe to its termination. Clear any blockages and ensure proper slope to the drain.
• Protect from freezing: If the pipe runs through unheated spaces, insulate it or reroute to prevent freezing.
• Refill siphon: Before reattaching, fill the trap with clean water to establish the seal.
• Reassemble and test: Refit the trap, restore power, and run the heater. Confirm that H61 clears and that condensate drains freely.