What can I check myself for Rinnai 25?

Check that the condensate pump is powered and its reservoir is not overflowing. Check that the condensate line is not blocked or frozen.

Rinnai 25 Error Code: Condensate pump (accessory)

Check a few things first. If the pump is running and the code stays, call a qualified professional.

Updated October 2026 · Sourced from Rinnai documentation

🧭 Check a few things first

The optional condensate pump has a problem. The manual says to confirm wire connections, that the reservoir is empty and that the pump is operating.

Is it safe to keep running? Check the steps below first. If the pump is running and the code stays, call a qualified professional.

Code / how it shows	Meaning	Applies to
25 Code shown on the temperature controller display	Condensate pump (accessory)	SENSEI N Series residential condensing: RU199i, RU180i, RU160i, RU130i (indoor) and RU199e, RU180e, RU160e, RU130e (outdoor)

Only steps a homeowner can do safely. Do not open electrical panels or the burner area.

If the pump is running and the code stays, call a qualified professional.
You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
Codes for flame failure, overheating, venting or the control board that return after one reset.
Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.

Write down the exact code shown on the controller or the number of status light flashes.
Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).