On the covered Rinnai tankless water heater, 61 means a fault in the combustion fan. First, reset the water heater's power once. Then: Rinnai's checks: the motor wire harness for loose or damaged connections, the resistance of the motor wire harness, and that the combustion fan spins freely.
Differential
Likely causes of “Rinnai tankless water heater code 61”, and how to tell them apart
- 1
A loose or damaged motor wire harness
What separates it The fan does not run
How to confirm Rinnai says to check the harness
- 2
A failing fan motor
What separates it The fan is noisy or slow
How to confirm A technician tests the resistance
- 3
A fan that does not spin freely
What separates it Debris or wear
How to confirm Check that it spins freely
- 4
A blocked vent
What separates it Back-pressure on the fan
How to confirm Clear the vent
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether you hear the fan start
- Any unusual noises
Try in this order
0 of 4 completedWhat to do first
ReversibleReset the water heater's power once.
Correct only the documented fault domain
ReversibleRinnai's checks: the motor wire harness for loose or damaged connections, the resistance of the motor wire harness, and that the combustion fan spins freely.
Listen for the fan
ReversibleAt start-up.
Call a technician
ReversibleTo test the fan and harness.
Model-specific
What is true of this model and not of its siblings
- The combustion fan
- The fan pushes air through the burner and the vent. The control watches its speed, and if the speed is wrong, it stops the heater because the flame would burn badly without the right air.
- Rinnai's checks
- Rinnai lists the motor wire harness for loose or damaged connections, the resistance of the harness and a check that the fan spins freely.
- Outside the unit
- A blocked vent or a gust that reverses the airflow can also upset the fan, so look at the vent terminal.
- The fan and the flame
- The combustion fan supplies the air the burner needs and pushes exhaust out through the vent. The control counts the fan's speed signal. If the count is wrong or missing, the heater stops, because burning gas with the wrong air is dangerous.
- Sounds worth noting
- A fan that whines, rattles or grinds before the code appears is probably wearing out. A fan that is silent when the heater calls for heat has lost power or its motor has failed. Telling the technician which you heard saves time.
- Rinnai's checks
- Rinnai lists the wire harness for loose or damaged connections, its resistance and whether the fan spins freely. A fan jammed by debris or a swollen bearing will not spin freely and needs replacing.
- When the fan fails at start-up
- If you hear the heater click and then nothing, the fan never started, which points to the motor or its supply. If it spins up and then the code appears, the speed signal is wrong. The difference helps the technician decide whether to test the harness or the motor first.
- Noise as a warning
- A fan that begins to hum louder over several months is wearing out, and the code is the end of that trend. Listen to the heater at start-up now and then. If it changes in pitch or begins to rattle, have it looked at before it fails during a cold spell.
- Cold starts and the fan
- A fan that fails only on cold mornings may have a stiff bearing or a motor that is weak when the grease is cold. Note whether the code appears at the first firing of the day. That detail steers a technician towards the bearing, and the replacement fan assembly is a routine part for most models.
Stop boundary
When this stops being a self-service repair
- !Rinnai's checks are for a technician
- !Do not open the unit
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does 61 mean on a Rinnai tankless water heater?+
A fault in the combustion fan.
What does the fan do?+
It supplies air for burning gas.
Could the vent be blocked?+
Yes, check it.