Rinnai Code 61: Combustion Fan Motor Failure

Quick Answer

Rinnai Code 61 is a definitive fan motor failure, more severe than Code 63 which may involve a sensor or speed issue. Code 61 typically means the blower motor is not running at all: it has burned out, seized, or the motor drive circuit on the PCB has failed. The most common cause on units over 7 years old is motor burnout from bearing wear.

This code means your Rinnai's done heating water until you deal with it. Don't ignore it hoping it'll clear, because it won't. A dead fan motor means no combustion, full stop. If you've been sitting on a Code 63 for a while, that's basically how you got here. Wait any longer and you risk the board trying to drive a dead motor and frying the drive circuit, which turns a $150 motor job into a $500 nightmare.

RinnaiWaterheaterSeverity: highDifficulty: advanced68% DIY Success

Time to Fix

45–150 min

Difficulty

advanced

Parts Cost

$8 – $150

Tools Needed

Non-contact voltage tester, Phillips #2 screwdriver

What Does the 61 Code Mean?

OK so the combustion fan is basically the lung of your Rinnai. No spin, no burn. And Code 61 specifically means the control board tried to start that motor and got absolutely nothing back. I replaced three of these last month, all on units between 8 and 12 years old sitting in garages. Usually it's a dead motor, sometimes it's the capacitor. But start with the motor every single time.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Fan motor burned out from bearing wear or overload40%

Fan blade physically obstructed or damaged, causing motor seizure24%

Motor wiring harness burned or broken14%

PCB motor drive circuit failure preventing motor power supply12%

Run capacitor failure on single-phase fan motor10%

Symptoms You May Notice

Code 61 locked on the display and the unit refuses to fire no matter how many times you cycle the hot water tap.
Dead silence when you open a hot water tap. Normally you'd hear the fan spin up within a second or two of calling for hot water, but nothing happens at all.
A burnt plastic or electrical smell coming from the lower compartment where the fan assembly lives.
The unit was throwing Code 63 on and off for a few weeks before it finally died completely.
Scorch marks or brown discoloration around the fan housing when you pull the front panel.

Can you reset a Rinnai waterheater to clear the 61 code?

You can't reset your way out of a dead motor. Once you've installed the new part, restore power and open a hot water tap. Watch the fan through the viewing port if you can reach it, and you should hear it spin up during the pre-purge phase before ignition. If the code clears and you hear that familiar hum, you're back in business. Give it a full hot water cycle to confirm everything's stable before you call it done.

Tools Required for Diagnosis

Non-contact voltage testerPhillips #2 screwdriverFlathead screwdriverMultimeter with capacitance modeNeedle-nose pliers, insulatedFlashlight or headlampWire brush for corroded mounting screws

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Combustion Fan Motor AssemblyContact Rinnai with model number · $80–$150	Contact Rinnai with model number	$80 – $150
Run CapacitorVaries by motor specification · $8–$20	Varies by motor specification	$8 – $20

Frequently Asked Questions

How do I know if my Rinnai has Code 61 versus Code 63?

Code 63 is the warning shot and Code 61 is the kill shot. If your Rinnai was making a high-pitched squeal or grinding noise last week, that was the bearings asking for help. A 63 means the fan's struggling but still moving enough for the sensor to pick it up. A 61 means the control board tried to start the motor and got zero response. Usually, if you ignore a 63 long enough, it turns into a 61. So if you've had a 63 recently and you're reading this now, don't wait any longer.

What causes a Rinnai fan motor to burn out prematurely?

Honestly, poor venting or high static pressure is the silent killer. If the vent's restricted, the motor works twice as hard to push air through, which cooks the internal components way faster than normal. I also see a ton of failures in laundry rooms where lint gets sucked into the intake and clogs the fan blades. Keeping the air filter and intake clear is the best way to avoid a $200 repair bill. And if you're in a humid environment, the bearings corrode faster too.

Can I just replace the capacitor instead of the whole blower assembly?

Absolutely, if the capacitor's actually what failed. A run capacitor for most Rinnai blower motors runs $10-25 at any HVAC supply house or online. Just match the MFD and voltage rating printed on the label exactly, don't go up or down on MFD. If the motor windings test good and it spins freely, replacing just the cap makes total sense and saves you a lot of money. But if the bearings are shot or the windings are open, you're buying the full blower assembly, which is $120-200 depending on your model.

How much does it cost to fix Rinnai Code 61?

DIY parts: the blower assembly is $120-200, or just $10-25 for the capacitor if that's the only thing that failed. If you're paying a plumber or HVAC tech, budget $350-600 total with labor. Here's the thing though, sometimes the board is what killed the motor in the first place, and if that's the case a new motor just gets fried again. Before ordering parts, have a tech verify the voltage output at the motor connector. If the board's gone too, add another $200-400 for that.

Will Rinnai Code 61 clear itself if I just wait it out?

It won't. A dead motor is a dead motor. And waiting makes it worse. The board keeps trying to start the motor every time you call for hot water, and if the motor's seized, that repeated trying can damage the board's motor drive circuit too. Some people try hitting the blower with compressed air to free up seized bearings, and sometimes that buys a day or two. But it's just kicking the can. You need a new blower assembly, period.

Related Rinnai Waterheater Error Codes

Code: HUBRinnai Tankless Water Heater Error Codes: Complete Guide Code: 63Rinnai Code 63: Combustion Fan Error Code: 55Rinnai Code 55: Combustion Abnormality Detected Code: RESETHow to Reset a Rinnai Tankless Water Heater: All Models Guide

Same Fix on Other Brands

Navien waterheaterE110: Navien E110 Error Code: Exhaust Blockage and Venting Fault Explained

Models Known to Experience 61 Errors

This repair applies to most Rinnai waterheaters with this error code. Common model numbers include:

RUR98iN, RU199iN, RU98eN, V65iN, RL75iN, RU160iP

Written by

Raj Patel

HVAC & Water Systems Specialist · 15 years experience

Last verified for technical accuracy on March 14, 2026