How To Repair The Rinnai Water Flow Servo And Sensor

Rinnai Tankless Error Codes: How to Troubleshoot

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When your Rinnai tankless water heater has a problem, an error lawmaking is shown on the display panel. Frequently, there'southward a few steps you tin can take to troubleshoot the issue, you lot may even be able to get your tankless back up and running. Just at blank minimum, you'll have an thought of the problem earlier you call for repairs.

Rinnai has been manufacturing tankless h2o heaters for a long fourth dimension and it'due south fair to assume that there have been changes over the years. This makes your owners transmission your best resource for troubleshooting your unit. It'll have the information yous need for your specific model.

Error Codes for Rinnai Tankless Water Heaters

A Word of Warning: We recommend contacting a professional to do the repairs for you lot. A licensed professional with experience working on tankless water heaters will accept the necessary tools and cognition to properly diagnose the trouble.

If your unit is nether warranty, doing the work yourself, or disassembling your unit could void your warranty.

Two plumbers standing in front of their van

Error Code 02

No Burner Functioning During Freeze Protection Mode

If your tankless is displaying and mistake code 02, you'll demand to call a professional.

Error Code 03

Ability Break During Bath Fill up

If in that location was a power outage or interruption its possible that one time the power is restored the water won't flow. When this happens, try the following:

Close off all the hot water fixtures in your house.
On the temperature controller, printing the on/off button twice.
If the error code displays again, yous'll need to telephone call a professional person.

Error Lawmaking 05

Bypass Servo

If you take bypass valves installed on your tankless water heater, you may see an error lawmaking 05.

Turn the power to the tankless off.
Turn the power to the tankless back on, and burn down the tankless up.
If the error lawmaking displays again, your bypass valve will need to be replaced.

Error Code 10

Air Supply or Exhaust Blockage

If you meet an fault code 10, check the following:

Cheque the vent system for blockages, clearance issues or any other issues that could prevent proper venting. Don't forget to bank check the vent outside.
Contact a professional person if you are unable to detect an issue with your vent. There are additional diagnostic tests that can be run.

Error Code 11

No Ignition

Circumspection: Information technology'south best to contact a professional to investigate an error code 11. There are, however, a few things you lot tin can cheque if you are comfortable dealing with gas appliances.

Bank check the gas valve at the gas meter and the tankless unit to ensure that they are turned fully on.
Check that the igniter is functioning properly.
If the igniter is properly working and the tankless is being supplied with gas, and so you demand to call a professional.

Blue gas flame in a water heater

Error Code 12

Important: At that place are 2 types of fault lawmaking 12. The following will help you lot determine which lawmaking 12 is your trouble:

While the tankless is going thru the ignition bike, look thru the view window to cheque if there's a visible flame.
If y'all wereable to see a flame in the burner box, either during operation and/or during the ignition cycle, y'all have aflame failure (gas) error code 12.This is the most common.
If you wereunable to run into a flame, you lot have anfirsthand (electrical) error code 12.
Sometimes information technology'south a challenge to determine if the fault code 12 is occurring due to gas or electric. If and so, turn off the gas and try to fire the unit on. If it displays a code 11 the problem is gas - If the code 12 displays, information technology'southward an electric short.

Flame Failure (Gas)

If the error code 12 is due to flame failure, y'all should call a qualified professional person. Never endeavor to solve this trouble yourself.

Immediate (Electric)

Depending on which Rinnai tankless model you own, you may see an error code 19 instead. Regardless, the code volition display when the h2o supply is beginning turned on.

This mistake code is an indicator that in that location'south a short circuit inside the tankless. The problem could exist in a wiring harness, featherbed valve, water flow control or another component within the DC circuit.
You lot could unplug each component individually and attempt to cycle the unit of measurement on. If the tankless cycles 3-times after unplugging a component, you'll know the problem is from the unplugged component.
However, for the average user, your best option is to contact a professional to practice the troubleshooting for yous.

Error Code 14

Thermal Fuse or Overheat

Of import: This error code should exist taken very seriously. An error code 14 indicates that your Rinnai is over heating. The effect could either be the bi-metal safety switch or the thermal fuses.

Remove the cover and look for discoloration on the surface of the heat exchanger in the area where the combustion box meets the copper section. Check the internal components in and effectually this area.

Bi-Metal Switches

The thermo-fuses are wrapped around the heat exchanger with the bi-metal safety switch mounted to either the top left forepart or the top correct of the heat exchanger.
In almost situations, the bi-metal switch will merely reset itself later on the unit cools. Once the switch resets, the tankless will be able to operate again.
However, if the root problem is non corrected, the bi-metal switch will continue to trip. This is because the same problem volition cause the heat exchanger to accomplish it'south hi-limit temperature range.

Thermo-fuses

The thermo-fuses are wrapped around the heat exchanger. When they blow, they will need to exist replaced. There is no way to reset these fuses.
If your thermo-fuses blow, it'southward generally best to telephone call a professional to replace them. The heat exchanger volition need to be removed, and the tankless should have a detailed inspection.

Error Code xvi

Over Temperature Alarm

An error code 16 means that the tankless shutdown to protect itself from harm. It's sensors recorded the room temperature to be above 104 degrees Fahrenheit for more than x minutes.

Alert: Although at that place are a few things that you can cheque before calling for service, only a professional person should do any repairs to the electrical or gas organisation.

Check that the air filter is clean and in good repair. Specifically wait for clogging.
Check that the required clearances surrounding the tankless accept been met and maintained.
Check outside where the vent terminates. There should be no obstructions.

Error Code nineteen

Electrical Grounding

An error lawmaking 19 indicates that there's an electrical brusque in one of your components. In nearly cases, it'due south best to telephone call a professional to troubleshoot this issue.

Man wearing glasses with magnifying glass

Fault Code 25

Condensate Trap is Full

There's a number of issues that could be causing an mistake code 25.

Check that the condensate drain line is not blocked.
Open up the cabinet and bank check that the condensate tank and trap are not blocked.
Check that the air gap between the condensate bleed line and the unit of measurement has been maintained.
Audit the sensor wiring harness. Expect for loose, damaged or cleaved connections between the PC board and the sensor.
Replace the sensor if the tank is properly draining, but you are still seeing an fault code 25.

Error Code 31

Burner Thermocouple

If your Rinnai tankless throws and mistake code 31, yous should contact a professional to inspect your unit'south gas system.

Error Code 32

Outgoing Water Temperature Thermistor Fault

An error lawmaking 32 often ways that the sensor is faulty and needs to be replaced. A professional will demand to do the repairs to get your tankless back up and running.

Mistake Lawmaking 33

Heat Exchanger Outgoing Thermistor

In virtually cases, it's typically best to contact a professional to troubleshoot this error code. They'll have the training and tools to find and resolve the trouble.

Although, if you are comfortable, yous could drain down the tankless and remove and check for lime calibration build-up on the thermistor.

Error Code 34

Combustion Air Temperature Thermistor

This error code will but display on indoor tankless models. If you run into an error code 34, you lot should contact a professional person to troubleshoot and make repairs.

Man shoveling snow

Fault Code 41

Freeze Protection Sensor

This error lawmaking volition but display on outdoor models. If the outside air temperature thermistor is disconnected or open, the tankless will display an fault code 41 and alternating to the fix point temperature.

In the above senerio, the unit will continue to operate. Once the root problem has been repaired, the error lawmaking will clear. A few other things to check are listed below:

Notation: When the freeze protection sensor /thermistor is shorted, damaged or unplugged,some models will let the tankless to burn down-up and will immediately wink an error code 41. While others volition fire-up and then alternate between an error code 41 and the temperature ready betoken.
Inspect the sensor wiring harness. Wait for broken, damaged or loose connections betwixt the PC board and the sensor.
Check that the sensor is not covered with insulation and that it is open up to the air outside.
Contact a professional.

Error Code 51

Inlet Water Temperature Sensor

The Rinnai Tankless will display an error code 51 if the the inlet water temperature thermistor is disconnected or open. The display will alternating betwixt a lawmaking 51 and the temperature set point.

If you have a code 51 result, the unit volition continue to operate. However, the code will keep to display until the underlying cause has been resolved.

Contact a professional person to troubleshoot and repair the problem.

Mistake Code 52

Modulating Solenoid Valve Abnormal

Contact a professional to troubleshoot and repair an error code 52.

Error Lawmaking 57

Burner Overheat Bi-Metallic Switch

There are ii bi-metals located on the rear of the burner assembly. If one of these ii opens, your unit will display an fault lawmaking 57. The tankless may or may not be operating when this code is displaying.

The lawmaking volition continue to display until the trouble is repaired. Once repaired, a hard reset (turn the ability off to the unit and and so back on) will need to be performed for the lawmaking to cease displaying.

Tool belt with plumbers tools

Fault Code 58

Secondary Heat Exchanger Sensor

An error code 58 displays if the secondary oestrus exchanger has one of the two bi-metals open. The tankless may or may non exist operating when the code is showing. The code will not terminate displaying until the problem is resolved and a difficult reset has been performed.

Although, the problem could be related to the wiring between the sensor and the PC board, at that place is a take a chance that you can fix this problem yourself.
When yous receive a lawmaking 58, your secondary heat exchanger needs to exist flushed due to scale build-up, and has shut down to prevent damage.
If you live in an expanse with hard h2o, you should use a water softner to help protect your tankless h2o heater.
Flush your tankless by post-obit the directions in your manual, or read our commodity to learn how.
After flushing, perform a hard reset by turning the power off and back on to the unit. If the error lawmaking does not disappear, you should call for service.

Error Code 61

Combustion Fan Motor

This error code should be resolved by a professional as they will need to measure the winding resistance of the fan motor. However, there are a few things that you can cheque.

Important: Close off the power to the tankless water heater before proceeding.
The problem could exist electrical. Cheque the wiring harness between the PC lath and the fan motor. Look for loose, broken or damaged connections.
With the power off, remove the fan motor. Check that the blower wheel is turning freely.
Audit the fan housing. Look for debris or other obstructions that could prevent the fan bike from turning.
If the fan wheel is spinning freely and there are no obstructions, you should call a professional person to troubleshoot and repair your tankless.

Fault Code 63

Apportionment Flow Rate Dropped Beneath i.iii GPM

If your Rinnai throws an mistake code 63, many people only cull to call for service instead of troubleshooting the upshot themselves. Withal, there are a few things you lot tin cheque if you lot are a DIY kind of person.

Check if the tankless is producing a water menstruum using the temperature controller by pressing the "Upwardly" button for three seconds so the "ON/OFF" button. The number displayed will exist your menses charge per unit. (ie. vii = 0.7 gpm, 25 = 2.5 gpm).
If the period charge per unit was below 1.3 gpm, bleed the air from the pump and organisation tank.
Remove and clean the inlet water filter.
Check that the water supply to the tankless is at a catamenia rater of half-dozen gpm or college.
Bank check that the inlet h2o pressure level to the tankless is between 30 to 50 psi.

Water flowing into a glass

Error Code 65

Water Flow Servo

Earlier calling for repair, check to meet if the code resets when you perform a hard reset, by shutting the ability off to the h2o heater and then plough it back on.

If the code reappears, the h2o flow servo valve did not close during the bath fill up function. Shut off the water flow and telephone call a professional to troubleshoot the trouble for you.

Fault Code 70

PC Board Fault

Contact a professional to troubleshoot and supervene upon the PC Board.

Error Code 71

Solenoid Valve Fault

An mistake code 71 means that ane of your solenoid valves has failed. In that location are 4 solenoid valves (SV0, SV1, SV2 and SV3), and a number of unlike issues that could be causing this fault lawmaking.

A professional person can troubleshoot the problem and make the repairs safely and efficiently.

Error Code 72

Flame Sensing Device Mistake

Although we recommend having a professional work on this problem for you, there are a few things you can cheque yourself.

Warning: Close off the gas, water, and electrical supply to the tankless water heater before proceeding.
Inspect the wiring harnesses from the flame rods to the PC board. Look for broken, damaged or loose connections.
Check that the flame rod is touching flame when the unit fires.
Remove the flame rod. Wait for carbon build-upward. Clean if needed.
Audit the inside burner. Look for debris build-up which could cause the flame rod to short out.
Check that the flame rod is maintaining at to the lowest degree a 1 micro amp output.

Fault Code 73

Burner Thermocouple Mistake

When your unit of measurement displays an fault code 73, you should phone call a professional for repair. They may demand to supersede the burner thermocouple and possibly even the PC board.

Error Lawmaking 79

H2o Leakage Detected

If you're comfortable doing some troubleshooting, you may be able to determine the trouble yourself. If the issue is the heat exchanger and/or the internal piping, you'll most likely need to call a professional. However, if the consequence is the sensor, you may be able to gear up it yourself.

Inspect the wiring harness on the leak detector. There may exist damaged or loose wires.
Audit the heat exchanger and all the internal piping within the tankless. Look for leakage.
If you don't detect any leakage, look within the chiffonier. Specifically check the bottom pan of the tankless for signs of pooling h2o.
If you notice evidence of water pooling, dry out off the leak sensor as well as the within of the cabinet. Restart the tankless.
If you were not able to find evidence of water pooling within the cabinet, disconnect the sensor and burn the tankless.
If the tankless operates without the sensor in place, the sensor volition need to be replaced.

Water faucet with a no sign

No Error Lawmaking

Water Flow is Activated, but Nothing Happens

If your water heater isn't working, but it doesn't throw an mistake code, there are a few things it could be. Bank check the following before calling for service:

Remove and make clean the water inlet filter.
If yous merely installed your tankless, cheque that the hot and cold water lines are correctly fastened. If the lines are reversed, the unit will not work.
Cheque that the minimum flow rate is reached. If you are non coming together the minimum flow rate the unit of measurement will not fire.
Check that the h2o menstruum control turbines are not obstructed. They should spin freely.

Lawmaking LC, LC0 - LC9

Scale Build-upwards in Heat Exchanger

Your tankless should go along to work when information technology throws an mistake code LC, LC0 - LC9, although some newer units may shut down to foreclose harm.

If it continues working, your controller volition beep to alert you to the issue, and i of the LC codes will alternate with the temperature on the display.

You should affluent your tankless every bit presently equally possible to prevent impairment to your rut exchanger. Check your owners manual for directions, or we have listed the procedure here.

Code FF

Serviceman has Serviced Production

Either maintenance or repair has been conducted on your unit when a code FF is used.

After making repairs to your tankless, the technician will enter a lawmaking FF. This alerts the arrangement that whatever codes that occur after the FF code was entered occurred upon completion of the repairs.

It'south a bit like drawing a line to assist keep runway of the error codes. One case of its employ is if the aforementioned mistake code occurs after the code FF was entered, the technician will know that the repairs made did not solve the problem.

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