In this post, I’ll be discussing the various aspects of Rinnai M Series Condensing Boiler Error Codes in order to help you fix the problem in the easiest and quickest possible way.
I’ll be walking you through the reasons for these error codes along with the ways to fix them.
So, without any further ado, let’s begin…
The Rinnai M Series consists of wall-mounted, gas-fired combi, and solo boilers.
Below is the list of models that falls under the M-Series.
- M060C
- M090C
- M120C
- M160C
- M060S
- M090S
- M120S
- M160S
Rinnai M-Series Condensing Boiler Control Panel Features
- The boiler consists of a power button that can be switched on by pressing the “I” button and switched off by pressing the “O” button
- A selector wheel is also present on the control panel that can be turned right or left in order to scroll through the available menu option
- For going back one screen you need to press the back button
- For resetting the unit, you need to press the reset button
- You need to press the OK button to select an item
- For adjustment of high fire/low fire as well as O2 settings, you need to enter into service mode
- The boiler display button displays boiler status information
Rinnai M Series Error Codes
Let’s have a quick look at various error codes that can occur in your M Series.
Does it make sense?
Rinnai Error Code 101
The Rinnai Error Code 101 mainly occurs due to overheating of the unit. There are numerous reasons that can attribute to this problem.
Reasons
- The supply or return water temperature is more significant than 212° F for 3 seconds
- The return water temperature is within 9° F of the supply temperature for 24 hours
- The supply and return probe check failed
Location
- Central Heating Operation
How to Fix Rinnai Error Code 101
- Press the Reset button
Rinnai Error Code 102
The Rinnai Error Code 102 occurs due to pressure sensor damage.
Reasons
- The pressure sensor has a short or open circuit
Location
- Central Heating Operation
How to Fix Rinnai Error Code 102
- Troubleshoot the pressure sensor
Rinnai Error Code 103
The Rinnai Error Code 103 occurs when the flow check fails 3 times in a time span of 15 minutes.
Reasons
- Three flow checks failed within 15 minutes. 1P1 (Flow Check 1 Failed) was the last error detected
Location
- Central Heating Operation
How to Fix Rinnai Error Code 103
- Press the Reset button
Rinnai Error Code 104
The Rinnai Error Code 104 occurs when flow check 2 fails.
Reasons
- More than 27° F per second change in supply or return water temperature
Location
- Central Heating Operation
How to Fix Rinnai Error Code 104
- Press the Reset button
Rinnai Error Code 105
The Rinnai Error Code 105 occurs when flow checks fail 3 times.
Reasons
- Three flow checks failed within 15 minutes. 1P3 (Flow Check 4 Failed) was the last error detected
Location
- Central Heating Operation
How to Fix Rinnai Error Code 105
- Press the Reset button
Rinnai Error Code 106
The Rinnai Error Code 106 also occurs due to the flow check failing 3 times during a timespan of 15 minutes.
Reasons
- Three flow checks failed within 15 minutes. 1P4 (Filling Needed) was the last error detected
Location
- Central Heating Operation
How to Fix Rinnai Error Code 106
- Press the Reset button
Rinnai Error Code 107
The Rinnai Error Code 107 occurs whenever the flow check fails 3 times.
Reasons
- The return water temperature is more than 63°F higher than the supply water temperature and the burner is on
Location
- Central Heating Operation
How to Fix Rinnai Error Code 107
- Press the Reset button
Rinnai Error Code 108
The Rinnai Error Code 108 is displayed when the supply pressure is below minimum.
Reasons
- The supply pressure is below minimum pressure and the burner is on
- The burner is off with the supply pressure below the minimum pressure and deaeration is active for 40 seconds
Location
- Central Heating Operation
How to Fix Rinnai Error Code 108
- Raise the supply pressure above the minimum pressure
Rinnai Error Code 109
The Rinnai Error Code 109 is displayed when the supply pressure is above maximum pressure.
Reasons
- The supply pressure is above the maximum pressure
Location
- Central Heating Operation
How to Fix Rinnai Error Code 109
- Lower the pressure to 4.3 PSI below the maximum supply pressure
Rinnai Error Code 110
The Rinnai Error Code 110 is displayed for sending the probe damaged.
Reasons
- The supply sensor has a short or open circuit
Location
- Central Heating Operation
How to Fix Rinnai Error Code 110
- Troubleshoot the supply sensor
Rinnai Error Code 112
The Rinnai Error Code 112 will be displayed due to return probe damage.
Reasons
- The return sensor has a short or open circuit
Location
- Central Heating Operation
How to Fix Rinnai Error Code 112
- Troubleshoot the return sensor
Rinnai Error Code 114
The Rinnai Error Code 114 is displayed due to the damaged outdoor probe.
Reasons
- The outdoor sensor is installed and has a short or open circuit
Location
- Central Heating Operation
How to Fix Rinnai Error Code 114
- Troubleshoot the outdoor sensor
Rinnai Error Code 1P1
The Rinnai Error Code 1P1 is displayed due to the failing of flow check 1.
Reasons
- Change in supply temperature from 12.6°F to 27° F in one second
Location
- Central Heating Operation
How to Fix Rinnai Error Code 1P1
- The boiler will attempt to correct for 10 seconds
Rinnai Error Code 1P2
The Rinnai Error Code 1P2 occurs due to the failure of flow check 3.
Reasons
- The supply water temperature is more than 99°F higher than the return water temperature
Location
- Central Heating Operation
How to Fix Rinnai Error Code 1P2
- The boiler will attempt to correct for 1 second
Rinnai Error Code 1P3
The Rinnai Error Code 1P3 is displayed on the boiler due to the failure of flow check 4.
Reasons
- The return water temperature is 18° F higher than the supply water temperature
Location
- Central Heating Operation
How to Fix Rinnai Error Code 1P3
- The boiler will attempt to correct for 10 seconds
Rinnai Error Code 1P4
The Rinnai Error Code 1P4 is displayed on the boiler when the filling is needed.
Reasons
- Supply pressure is below the warning pressure
Location
- Central Heating Operation
How to Fix Rinnai Error Code 1P4
- Raise the supply pressure above the minimum pressure
Rinnai Error Code 201
The Rinnai Error Code 201 is displayed when combi domestic hot water NTC gets damaged.
Reasons
- The Domestic Hot Water sensor has a short or open circuit
Location
- Domestic Hot Water Operation
How to Fix Rinnai Error Code 201
- Troubleshoot the Domestic Hot Water Sensor
Rinnai Error Code 203
The Rinnai Error Code 203 is displayed on the unit when the tank NTC sensor gets damaged.
Reasons
- The tank probe has a short or open circuit
Location
- Domestic Hot Water Operation
How to Fix Rinnai Error Code 203
- Troubleshoot the tank probe
Rinnai Error Code 303
The Rinnai Error Code 303 is displayed due to the occurrence of a fault in the PCB.
Reasons
- PC board software or hardware error
Location
- PC Board
How to Fix Rinnai Error Code 303
- Press the Reset button
Rinnai Error Code 304
The Rinnai Error Code 304 occurs due to too many resets.
Reasons
- The Reset button was pressed more than 5 times in 15 minutes
Location
- PC Board
How to Fix Rinnai Error Code 304
- Wait for 15 minutes to elapse without pressing the Reset button
Rinnai Error Code 306
The Rinnai Error Code 306 is displayed due to the occurrence of a fault in the PC board.
Reasons
- PC Board error
Location
- PC Board
How to Fix Rinnai Error Code 306
- Press the Reset button
Rinnai Error Code 309
The Rinnai Error Code 309 is displayed for the failure of the gas relay check.
Reasons
- Flame detected for 3 seconds after the gas valve closed
Location
- PC Board
How to Fix Rinnai Error Code 309
- Press the Reset button
Rinnai Error Code 3P9
The Rinnai Error Code 3P9 is displayed for the scheduled maintenance call service.
Reasons
- The maintenance timer has expired
Location
- PC Board
How to Fix Rinnai Error Code 3P9
- Reset the monthly timer for the next maintenance interval reminder
Rinnai Error Code 501
The Rinnai Error Code 501 is displayed when no flame is detected.
Reasons
- Flame not detected
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 501
- Press the reset button
Rinnai Error Code 502
The Rinnai Error Code 502 is displayed when the false flame is detected, that is, the flame is detected with the gas valve closed.
Reasons
- Flame detected before the gas valve opened
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 502
- Troubleshoot the flame rod, igniter, electrode, and gas valve
Rinnai Error Code 504
The Rinnai Error Code 504 is displayed due to a flame lift issue.
Reasons
- Loss of flame during burner operation
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 504
- Press the Reset button
Rinnai Error Code 5P1
The Rinnai Error Code 5P1 is displayed due to the failure of the first ignition.
Reasons
- Flame not detected during the first ignition attempt
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 5P1
- The fault will go away at the end of the second ignition attempt
Rinnai Error Code 5P2
The Rinnai Error Code 5P2 is displayed when the flame isn’t detected during the second ignition attempt.
Reasons
- Flame not detected during the second ignition attempt
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 5P2
- The fault will go away at the end of the third ignition attempt
Rinnai Error Code 5P3
The Rinnai Error Code 5P3 is displayed due to a flame lift issue, that is, loss of flame during burner operation.
Reasons
- Loss of flame during burner operation
Location
- Flame Ignition/Detection
How to Fix Rinnai Error Code 5P3
- The fault will go away with proper ignition
Rinnai Error Code 612
The Rinnai Error Code 612 is displayed when the fan speed is either too high or too low.
Reasons
- Fan speed is too high or too low
Location
- Fan/Vent
How to Fix Rinnai Error Code 612
- Press the Reset button
Rinnai Error Code 1P9
The Rinnai Error Code 1P9 is displayed during the water pressure dynamic check and occurs when there is no pressure change even after 5 seconds of running the pump.
Reasons
- No pressure change after 5 seconds of running the pump
Location
- Central Heating Operation
How to Fix Rinnai Error Code 1P9
- The boiler will check the pressure for 30 seconds and the error will go away with proper inlet pressure
Rinnai Error Code 140
The Rinnai Error Code 140 is displayed during the water pressure dynamic check and occurs when two 1P9 water pressure check fails.
Reasons
- Two 1P9 water pressure checks failed
Location
- Central Heating Operation
How to Fix Rinnai Error Code 140
- Press the Reset button
How to Reset a Fault Code?
- Whenever an error occurs, the fault code and description appear on the display
- To reset the fault code, press the RESET button
- The following message appears:
- Do you really want to perform the reset?
- Press OK to reset the error
- Press the ESC keyboard button to cancel the reset and return to the previous screen
- Do you really want to perform the reset?
- The reset-in-progress message appears
- The fault solved message appears
- After the code is reset, the home screen automatically appears
It’s A Wrap
First and foremost, I would like to thank you for being with us till the end.
Secondly, I would like to bring to your notice that I along with my core team have put loads and loads of effort into coming up with this idiosyncratic superlative piece of information on the topic of Condensing Boiler Error Codes.
And, in case, you liked our effort and want to appreciate us then please do share this piece of information with like-minded people and the ones who are in search of a similar piece of information.
After all, sharing is caring, isn’t it?
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Cutting long-story-short, we’ve tried to inculcate all the important pieces of information that we could in order to help you make an informed decision.
That’s all, as of now:):):)
