HVACopedia

Rinnai · technician tips

Rinnai service menus, test modes and resets

35 tips for air handler, boiler, combi boiler, tankless water heater, wall furnace: access codes, button combinations, test modes and the resets you need at the appliance.

Jump to: Access & passwords (6) · Button combinations (8) · Service & test modes (5) · Reset & cancel (6) · Settings shortcuts (7) · Commissioning (3)

Access & passwords

Installer and service menu codes, and how to get into them.

Enter the Installer menu (password)

Air handler · Canadian Air Handler

Password-protected menu for changing operating parameters.

  1. Enter the password with the buttons in this order: down, center, up, center.
  2. Up/down change menu, line or value; center selects or validates.

Applies to: Rinnai Canadian hydronic air handler (CAH)

Source: Rinnai Canadian Air Handler Installation and Operation Manual (600000023), Software Settings p.41-42. Written in our own words; check the manual for your exact model.

Enter the Troubleshoot menu (password)

Air handler · Canadian Air Handler

Password-protected menu that shows operating parameters, reached from the Configuration menu.

  1. From the Configuration menu open Troubleshoot.
  2. Enter the password with the buttons in this order: down, center, up, center.

Applies to: Rinnai Canadian hydronic air handler (CAH)

Source: Rinnai Canadian Air Handler Installation and Operation Manual (600000023), Software Settings p.41-42. Written in our own words; check the manual for your exact model.

Open the installer level (code C123)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

The Control Tower hides installer chapters behind an access code. Once entered, PARA, SERV and the rest become available; the control drops back to user level after 20 minutes without a key press.

  1. Hold MODE for 5 seconds until COdE shows
  2. Use + and - to dial C123
  3. Press STORE to confirm

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.56 (10.1). Written in our own words; check the manual for your exact model.

Open the parameter settings menu on the PC board

Boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Installer menu for changing boiler parameters; only change what an instruction tells you to change.

  1. Remove the front panel; the PC board is at the lower left.
  2. Press and hold the left SW1 button for 5 seconds.
  3. Use the up and down arrows to scroll to the parameter, then press Select.
  4. Change the value and press Select to store it.
  5. Press the left SW1 button to leave the menu.

Applies to: Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), Code 540 steps 2-5 p.31. Written in our own words; check the manual for your exact model.

Open the parameter settings menu on the PC board

Combi boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Installer menu for changing boiler parameters; only change what an instruction tells you to change.

  1. Remove the front panel; the PC board is at the lower left.
  2. Press and hold the left SW1 button for 5 seconds.
  3. Use the up and down arrows to scroll to the parameter, then press Select.
  4. Change the value and press Select to store it.
  5. Press the left SW1 button to leave the menu.

Applies to: Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), Code 540 steps 2-5 p.31. Written in our own words; check the manual for your exact model.

Enter installer parameter mode (A button on the PC board)

Tankless water heater · SENSEI RX / CX

Parameter mode changes numbered settings such as max temperature, recirculation mode, pump speed and the Service Soon interval.

  1. Press the A button on the PC board for 1 s
  2. Pick the setting number with the controller up / down arrows
  3. Press On/Off on the controller to step through the option letters (01A, 01b...)
  4. Press the A button 1 s again to exit

Applies to: SENSEI RX and CX series tankless

Source: Rinnai SENSEI RX technical guide (en-CA), Parameter settings. Written in our own words; check the manual for your exact model.

Button combinations

Key presses that open menus, show readouts or switch modes.

View the last nine error codes (DHW + Up)

Boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Shows the stored error history on the I-Series Plus controller.

  1. Hold the DHW button for 2 s, then press Up as well (both together).
  2. Repeat the same press to exit.

Applies to: I-Series Plus Solo (heat-only) boilers IP060S, IP090S, IP120S, IP150S, IP175S, IP199S

Source: Rinnai Troubleshooting I-SERIES Plus Boiler Diagnostic Codes (800000375), PC Board Buttons table (code 520) p.30; Appendix F p.58; code 710 p.40. Written in our own words; check the manual for your exact model.

View the last nine error codes (DHW + Up)

Combi boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Shows the stored error history on the I-Series Plus controller.

  1. Hold the DHW button for 2 s, then press Up as well (both together).
  2. Repeat the same press to exit.

Applies to: I-Series Plus Combi boilers IP060160C, IP090099C, IP090160C, IP090199C, IP120199C, IP150199C, IP175199C, IP199199C

Source: Rinnai Troubleshooting I-SERIES Plus Boiler Diagnostic Codes (800000375), PC Board Buttons table (code 520) p.30; Appendix F p.58; code 710 p.40. Written in our own words; check the manual for your exact model.

Lock or unlock the controller (key symbol)

Tankless water heater · SENSEI RX/CX, SENSEI

While locked, the set temperature cannot be changed; RX/CX outdoor units lock themselves after 30 minutes without use.

  1. To lock: press and hold Priority, then press Up as well until a beep sounds (about 5 seconds), and let go of both together.
  2. To unlock: repeat the same steps.

Applies to: Rinnai SENSEI tankless (RU, RUR, RSC, CU) and SENSEI RX/CX (RX, RXP, CX, CXP)

Source: Rinnai N-Series Residential (100000467) / with Pump (100000508) / Commercial (100000504) / RSC SENSEI (100000773) Installation and Operation Manuals, 5.3.2 Locking the Controller p.68-69; Rinnai SENSEI RX Residential Installation and Operation Manual (100000839), 5.3 p.56. Written in our own words; check the manual for your exact model.

Lock or unlock the KCM controller (LOC)

Tankless water heater · KCM (RUCS/RUS)

Locking one controller locks every controller in the system.

  1. To lock: press Priority and Up together for 5 seconds; a beep confirms it.
  2. To unlock: press Priority and Up together for 5 seconds again.

Applies to: Rinnai KCM tankless with MC-601-US controller

Source: Rinnai KCM Series Manual (U328-0700X04), p.55. Written in our own words; check the manual for your exact model.

Performance data readout (items 01 to 24)

Tankless water heater · SENSEI RX / CX

Live and lifetime values: flow, temperatures, run hours, cycles, fan frequency, as numbered items on the controller.

  1. Hold the down arrow; after about 2 s also hold On/Off until 01 shows
  2. Scroll with up / down to the item wanted
  3. See the Performance data table under Settings for the item list

Applies to: SENSEI RX and CX series tankless

Source: Rinnai SENSEI RX technical guide (en-CA), Performance data. Written in our own words; check the manual for your exact model.

Show live flow and outlet temperature on the KCM controller

Tankless water heater · KCM (RUCS/RUS)

Information mode on the MC-601-US shows water flow and outgoing temperature.

  1. Press and hold Down for 2 seconds and, without letting go, press On/Off. Repeat the same press to leave.
  2. Press Up or Down until 01 shows: the water flow follows in 0.1 gal/min (58 means 5.8 gal/min).
  3. Press Up or Down until 02 shows: the outgoing water temperature follows in °F.

Applies to: Rinnai KCM tankless (RUCS65i/75i, RUS65e/75e)

Source: Rinnai KCM Series Manual (U328-0700X04), p.56. Written in our own words; check the manual for your exact model.

Show the last 9 stored codes (diagnostic history)

Tankless water heater · SENSEI RX / CX

The controller plays back the nine most recent maintenance codes one after another. LC shows as 00 in this list.

  1. Switch the heater off with On/Off
  2. Hold On/Off 2 s, then press the up arrow while still holding
  3. The codes flash in sequence
  4. Repeat the same hold to leave, then switch back on

Applies to: SENSEI RX and CX series tankless

Source: Rinnai SENSEI RX technical guide (en-CA), Diagnostic history. Written in our own words; check the manual for your exact model.

Lock or unlock the control panel

Wall furnace · EX DT

The lock indicator lights and a beep sounds when the lock is on.

  1. Press Lock to activate.
  2. Hold Lock for about 2 seconds to release; the indicator goes out and a beep sounds.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Lock p.31. Written in our own words; check the manual for your exact model.

Service & test modes

Forced fan, low and high fire, test and diagnostic modes, error history and live data.

Force the burner on for combustion checks (SERV function 1)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

SERV chapter test functions: 1 = burner at adjustable load, 2 = fan, 3 = pump, 4 = showroom mode. Function 1 is what you use for the O2 / CO2 check and the ionization reading.

  1. Enter C123, press MODE until SERV
  2. Press STEP to pick function 1
  3. Raise the load with +; hold - to go down to OFF, which ends the test
  4. Target O2 at minimum 4.4 % on natural gas, 4.8 % on propane; ionization at least 4 uA

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.58, 61-63. Written in our own words; check the manual for your exact model.

Ignition safety test (forced E02 lockout)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

Proves the flame-failure lockout works. Expect one start plus four retries, then a flashing E02.

  1. Unplug the ionization cable
  2. Start SERV function 1
  3. Wait for the start attempts to finish and E02 to flash
  4. Reconnect the cable and reset the boiler

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.63. Written in our own words; check the manual for your exact model.

Read the technical read-out and error history

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

Hold STEP 5 s to switch the display to the technical read-out (status digit left, supply temperature / water pressure right). The ERRO chapter stores the last error (Err.L) and five earlier ones (Err.1 to Err.5) with status, T1, T2, kW and pump %.

  1. Hold STEP 5 s to toggle the technical read-out
  2. For history: enter C123, press MODE until ERRO, STEP through Err.L to Err.5

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.54, 59. Written in our own words; check the manual for your exact model.

Start descaling (vinegar flush) mode on the PC board

Tankless water heater · SENSEI RX/CX

Button B on the PC board brings up dES; pressing A starts the flush cycle.

  1. Remove the front panel and locate pushbuttons A and B on the PC board (controller blank).
  2. Press B for 1 second and release when dES appears.
  3. Press A: dES starts blinking and the flush cycle is running.
  4. Circulate vinegar through the unit; the display then counts down from 60 (minutes), shows rnS (rinse), then End.

Applies to: Rinnai SENSEI RX/CX tankless (RX, RXP, CX, CXP)

Source: Rinnai SENSEI RX Residential Installation and Operation Manual (100000839), 6.3 Flushing the Heat Exchanger, Quick-Flush p.67-68; Rinnai Troubleshooting TWH Diagnostic Codes (100000652), Code 17 reset table p.29. Written in our own words; check the manual for your exact model.

Set low and high fire gas pressure with the Test Switch

Wall furnace · EX DT

PL is the low-fire setting screen and PH the high-fire one; adjust with the up and down buttons against the manometer.

  1. In the gas pressure setting procedure, press the Test Switch twice while the furnace is on: PL shows.
  2. Compare the manometer reading with the table for the gas, altitude and vent length; adjust with the up and down buttons.
  3. Press the Test Switch to move to PH.
  4. Compare the manometer reading with the table; adjust with the up and down buttons.
  5. Press ON/OFF to finish; the display goes blank and the furnace returns to normal off mode.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Gas pressure setting steps 10-11 p.26. Written in our own words; check the manual for your exact model.

Reset & cancel

Clearing lockouts, service reminders and fault history; skipping purge or de-air programs.

Reset the SERVICE reminder (8000 h counter)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

After 8000 burner hours the display scrolls SERVICE alternating with Good. The counter is reset from the SERV chapter.

  1. Enter C123, press MODE until SERV
  2. Hold STORE until SERV flashes once
  3. The hour counter returns to 8000

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.69 (13.3.1). Written in our own words; check the manual for your exact model.

Restore factory parameters (Copy)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

All parameters of the current access level go back to factory values; the display shows Copy to confirm.

  1. Enter C123 and go to the PARA chapter
  2. Press STORE (the green button) while in PARA
  3. Copy appears; the factory settings are now active

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.58. Written in our own words; check the manual for your exact model.

Venturi reset on the PC board (code 170)

Boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Holding SW2 and SW3 together shows P, then PCL on a second hold.

  1. Press SW2 and SW3 together until P appears.
  2. Hold SW2 and SW3 together a second time until PCL appears.

Applies to: Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), Code 170 step 7 p.13. Written in our own words; check the manual for your exact model.

Venturi reset on the PC board (code 170)

Combi boiler · I-Series Plus 150K and smaller, I-Series Plus 175K and higher

Holding SW2 and SW3 together shows P, then PCL on a second hold.

  1. Press SW2 and SW3 together until P appears.
  2. Hold SW2 and SW3 together a second time until PCL appears.

Applies to: Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), Code 170 step 7 p.13. Written in our own words; check the manual for your exact model.

Reset after cleaning the venturi or replacing the gas valve (codes 17 / 52)

Tankless water heater · SENSEI RX/CX, SENSEI

Step through the reset screens with button B on the PC board, then finish with A and B together.

  1. With the controller blank, press B for 1 second at a time to advance: SENSEI shows t, F, S, E; RX/CX shows dES, t, AdJ, F, A, E.
  2. E appears only while code 17 or 52 is active.
  3. Finish by pressing A and B together for 10 seconds until ECL shows.

Applies to: Rinnai SENSEI and SENSEI RX/CX tankless

Source: Rinnai Troubleshooting TWH Diagnostic Codes (100000652), Code 17 and Code 52 reset procedure p.28-29. Written in our own words; check the manual for your exact model.

Reset the Service Soon (SS) reminder

Tankless water heater · SENSEI

Clears the Service Soon reminder on the residential, pump and commercial models.

  1. Press On/Off 5 times.

Applies to: RU199i/e, RU180i/e, RU160i/e, RU130i/e

Source: Rinnai Tankless Water Heater (Residential) Installation and Operation Manual (100000467), Table 30 Parameter Settings, p.61-62. Written in our own words; check the manual for your exact model.

Settings shortcuts

Where the useful parameters live and what they are set to from the factory.

Change a parameter in the PARA chapter

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

Installer parameters live in the PARA chapter. Navigation is MODE for chapter, STEP for the item, + / - for the value and STORE to save.

  1. Enter the installer code C123
  2. Press MODE until PARA appears
  3. Press STEP to reach the parameter number
  4. Adjust with + or -, then press STORE
  5. Press MODE until StBY or Good shows to leave; it also times out after 20 min

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.56-58. Written in our own words; check the manual for your exact model.

Switch the controller between Celsius and Fahrenheit

Tankless water heater · SENSEI RX/CX, SENSEI, KCM (RUCS/RUS)

Changes the temperature units shown on the controller.

  1. With the water heater OFF, press and hold On/Off on the controller for 5 seconds.
  2. The display switches between °C and °F. Repeat to switch back.

Applies to: Rinnai SENSEI, SENSEI RX/CX and KCM tankless with a controller

Source: Rinnai N-Series Residential (100000467) / with Pump (100000508) / Commercial (100000504) / RSC SENSEI (100000773) Installation and Operation Manuals, 5.4.1 p.71; Rinnai SENSEI RX Residential Installation and Operation Manual (100000839), 5.4 p.58; Rinnai KCM Series Manual (U328-0700X04), p.55. Written in our own words; check the manual for your exact model.

Turn controller key beeps on or off

Tankless water heater · SENSEI RX/CX, SENSEI, KCM (RUCS/RUS)

Switches the beep that sounds when controller keys are pressed.

  1. Press and hold Up and Down together until a beep is heard (about 3 seconds on SENSEI and RX/CX, about 5 seconds on the KCM MC-601-US), then release.
  2. Repeat the same press to turn the beeps back on.

Applies to: Rinnai SENSEI, SENSEI RX/CX and KCM tankless with a controller

Source: Rinnai N-Series Residential (100000467) / with Pump (100000508) / Commercial (100000504) / RSC SENSEI (100000773) Installation and Operation Manuals, 5.3.1 p.68; Rinnai KCM Series Manual (U328-0700X04), p.55. Written in our own words; check the manual for your exact model.

Select remote thermostat mode (01) or control panel mode (02)

Wall furnace · EX DT

Control mode 00 is the factory default; 01 is for a wall thermostat kit (do not select without the connection parts); 02 returns to the furnace's own panel. Do not unplug the furnace within two hours of entering remote thermostat mode or it reverts to the factory default.

  1. Furnace plugged in but OFF, Set back feature OFF.
  2. Hold Economy + Up + Program for 2.5 seconds, then release: 00 shows.
  3. Press Up to move to 01 or 02.
  4. Press ON/OFF; the display goes blank and the mode is stored.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Remote thermostat p.32. Written in our own words; check the manual for your exact model.

Select the gas code (gas type, altitude, vent length)

Wall furnace · EX DT

A codes are natural gas, L codes are propane; digits 1 to 4 pick the altitude band.

  1. With the furnace off, hold the Test Switch on the PC board until it beeps.
  2. Pick the code with the up and down buttons.
  3. Press the Test Switch twice to store it; the display goes blank.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Table 8 Gas Pressure p.25-26. Written in our own words; check the manual for your exact model.

Switch the display between Fahrenheit and Celsius

Wall furnace · EX DT

Factory default is Fahrenheit.

  1. Furnace must be off.
  2. Press Timer 1 and Timer 2 together for about 5 seconds: the display shows ºC or ºF.
  3. Use the arrow keys to select the scale.
  4. Press ON/OFF to store it.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Fahrenheit or Celsius p.30. Written in our own words; check the manual for your exact model.

Turn Set back (frost protection) on or off

Wall furnace · EX DT

Set back starts heating whenever room temperature drops below the preset minimum (38 to 78 F, default 60 F); it is on from the factory.

  1. With the furnace OFF, press Set back (light comes on).
  2. Adjust the minimum temperature with the up/down buttons.
  3. Press Set back again to turn the feature off.

Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct vent wall furnaces

Source: Rinnai EX08DT/EX11DT Installation and Operation Manual (200000083) and EX17DT/EX22DT (200000084), Set back p.35. Written in our own words; check the manual for your exact model.

Commissioning

Start-up and set-up steps that are easy to miss.

Set Furnace Model after replacing the control board

Air handler · Air handler

After a control board replacement the System menu Furnace Model entry must be set to CAH050E.

  1. Open the Installer menu with the password: down, center, up, center.
  2. Go to System menu > Furnace Model.
  3. Set it to CAH050E.

Applies to: CAH050E, CAH050CE hydronic air handlers

Source: Rinnai Canadian Air Handler Installation and Operation Manual (600000023), 8.3 Controller Input Options p.40; menus p.41-42; sequence of operation p.36. Written in our own words; check the manual for your exact model.

Automatic de-aeration program (A xx, 17 min)

Boiler · E-Combi (E50CRN, E75CRN/E75CRP, E110CRN/E110CRP)

After power-up or a reset the boiler runs a 17-minute air purge, shown as A followed by the countdown. Block 85 (no flow) also triggers it. The manual gives no key combination to skip it; wait it out or power-cycle and it restarts.

  1. Display A xx = purge in progress, counting down
  2. Burner is released as soon as flow is detected during the cycle

Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP

Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.50-54, 72. Written in our own words; check the manual for your exact model.

First power-up setup: gas type and indoor/outdoor (RX/CX)

Tankless water heater · SENSEI RX/CX

At first power-up the controller asks for gas type then installation location; gas type can also be changed later with parameter 10, only within 20 minutes after power is supplied.

  1. At first power-up SEt shows and the Priority LED blinks. Press Priority: nG appears.
  2. Press On/Off to confirm natural gas. For propane, press Up or Down to change to LPG, then On/Off.
  3. To redo, press Up to go back to the first step; to accept, press Priority.
  4. The gas type can also be changed later with parameter 10, but only within 20 minutes after power is supplied.
  5. Press On/Off to confirm indoor.
  6. For an outdoor installation with the Versa-Vent outdoor vent cap, press Up or Down to change to Out first.
  7. From the In screen press Up or Down: Out appears.
  8. Press On/Off to confirm outdoor.

Applies to: Rinnai SENSEI RX/CX tankless (RX, RXP, CX, CXP)

Source: Rinnai SENSEI RX Residential Installation and Operation Manual (100000839), 4.12 Initial Settings p.46-47. Written in our own words; check the manual for your exact model.

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Rinnai error codes · Rinnai parts

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For licensed technicians. Installer menus, test modes and access codes change settings that affect safety; only use them if you are trained on the appliance and understand the result. Gas, electrical and refrigerant work must be done by a qualified, licensed person, and the manufacturer’s manual for the exact model and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.