| E736 | Abnormal operation: cascade communication
| Call Pipecraft Plumbing [303-478-3829] |
| 02 | No burner operation during freeze protection mode | Call Pipecraft Plumbing [303-478-3829] |
| 03 | Power interruption during bath fill
(Water will not flow when power returns)
Turn off all hot water taps. Press ON/OFF twice. | Call Pipecraft Plumbing [303-478-3829] |
| 05 | By-Pass Flow Control
| Call Pipecraft Plumbing [303-478-3829]
Measure resistance or voltage values of the by-pass flow control.*
Replace By-Pass flow control device. |
| 07 | Circulation Flow Rate has dropped below 2.1 gpm
Not enough hot water is being called for, increase hot water flow at fixture. | Call Pipecraft Plumbing [303-478-3829]
|
| 10 | Air Supply or Exhaust Blockage/ Condensate Trap is Full
Ensure condensate line is not blocked.
Ensure internal air filter is clean with no obstructions. (Indoor Water Heaters Only) | Call Pipecraft Plumbing [303-478-3829]
Ensure High Altitude setting. (See Parameter Settings)
Ensure Combustion air and Exhaust vents are not blocked and approved venting materials are being used. (Indoor Water Heaters Only)
Ensure vent length is within limits. (Indoor Water Heaters Only)
Check fan for debris and ensure wheel turns freely.
Verify check valve is not stuck between fan casing and burner body.
|
| 11 | No Ignition (Heater Not Turning On)
Check that the gas is turned on at the water heater, meter, or cylinder.
If the system is propane, ensure fuel is in the tank. | Call Pipecraft Plumbing [303-478-3829]
Ensure gas type and inlet gas pressure are correct.
Bleed all air from gas lines.
Check the ground wire for the PC Board.
Ensure flame rod wire is connected.
Ensure igniter is operational.*
Check gas solenoid valves for open or short circuits.*
Verify gas orifice is correct.
Ensure condensate line is not blocked.
|
| 13 | No Flame
Check that the gas is turned on at the water heater, gas meter, or cylinder.
If the system is propane, ensure fuel is in the tank. | Call Pipecraft Plumbing [303-478-3829]
Ensure flame rod wire is connected.
Ensure gas type and inlet gas pressure is correct.
Bleed all air from gas lines. |
| 14 | Thermal Fuse Activated/Heat Exchanger Overheat
Check for restrictions in air flow around unit and vent terminal. | Call Pipecraft Plumbing [303-478-3829]
Measure resistance or voltage of Overheat Switch.*
Check heat exchanger surface for hot spots which indicate blockage due to scale build-up.
Refer to instructions in manual for flushing heat exchanger. Hard water must be treated to prevent scale build up or damage to the heat exchanger.
Ensure it is not in forced Hi setting. |
| 15 | Venturi Control | Call Pipecraft Plumbing [303-478-3829]
Ensure the Venturi motor is operating correctly.*
Replace gas valve assembly.
Clear diagnostic code by resetting the main power supply to the water heater. |
| 16 | High Outgoing Temperature
Safety shutdown because water heater is too hot. | Call Pipecraft Plumbing [303-478-3829]
Confirm fan motor is functioning correctly.
Replace the gas valve assembly. |
| 17 | Venturi Blockage
First, follow the recommended solutions for Diagnostic Code 10.
Check that nothing is blocking the flue inlet or exhaust.
Check all vent components for proper connections. | Call Pipecraft Plumbing [303-478-3829]
If the Code 10 solutions do not correct the problem, ensure the Venturi is not
blocked.
Please call Rinnai technical department. |
| 19 | Electrical Grounding
| Call Pipecraft Plumbing [303-478-3829]
Check all components for electrical short. |
| 21 | Data Transfer Error | Call Pipecraft Plumbing [303-478-3829]
If the PCB has been replaced, ensure the data transfer process has been
completed. |
| 25 | Condensate Pump (Accessory)
| Call Pipecraft Plumbing [303-478-3829]
Confirm wire connections and harness are good.
Ensure condensate reservoir is empty and condensate pump is operating. |
| 30 | Flammable Vapors Detected | Call Pipecraft Plumbing [303-478-3829] |
| 31 | Burner Sensor Error | Call Pipecraft Plumbing [303-478-3829]
Measure resistance of sensor.
Replace sensor.
|
| 32 | Outgoing Thermistor | Call Pipecraft Plumbing [303-478-3829]
Check sensor wiring for damage.
Measure resistance or voltage of sensor.*
Clean sensor of scale build-up.
Replace sensor. |
| 33 | Heat Exchanger Thermistor | Call Pipecraft Plumbing [303-478-3829]
Follow the steps above for Code 32 for troubleshooting |
| 34 | Combustion Air Temperature Sensor
Fault | Call Pipecraft Plumbing [303-478-3829]
|
| 35 | Tank Temperature Sensor | Call Pipecraft Plumbing [303-478-3829]
|
| 38 | Exhaust Thermistor | Call Pipecraft Plumbing [303-478-3829]
Check sensor wiring for damage.
Measure resistance or voltage of sensor.*
Replace sensor. |
| 41 | Freeze Protection Thermistor | Call Pipecraft Plumbing [303-478-3829]
Follow the steps above for Code 38 for troubleshooting. |
| 51 | Inlet Thermistor | Call Pipecraft Plumbing [303-478-3829]
Check sensor wiring for damage.
Measure resistance or voltage of sensor.*
Clean sensor of scale build-up.
Replace sensor. |
| 52 | Gas Valve | Call Pipecraft Plumbing [303-478-3829]
Check flame rod and wire for damage.
Check gas solenoid valve for open or short circuit.*
Replace gas valve assembly.
Please call Rinnai technical department |
| 54 | High Exhaust Gas Temperature | Call Pipecraft Plumbing [303-478-3829]
Ensure Heat Exchanger fins are clean and not blocked.
Confirm inlet water temperature is not too high.
Clear diagnostic code by resetting the main power supply to the water heater.
Ensure condensate is not blocked. |
| 55 | See ‘SS’ Service Soon | Call Pipecraft Plumbing [303-478-3829]
|
| 57 | Burner Overheat Bi-Metal Switch | Call Pipecraft Plumbing [303-478-3829]
|
| 58 | Secondary heat exchanger Sensor | Call Pipecraft Plumbing [303-478-3829]
Scale build-up in the secondary heat exchanger must be flushed to prevent damage. Refer to the flushing instructions in the manual. Hard water must also be treated to prevent scale build-up or damage to the heat exchanger.
|
| 61 | Combustion Fan | Call Pipecraft Plumbing [303-478-3829]
Check the motor wire harness for loose or damaged connections.
Measure the resistance or voltage of the motor wire harness.*
Ensure the combustion fan spins freely.
|
| 63 | Recirculation Low Flow | Call Pipecraft Plumbing [303-478-3829]
Ensure the inlet water filter is clean and free of debris.
Ensure Parameter setting are correctly set for recirculation mode.
Ensure Pump supply voltage.
Ensure air is removed from the recirculation line. |
| 65 | Water Flow Control
The water flow control valve has failed to close during the bath fill function.
Immediately turn off the water and discontinue the bath fill function. | Call Pipecraft Plumbing [303-478-3829]
Measure resistance or voltage values of the water flow control.* |
| 70 | PC Board | Call Pipecraft Plumbing [303-478-3829]
Replace PC Board
|
| 71 | Solenoid Valve Circuit | Call Pipecraft Plumbing [303-478-3829]
Ensure dip switch on PC board is in the OFF position.
Ensure gas control wire is not loose or damaged.
Ensure heater circuit is not grounded.
Replace PC Board. |
| 72 | 72 Flame Rod | Call Pipecraft Plumbing [303-478-3829]
Check flame rod and wire for damage.
Verify HEX is not leaking. |
| 73 | Burner Sensor Circuit
Error
| Call Pipecraft Plumbing [303-478-3829]
Check sensor wiring and PC board for damage.
Replace sensor.
|
| 79 | Water Leak Detected | Call Pipecraft Plumbing [303-478-3829]
Water has been detected at the bottom of the unit. Turn off water supply. Check all plumbing internally for leakage.
|
| LC + Number | Scale Build-up in Heat Exchanger (when checking maintenance code history, “00” is substituted for “LC”)
| Call Pipecraft Plumbing [303-478-3829]
Flush heat exchanger. Refer to instructions in manual.
Replace heat exchanger.
LC0~LC9 indicates that there is scale build up in the heat exchanger and that the heat exchanger needs to be flushed to prevent damage. Refer to the flushing instructions in the manual. Hard water must be treated to prevent scale build up or damage to the heat exchanger.
To operate the water heater temporarily until the heat exchanger can be flushed, push the On/Off button on the temperature controller 5 times. Repeated LC codes will eventually lockout the water heater.
Call Rinnai® technical department.
NOTE: The LC code is the only error code that will allow the unit to keep running. The display will alternate between the LC code and the temperature setting. The controller will continue to beep. The LC code will reset if power is turned off and then on. |
| SS | Service Soon (Flush Heat Exchanger)
SS os often confused with ‘55’
SS is a time-based service indicator set during installation.
SS indicates that it is time for service.
The heat exchanger should be flushed to prevent damage. Hard water must be treated to prevent scale build-up or damage to the heat exchanger.
To reset the SS code, push the On/Off button on the temperature controller 5 times in 5 seconds.
* See “Electrical Diagnostics” on Technical Data Sheet located on inside front cover of water Heater. | Call Pipecraft Plumbing [303-478-3829]
|
| FE | | Call Pipecraft Plumbing [303-478-3829] |
| FF | Maintenance Indicator
Placeholder in Diagnostic code history indicating that a service provider performed maintenance or service. | Call Pipecraft Plumbing [303-478-3829]
Enter this code after performing service by pressing (Up), (Down) and On/Off simultaneously.
FF is visible on the monitor. |
| No Code | Nothing happens when water flow is activated
Verify you have at least the minimum flow rate required to fire unit. | Call Pipecraft Plumbing [303-478-3829]
Measure the resistance or voltage of the water flow control sensor.*
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed. |
