Tankless Ont. CA. 1-888-301-3337.

Temperature Controller   

Diagnostic Use of the Controller 1. To display error codes, press the ON/OFF button followed by the thermostat button to cycle through the error codes.

2. To display the water flow through the water heater, press the thermostat button (hold for 2 seconds) and then press the ON/OFF button while continuing to hold the thermostat button.

3. To display the outlet water temperature, press the thermostat button (hold for 2 seconds) and then press the ON/OFF button while continuing to hold the thermostat button. To Change the Temperature Scale (ºF / ºC) With the water heater turned off, press and hold the ON/OFF button until the display changes to the other temperature scale (about 5 seconds). To Turn Off the Controller Sound (Mute) To turn the sound off (mute), press and hold both the and thermostat buttons until a “beep” is heard (about 5 seconds).

Gas Pressure Setting

NOTE: For additional installation and commissioning information refer to the Operation and Installation Manual.

WARNING

This appliance must be installed, serviced and removed by a trained and qualified person. During pressure testing of the consumer piping, ensure gas valve is turned off before unit is shut off. Failure to do so may result in serious injury to yourself or damage to the unit.

Commissioning With all gas appliances in operation at maximum gas rate, the flowing inlet pressure at the incoming test point on the Rinnai water heater should read 5" W.C. - 10.5" W.C. on natural gas and 8" W.C. - 13.5" W.C. on propane gas. If the pressure is lower, the gas supply is inadequate and the unit will not operate to specification. Check the gas meter regulator and pipework for correct operation/sizing and correct as required.    This info is for licensed gas technicians only, if you are not a gas service person do not open this unit, period.

Trouble shooting

Important Safety Notes There are a number of live tests that are required when troubleshooting this product. Extreme caution should be used at all times to avoid contact with energized components inside the water heater. Only trained and qualified service technicians should attempt to repair this product. Before checking for resistance readings, disconnect the power source to the unit and isolate the item from the circuit (unplug it). Heat Exchanger and Outgoing Water Temperature Thermistors: Check all thermistors by inserting meter leads into each end of the thermistor plug. Set your meter to the 20 K scale and read resistance. Appying heat to the thermistor bulb should decreaase the resistance. Applying ice tothe thermistor bulb should increase the resistance. Frost Protection: This unit has frost protection heaters mounted at different points to protect the water heater from freezing. Amp Fuses: This unit has one inline (5) amp glass fuse. Remove the fuse and check continuity through it. If you have continuity through the fuse then it is good. Otherwise the fuse is blown and must be replaced. Flame Rod: Place one lead of your meter to the flame rod and the other to ground. With the unit running you should read between 5-150 VAC. Set your meter to the amp or greater for proper flame circuit. In the event of low flame circuit remove the flame rod and check for carbon or damage.

These models have a default maximum temperature setting of 120ºF (49ºC). The maximum temperature setting can be increased to 140ºF (60ºC) by setting dip switch 6 to ON in the SW1 bank of 8 dip switches. Adjust switches 2 and 3 in the bank of 8 depending on your altitude according to the table below. For licensed gas techs only.

Warning

DO NOT adjust the other dip switches unless specifically instructed to do so. Incorrect Dip Switch Settings can cause the Rinnai water heater to operate in an unsafe condition and may damage the water heater and void the warranty.

Adjustment for long flue length: 1. Determine theequivalent length using the formula: Equivalent length = Straight lengths + [no. of 90º elbows x 6] (Two 45º elbows = one 90º elbow) 2. If the equivalent length is greater than 21 ft then move switch no. 1 to OFF. If the equivalent tength is longer than 41 ft the heater may not work properly. The installer should be called.

Gas Pressure Setting

Ensure gas pressure check under Commissioning has been completed first! The regulator is electronically controlled and factory pre-set. Under normal circumstances it does not require adjustment during installation. Make adjustments only if the unit is not operating correctly and all other possible causes for incorrect operation have been eliminated. 1. Turn OFF the gas supply. 2. Turn OFF the 120 V power supply. 3. Remove the front panel from the appliance. 4. Check the gas type using the data plate on the side of the unit. If using a spare PC board, check that the gas type switches are in the correct position (dip switch 1 of SW2: ON for natural gas, NG, and OFF for propane, LPG). See dip switch settings section below. (ON is towards the right and OFF is towards the left.) 5. Attach the pressure gauge to the burner test point, located on the gas control (Fig. 2). 6. Turn ON the gas supply. 7. Turn ON the 120 V power supply. 8. If a controller is installed, turn the unit ON with the controller. Select the maximum delivery temperature and open all available hot water taps at full. 9. Set the unit to “Forced Low” combustion by setting No. 7 dip switch of the SW1 set to ON (Fig. 3). 10. Check the burner test point pressure. 11. Remove the rubber access plug and adjust the regulator screw on the modulating valve (Fig. 4) as required in Table 1. Replace the rubber access plug. 12. Set the unit to “Forced High” combustion by setting both No. 7 and No. 8 dip switches of the SW1 set to ON (Fig. 5). Ensure maximum water flow. 13. Check the burner test point pressure. 14. Adjust the high pressure potentiometer (POT) on the PC board as required to the pressure shown in Table 1. 15. Return the unit to normal operation by setting dip switches 7 and 8 of the SW1 set back to OFF (Fig. 6). Close all water taps. 16. Turn OFF the gas supply and 120 V power supply. 17. Remove the pressure gauge and install sealing screw. 18. Turn ON the gas supply and 120 V power supply. 19. Operate the unit and check for gas leaks at the test point. 20. Install the front panel.

Error Codes

02 No burner operation during freeze protection mode

• Service Call

03

Power interruption during Bath fill (Water will not flow when power returns) • Turn off all hot water taps. Press ON/OFF twice.

10

Air Supply or Exhaust Blockage

• Ensure Rinnai approved venting materials are being used. • Check that nothing is blocking the flue inlet or exhaust. • Check all vent components for proper connections. • Ensure vent length is within limits. • Ensure condensation collar was installed correctly. • Verify dip switches are set properly. • Check fan for blockage.

11  no ignition

Check that the gas is turned on at the water heater, gas meter, or cylinder. • Ensure gas type and pressure is correct. • Ensure gas line, meter, and/or regulator is sized properly. • Bleed all air from gas lines. • Verify dip switches are set properly. • Ensure appliance is properly grounded. • Disconnect EZConnect or MSA controls to isolate the problem. • Ensure igniter is operational. • Check igniter wiring harness for damage. • Check gas solenoid valves for open or short circuits. • Remove burner cover and ensure all burners are properly seated. • Remove burner plate and inspect burner surface for condensation or debris. 11

12 Flame failure

• Check that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue outlet. • Ensure gas line, meter, and/or regulator is sized properly. • Ensure gas type and pressure is correct. • Bleed all air from gas lines. • Ensure proper Rinnai venting material was installed. • Ensure condensation collar was installed properly. • Ensure vent length is within limits. • Verify dip switches are set properly. • Ensure appliance is properly grounded. • Disconnect keypad. • Disconnect EZConnect or MSA controls to isolate the problem. • Check power supply for loose connections. • Check power supply for proper voltage and voltage drops. • Ensure flame rod wire is connected. • Check flame rod for carbon build-up. • Disconnect and re-connect all wiring harnesses on unit and PC board. • Check all components for electrical short. • Check gas solenoid valves for open or short circuits. • Remove burner plate and inspect burner surface for condensation or debris.  • Check the ground wire for the PC Board.

14  Thermal Fuse

Check gas type of unit and ensure it matches gas type being used. • Check for restrictions in air flow around unit and vent terminal. • Check for low water flow in a circulating system causing shortcycling. • Ensure dip switches are set to the proper position. • Check for foreign materials in combustion chamber and/or exhaust piping. • Check heat exchanger for cracks and/or separations. • Check heat exchanger surface for hot spots which indicate blockage due to scale build up. Refer to instructions in manual for flushing heat exchanger. • Measure resistance of safety circuit. • Ensure high fire and low fire manifold pressure is correct. • Check for improper conversion of product.  

16 Over Temperature Warning

Check for restrictions in air flow around unit and vent terminal. • Check for low water flow in a circulating system causing shortcycling. • Check for foreign materials in combustion chamber and/or exhaust piping. • Check for clogged heat exchanger.

31 Burner Sensor Error

• Measure resistance of sensor. • Replace sensor

32 Outgoing Water Temperature Sensor Fault

• Check sensor wiring for damage. • Measure resistance of sensor. • Clean sensor of scale build up. • Replace sensor.

33 Heat Exchanger Outgoing Temperature Sensor Fault

• Check sensor wiring for damage. • Measure resistance of sensor. • Clean sensor of scale build up. • Replace sensor.

34 Combustion Air Temperature Sensor Fault

• Check for restrictions in air flow around unit and vent terminal. • Check sensor wiring for damage. • Measure resistance of sensor. • Clean sensor of scale build up. • Ensure fan blade is tight on motor shaft and is in good condition. • Replace sensor.

52 Modulating Solenoid Valve Signal Abnormal

• Check modulating gas solenoid valve wiring harness for loose or damage terminals. • Measure resistance of valve coil.

61 Combustion Fan Failure

• Ensure fan will turn freely. • Check wiring harness to motor for damaged and/or loose connections. • Measure resistance of motor winding.

65

 Water Flow Servo Faulty (does not stop flow properly)

If blank screen is present on remote control then the flow control has shorted out. Unplug flow control. If remote lights up and unit starts operating then replace flow control assembly.

71 

SV0, SV1, SV2, and SV3 Solenoid Valve Circuit Fault

• Replace the PC Board.

72 Flame Sensing Device Fault

Ensure flame rod is touching flame when unit fires. • Check all wiring to flame rod for damage. • Remove flame rod and check for carbon build-up; clean with sand paper. • Check inside burner chamber for any foreign material blocking flame at flame rod. • Measure micro amp output of sensor circuit with flame present. • Replace flame rod.

73 Burner Sensor Circuit Error

• Check sensor wiring and PCB for damage. • Replace sensor

LC

Scale Build-up in Heat Exchanger (when checking maintenance code history “00” is substituted for “LC”)

• Flush heat exchanger. Refer to instructions in manual. • Replace heat exchanger.

No Code (Nothing happens when water flow is activated.)

• Clean inlet water supply filter. • On new installations ensure hot and cold water lines are not reversed. • Check for bleed over. Isolate unit from building by turning off hot water line to building. Isolate the circulating system if present. Open your pressure relief valve; if unit fires, there is bleed over in your plumbing. • Ensure you have at least the minimum flow rate required to fire unit. • Ensure turbine spins freely. • Measure the resistance of the water flow control sensor. • Remote control does not light up but you have 12 VDC at the terminals for controls.