Rinnai water heater troubleshooting

Rinnai RES-ED440H-W water gas heater troubleshooting

ProblemCausesRemedy Methods
1. No power or power plug is not connected wellCheck electricity source and fixing plug must be good.
Indicator lamp not lighting2. Too low temperature adjustmentAdjust the temperature control to be the highest temperature.
3. ELCB not yet switch onSwitch on the ELCB
4. The interior wire material damaged
5. Indicator lamp damagedRequest to After Sales Service for repair.
6. Heating element damaged
7. Water is over heated
1. Deficient heating time.Keep on heating
No hot water coming out2. Mix water valve for hot water too lowAdjust the mixed water valve for hot water to be high.
3. Temperature-controller malfunctionRequest to After Sales Service for repair.
4. Heating element damaged
1. Water tap is turned offTurn on the water tap
No water coming out2. Water pressure is too lowAdd water pump
3. Pipe connection is not connected properlyCorrectly connect it according to diagram’s requirements
Water leakage from tank1. The various mouth’s connection are not hermetically sealedHermetically seal the connection mouth well
2. The tank leakageRequest to After Sales Service for repair.
ELCB can’t reset1. ELCB damagedRequest to After Sales
2. Electric leakageService for repair.

Rinnai REU-KA2530FFUD-US water gas heater troubleshooting

CodeDefinitionRemedy
3Power interruption during Bath Fill (Water will not flow when power returns).Turn off all hot water taps. Press ON/OFF twice.
5Bypass ServoReplace Bypass Servo
10Air Supply or Exhaust BlockageEnsure 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.
Verify dip switches are set properly.
Check fan for blockage.
Check burner and heat exchanger fins for obstructions.
For condensing models. Burner Sensor Error (see code 31)
11No IgnitionCheck 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. If flame is visible, check the flame rod circuit.
12Flame FailureCheck that the gas is turned on at the water heater and gas meter. Check for obstructions in the flue inlet or 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 Rinnai approved venting materials are used.
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.
Ensure flame rod is in proper position (wire should connect at 6 o'clock position for KA series and 12 o’clock position for KB series ).
Remove flame rod and check for carbon build-up; dean with sand paper or emery doth. Disconnect and reconnect all wiring harnesses on unit and PC board.
Check all components for electrical short.
Turn off gas, attempt to fire unit. Should unit have a code 12 there is some form of short occurring. Should the unit have a code 11 there is a combustion issue.
Check gas solenoid valves for open or short circuits.
Remove burner plate and inspect burner surface and heat exchanger fins for condensation or debris.
Check the qround wire for the PC board.
14Thermal FuseCheck 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 short-cyding.
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. Hard water must be treated to prevent scale build up or damage to the heat exchanger.
Measure resistance of safety circuit.
Ensure high fire and low fire manifold pressure is correct.
Check for improper conversion of product.
16Over Temperature WarningCheck for restrictions in the intake and exhaust system.
Check for low water flow in a circulating system causing short-cyding. Check for foreign materials in combustion chamber and/or exhaust piping. Check for blockage in the heat exchanger.
19Electrical GroundingCheck all components for electrical short.
25Condensate Trap ErrorCondensate container is full.
Check condensate drain for blockage. Replace condensate trap.
31Bumer Sensor ErrorMeasure resistance of sensor. Replace sensor.
32Outgoing Water Temperature SensorCheck sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor.
33Heat Exchanger Outgoing Temperature SensorCheck sensor wiring to be sure it has not been short circuited. Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
41Outside Temperature SensorCheck sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor.
51Inlet Water Temperature SensorCheck sensor wiring for damage. Measure resistance of sensor. Clean sensor of scale build-up. Replace sensor.
52Modulating Solenoid Valve Signal AbnormalCheck modulating gas solenoid valve wiring harness for loose or damaged terminals. Measure resistance of valve coil.
57Bumer (Bi-Metal sensors / Thermal Fuse Harness)Check for continuity through bi-metal sensors located at top of heat exchanger at white plastic connector containing red an white wires.
58Secondary Heat ExchangerThere is scale build-up in the secondary heat exchanger and it 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.
61Combustion Fan FailureEnsure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections. Measure resistance of motor winding.
Check for proper voltage from PC board.
65Water Flow ControlThe water flow control valve has failed to close during the bath fill function. Immediately turn off the water and discontinue the bath fill function. Contact a state qualified or licensed contractor to service the appliance.
70Sensor Harness ConnectionCheck PC board switches (in the bank of 6 switches. #2 should be on for indoor models and off for outdoor models on KA series units only)
Check the connection harness at the E connection on the PC board. Outdoor models should have 2 orange cables at #7 and 8 positions. Indoor models should not have cables at these positions. If this is incorrect then replace the sensor harness.
Replace PC board
71Solenoid Valve CircuitReplace PC board.
72Flame Sensing DeviceVerify flame rod is touching flame when unit fires.
Check all wiring to flame rod.
Remove flame rod and check for carbon build-up; dean with sand paper or emery doth. Check inside bumer chamber for any foreign material blocking flame at flame rod. Measure micro amp output of sensor drcuit with flame present.
Replace flame rod.
73Burner Sensor CircuitCheck sensor wiring and PC board to be sure they have not been damaged. Replace sensor.
79Water Leakage DetectedTurn off water and gas supply.
Disconnect power to the unit.
Inspect the unit for leak.
Dry area around moisture sensing element.
LCScale Build-up in Heat Exchanger (when checking maintenance code history, “00" is substituted for “LC")Flush heat exchanger. Refer to instructions in manual. Hard water must be treated to prevent scale build up or damage to the heat exchanger.
Replace heat exchanger.
NOTE: The LC code is the only 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.
FFMaintenance PerformedIndicates a service provider performed maintenance or repair. Enter this code by pressing up. down, and ON/OFF simultaneously.
No codeNothing happens when water flow is activated.On controller, verify if unit is sensing flow. If not then check the items below. If unit is sensing flow then check the heat exchanger and outlet thermistors.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Check for cold to hot cross over. Isolate circulating system if present. Turn off cold water to the unit, open pressure relief valve; if water continues to flow, there is bleed over in your plumbing. Verify you have at least the minimum flow rate required to fire unit.
Verify turbine spins freely.
Measure the resistance of the water flow control sensor.
If the display is blank and clicking is coming from the unit, disconnect the water flow servo motor.
If the display comes on then replace the water flow servo motor.

Error codes and troubleshooting