Rheem RTG2-42 Troubleshooting Manual
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Rheem RTG2-42 Troubleshooting Manual

Rheem RTG2-42 Troubleshooting Manual

Tankless
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Tankless Gas Water Heaters
Second Generation
Indoor, Outdoor and Direct Vent
Up to 199,000 BTU
Includes RTG2-42, RTG53, RTG66 and RTG74 models

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Summary of Contents for Rheem RTG2-42

  • Page 1 Tankless Gas Water Heaters Second Generation Indoor, Outdoor and Direct Vent Up to 199,000 BTU Includes RTG2-42, RTG53, RTG66 and RTG74 models...

  • Page 2: Table Of Contents

    Error Codes ..........................15 Diagnostic Points on Printed Circuit Board................18 Thermistor Resistance Chart..................... 19 Fan Speed Chart ......................... 20 RTG2-42............................21 Wiring Diagram ........................21 Printed Circuit Board ........................ 22 RTG 53............................23 Wiring Diagram – RTG 53 ....................... 23 Printed Circuit Board –...
  • Page 3 SVC 810 Tankless Troubleshooting Manual Troubleshooting .......................... 40 Troubleshooting Format and Example..................40 Unit Will Not Power On ......................41 Error Code 00..........................44 Warning Code 05 ........................44 Warning Code 10 ........................45 Error Code 11..........................45 Error Code 12..........................49 Error Code 13..........................
  • Page 4 Should you have any problems reading or following the instructions in the Use and Care Manual, seek the help of a licensed and qualified professional. Copyright 2008, Rheem Manufacturing Company, Water Heater Division.

  • Page 5: Specifications Common To All Product Lines

    SVC 810 Tankless Troubleshooting Manual Specifications common to all product lines Model See specification sheets for current models and specs Purpose Domestic Hot Water (DHW) supply for showers, cleaning and laundry Rated Gas Input (Btu/Hr.) See specification sheets for current models and specs Modulating Dimensions See specification sheets for current models and specs...

  • Page 6: Product (Model) History

    SVC 810 Tankless Troubleshooting Manual Product (Model) History Implementation Models Modification/Upgrade New Parts Board Date Affected Programming September 2004 RTG42 Initial Tankless Product Launch May 2005 RTG74 Initial Product Launch Dec 2006 RTG74 Gas Valve change; also included new fuel supply tubes from gas valve to burner assembly RTG74...
  • Page 7 SVC 810 Tankless Troubleshooting Manual Implementation Models Modification/Upgrade New Parts Board Date Affected Programming Flame rod and igniter on Burner right hand burner swapped; added a ‘target’ for the spark to hit Improved burner cover plate Burner cover plate New programming chip – Programming all RTG74 models.

  • Page 8: Sequence Of Operations

    SVC 810 Tankless Troubleshooting Manual Sequence of Operations Action Explanation Hot water faucet is open creating a demand Hot water draw initiates water flow thru the machine. Water flows through the Water Flow Sensor Minimum flow rate of .66 gallons per minute.

  • Page 9: Sensors And Safety

    SVC 810 Tankless Troubleshooting Manual Action Explanation (For indoor model only) When the air intake is The PC Board senses this change and blocked, or oxygen in a room is not sufficient, controls the Fan and Proportional Gas the output of the thermocouple that is located Control Valve in order to prevent imperfect in the Oxygen Depletion Sensing Burner combustion.

  • Page 10: How To Reset The Four (4) Hour Ods Timer

    SVC 810 Tankless Troubleshooting Manual Second attempt by the PCB to increase the PCB continues to try to fix the air-fuel mixture airflow rate to balance the air-fuel mixture. my adding airflow. It now adds a visual alarm on the Remote Control by flashing both the red and green indicators.

  • Page 11: Heat Exchanger Thermistor

    Maintenance Panel Display The Rheem Tankless has a Maintenance Display chart on the remote control panel. To access the Maintenance Display, turn the unit OFF. Then hold down the UP and DOWN arrow keys at the same time for a few seconds.

  • Page 12: Clearing The Fault History

    SVC 810 Tankless Troubleshooting Manual Clearing the Fault History 1. Turn the unit OFF. Remove the front cover. Locate the dip switches on the control board. 2. Make sure all the dip switches are OFF (down position). 3. Locate the #1 dip switch and turn it ON; then turn it OFF.

  • Page 13: How To Check Manifold Gas Pressure

    SVC 810 Tankless Troubleshooting Manual operating water flow. b. Push the Adjusting Button on the PC Board. [LH] is displayed on the LED of remote control. c. Hold the Adjusting Button; push the "SW1" button on the PC Board. The current number [01 - 39] is displayed on the LED of remote control.

  • Page 14: Program Chip Adjustment

    SVC 810 Tankless Troubleshooting Manual 53XP 3.46 + fan pressure (max.) 0.55 + fan pressure (min.) 53XN 2.83 + fan pressure (max.) 0.49 + fan pressure (min.) 53DVP 3.01 + fan pressure (max.) 0.37 + fan pressure (min.) 53DVN 2.95 + fan pressure (max.) 0.39 + fan pressure (min.) 74DVP 7.28 + fan pressure (max.)

  • Page 15: Changing The Maximum Temperature Setting To 140

    SVC 810 Tankless Troubleshooting Manual DIP Switch. The LED on the PCB and the display of the remote control stops illuminating. 13. Attach the unit's front cover. 14. Turn on the gas shutoff valve and water shutoff valve. 15. Check and ensure safe operation and performance of the water heater. Changing the Maximum Temperature Setting to 140 °...

  • Page 16: Error Codes

    SVC 810 Tankless Troubleshooting Manual 1. Turn off remote control. Leave the unit plugged into a 120 VAC power source. 2. Turn off the gas and water shutoff valves. 3. Remove the front cover. 4. Find the DIP Switch #4 located at the top left hand side of the PCB. 5.
  • Page 17 SVC 810 Tankless Troubleshooting Manual Ensure appliance is properly grounded. Check gas solenoid valves for open or short circuits. Check power supply for proper voltage and voltage drops. Disconnect remote control; see if it runs. Disconnect and re-connect all wiring harnesses on unit and PC board. Oxygen Depletion Sensor (Poor Ensure there is plenty of fresh air to the unit.
  • Page 18 SVC 810 Tankless Troubleshooting Manual Modulating Solenoid Valve Check modulating gas solenoid valve wiring harness for loose or Fault damaged terminals. Ohm out solenoid valve. Combustion Fan Failure Ensure fan motor will turn freely. Motor will operate with a small amount of restriction.

  • Page 19: Diagnostic Points On Printed Circuit Board

    SVC 810 Tankless Troubleshooting Manual Diagnostic Points on Printed Circuit Board Measurement Point Normal Value What you are checking? Connection Wire Color I – J AC 90 – 110V Do you have power to the control board? W1 – W2 50K Ω...

  • Page 20: Thermistor Resistance Chart

    SVC 810 Tankless Troubleshooting Manual R1 – W2 DC8 – 30V Is the thermo-electromotive force OK? (measured 2 minutes after combustion startup) 1 – 2 DC8 – 30V (measured 2 minutes after combustion startup) W1 – W2 Less than 1V DC; Is the air intake switch working? Less than 1Ω...

  • Page 21: Fan Speed Chart

    SVC 810 Tankless Troubleshooting Manual Fan Speed Chart...

  • Page 22: Rtg2-42

    SVC 810 Tankless Troubleshooting Manual RTG2-42 Wiring Diagram...

  • Page 23: Printed Circuit Board

    SVC 810 Tankless Troubleshooting Manual Printed Circuit Board...

  • Page 24: Rtg 53

    SVC 810 Tankless Troubleshooting Manual RTG 53 Wiring Diagram – RTG 53...

  • Page 25: Printed Circuit Board - Rtg 53

    SVC 810 Tankless Troubleshooting Manual Printed Circuit Board – RTG 53...

  • Page 26: Rtg 66

    SVC 810 Tankless Troubleshooting Manual RTG 66 Wiring Diagram...

  • Page 27: Printed Circuit Board

    SVC 810 Tankless Troubleshooting Manual Printed Circuit Board The RTG 66 PCB has two set of dip switches. Dip Switch set #2 controls the high altitude settings. See the use and care manual for instructions. The procedures for changing the maximum temperature set point have also changed. See the use and care manual for instructions.

  • Page 28: Error Code 11 (Rtg66 Only)

    SVC 810 Tankless Troubleshooting Manual Error Code 11 (RTG66 Only) Explanation: No ignition. This error code can be cause one three different scenarios. Please match the scenario to the fault condition before you troubleshoot. At a minimum check the following in all cases: 1.
  • Page 29 SVC 810 Tankless Troubleshooting Manual Does the Solenoid Valve #1 have a Replace Printed Circuit Board voltage? Measure the voltage of connector K between Black and White wires: 90 to 120 VDC Does the Solenoid Valve Replace Printed Circuit Board #2 have a voltage? Measure the voltage of connector K...
  • Page 30 SVC 810 Tankless Troubleshooting Manual Is the resistance of the Gas Inlet Solenoid Valve Replace Gas Control Assy Measure the resistance of connector K between Black and Yellow wires: 0.8 to 2.4k Ohms Is the resistance of the Solenoid Replace Gas Control Assy Valve #1 OK? Measure the resistance of connector K between Black and White wires:...

  • Page 31: Error Code 51 (Rtg 66 Only)

    SVC 810 Tankless Troubleshooting Manual Scenario 3 – Error Code 11; main burner ignites, but shuts off after ignition. Display maintenance information 0y Try to ignite main burner Does the 0y Clean or replace main display indicate Is there any burner and Flame Rod any remaining flame current?

  • Page 32: Error Code 61 (Rtg 66 Only)

    SVC 810 Tankless Troubleshooting Manual Does the 0y Flame Rod Status: X=not detecting flame; O=is detecting flame display indicate 0y display any remaining Flame Rod 1(white) flame? Flame Rod 1 is the white wire at connector M and goes to the burner. Normal flame rod status in the control panel with the burner on should be 01 or detecting flame.

  • Page 33: Error Code 65 (Rtg66 Only)

    SVC 810 Tankless Troubleshooting Manual The water heater appears to be normal. Attempt to operate Is there any again. pulse output Replace Fan Assembly from the Fan Motor? Is there any pulse output from the Fan Motor? To measure the pulse Replace Printed Circuit Board output, turn on the fan by pushing "MAX"...

  • Page 34: Error Code 66 (Rtg66 Only)

    SVC 810 Tankless Troubleshooting Manual Error Code 66 (RTG66 Only) Explanation: Water By-Pass Control fault. At a minimum check the following: 1. Verify there is water flow thru the unit even if the unit does not fire. 2. Access maintenance information to determine flow rate. 3.

  • Page 35: Rtg 74

    SVC 810 Tankless Troubleshooting Manual RTG 74 Wiring Diagram – RTG 74 A wiring diagram is also located on the inside of the front cover panel.

  • Page 36: Printed Circuit Board - Rtg 74

    SVC 810 Tankless Troubleshooting Manual Printed Circuit Board – RTG 74...

  • Page 37: Mic-180 & Ez Link

    SVC 810 Tankless Troubleshooting Manual MIC-180 & EZ Link There are two kinds of communications cables when manifolding multiple tankless units. If only two like units are connected together, we call that EZ Link. This process uses a single 6 foot long cable with four colored wires at each end.

  • Page 38: Error Code 03 (Mic-180 & Ezlink Only)

    SVC 810 Tankless Troubleshooting Manual Error Code 03 (MIC-180 & EZLink Only) Explanation: Manifold Control Failure. The unit has lost the communications link between itself and the MIC-180; or between the two units with EZLink. At a minimum check the following: 1.

  • Page 39: Mic 180 Maintenance Mode Table

    SVC 810 Tankless Troubleshooting Manual 4. Press the SW3 button on the main communication PCB to change to trial operation mode. The left two digits of the LED display will indicate the water heater selected and will illuminate continuously. At the same time, the LED lamp on the main communication PCB or the extended communication PCB corresponding to the water heater selected will illuminate and indicate the water heater is in trial operation mode.

  • Page 40: 2Nd Generation Flame Rod Chart

    SVC 810 Tankless Troubleshooting Manual 5. Select the type of maintenance by depressing SW2 (Group Number) and/or SW3 (Item Number) 6. The initial maintenance item is displayed on the two right digits on the display unit flashing between [Maintenance address – E1] and [Maintenance Data – the first error code]. 7.

  • Page 41: Troubleshooting

    SVC 810 Tankless Troubleshooting Manual Troubleshooting • When measuring resistance of a part, turn off the electric power and be sure to disconnect the part completely before measuring (from connector or terminal). Resistance checks are performed on the part while it is disconnected from the control board.

  • Page 42: Unit Will Not Power On

    SVC 810 Tankless Troubleshooting Manual Unit Will Not Power On Explanation: Nothing happens when water is flowing through unit. At a minimum check the following in all cases: 1. Make sure unit is connected to proper 3 prong, grounded power supply and circuit breakers are on.
  • Page 43 SVC 810 Tankless Troubleshooting Manual Is there Check fused power leads next to junction box. voltage thru the 3 amp fuses? Check and verify the fused leads next to the junction box on the black and white wires are OK. Replace with 3 amp fuses if needed.
  • Page 44 SVC 810 Tankless Troubleshooting Manual Did the Disconnect all remote unit go to controls from the PCB main and attempt to restart the burner? unit. Unit appears to be OK. Did the unit go to OK - If you gone this far, there is one more thing to check. The pick-up main sensor in the water flow control may be bad;...

  • Page 45: Error Code 00

    Unit is trying to resolve imperfect combustion. Increase fresh air to the unit. If the Rheem tankless cannot resolve the problem on its own, it will shut down with an error code of “13”.

  • Page 46: Warning Code 10

    SVC 810 Tankless Troubleshooting Manual Warning Code 10 Explanation: This is a warning code. Fan Motor is not creating enough ventilation. The venting system passed pre-purge, but has failed during normal operation. At a minimum check the following: 1. Check for blockage of heat exchanger fins. 2.
  • Page 47 SVC 810 Tankless Troubleshooting Manual Scenario 2 – Error Code 11; fan is operating; igniter does spark; main burner does not ignite. Does the Gas Inlet Solenoid Replace Printed Circuit Board Valve have a voltage? Measure the voltage of connector K between Black and Yellow wires: 90 to 120 VDC Does the...
  • Page 48 SVC 810 Tankless Troubleshooting Manual Does the P.G.F.R. valve Replace Printed Circuit Board have a voltage? Measure the voltage of connector R between Black#2 and Red#1 wires: 1.5 to 14 VDC Is the resistance of the Gas Inlet Replace Gas Control Assy Solenoid Valve Measure the resistance of connector K between Black and Yellow wires:...
  • Page 49 SVC 810 Tankless Troubleshooting Manual Is the resistance of the Replace Gas Control Assy Proportional Gas Control Valve OK? Measure the resistance of connector R between Black#2 and Red#1 wires: 40 to 80 Ohms Check or replace main burner Scenario 3 – Error Code 11; main burner ignites, but shuts off after ignition. Display maintenance information 0y Try to ignite main burner Does the 0y...

  • Page 50: Error Code 12

    SVC 810 Tankless Troubleshooting Manual Error Code 12 Explanation: Flame Failure. Unit went to main burner for a period of time; but has since lost flame or the ability to verify the presence of flame. At a minimum check the following in all cases: 1.

  • Page 51: Error Code 13

    SVC 810 Tankless Troubleshooting Manual Error Code 13 Explanation: Oxygen Depletion Sensor activated. The unit was not able to resolve an imperfect combustion issue. At a minimum check the following in all cases: 1. Check for lack of fresh combustion air such as in a tight closet. 2.

  • Page 52: Error Code 14

    SVC 810 Tankless Troubleshooting Manual g. If within 3 minutes, you get any reading, and then the reading drops below 8 mv, and then goes to Ø, then we have a problem with the ODS, a missing sensor damper or the burner itself. Replace the burner assembly. What is the big different between normal error code 13 and no SD (Sensor Damper)? Normally error code 13 is just low voltage or frequency;...

  • Page 53: Error Code 15

    SVC 810 Tankless Troubleshooting Manual Error Code 15 Explanation: Boiling Safety Device. The heat exchanger is too hot. At a minimum check the following: 1. Check for restrictions in airflow around unit and vent terminal. 2. Check for a foreign materials in exhaust venting. 3.

  • Page 54: Error Code 16

    SVC 810 Tankless Troubleshooting Manual Error Code 16 Explanation: Outlet water temperature is to hot. The outlet water temperature is above set point on the remote control. The unit cannot resolve the issue with the cold-water by-pass function. Display maintenance information line [5y] Hot Water Outlet Thermistor temperature.

  • Page 55: Error Code 24

    SVC 810 Tankless Troubleshooting Manual Error Code 24 Explanation: Malfunction of Operational Switch. At a minimum check the following: 1. Disconnect remote control and retry. 2. Verify unit is electrically grounded. Do not use a 2 prong electrical adapter on the power cord.

  • Page 56: Error Code 31

    SVC 810 Tankless Troubleshooting Manual Error Code 31 Explanation: Water Inlet Thermistor has malfunctioned. At a minimum check the following if you get Error Codes 31, 32, 33, & 34: 1. Check for scale build up on the inlet filter screen. This scale build up could also happen inside the machine.

  • Page 57: Error Code 33

    SVC 810 Tankless Troubleshooting Manual Error Code 33 Explanation: Hot Water Outlet Thermistor has malfunctioned. At a minimum check the following if you get Error Codes 31, 32, 33, & 34: 1. Check for scale build up on the inlet filter screen. This scale build up could also happen inside the machine.

  • Page 58: Error Code 35

    SVC 810 Tankless Troubleshooting Manual Error Code 35 Explanation: Improper Thermistor Connections. Check to make sure that all thermistor connections are good and in the proper locations. There are four thermistors on the tankless unit. They are the ambient air thermistor, cold water inlet, hot water outlet and heat exchanger thermistor.

  • Page 59: Error Code 52

    SVC 810 Tankless Troubleshooting Manual Flame Rod Status (Flame Rod #3 for 74 Series Only) display Does the 0y Flame display indicate Rod 1 any remaining Flame flame? Rod 2 Flame Rod 3 X=Not detecting flame O=is detecting flame The water heater seems to be normal. Try to operate again Pull out the relay connection of flame rod connectors (M), (L), (T) and then display maintenance information [0y].

  • Page 60: Error Code 61

    SVC 810 Tankless Troubleshooting Manual Error Code 61 Explanation: Combustion Fan failure. Fan motor does not work properly. At a minimum check the following: 5. Ensure fan motor will turn freely. Motor will operate with a small amount of restriction. 6.

  • Page 61: Error Code 66 (Rtg66 Only)

    SVC 810 Tankless Troubleshooting Manual When motor operates, is the Replace the Printed Circuit Board voltage to the water control Measure the voltage at connector B between the White#2 and Black#8 wires for: 8 to 16 VDC Replace the Water Control Assembly Error Code 66 (RTG66 Only) Error Code 71 Explanation: Gas Inlet Solenoid Valve (G.I.S.V) fault.

  • Page 62: Error Code 76

    SVC 810 Tankless Troubleshooting Manual Error Code 76 Explanation: Communication Fault with Remote Control. At a minimum check the following: 1. Check remote control wiring for loose or damaged connections. 2. Bypass remote control cable by connecting remote control directly to remote control terminals on PCB.

  • Page 63: Error Code 90

    SVC 810 Tankless Troubleshooting Manual 5. If the unit does not operate on initial installation or after replacement of the PCB, then the circuit board requires programming with the fuel type and altitude chip. WARNING: When replacing High Altitude Connector, turn off the electric power to water heater. Pull out the power cord to disconnect electricity.

  • Page 64: Error Code 99

    SVC 810 Tankless Troubleshooting Manual Error Code 99 Explanation: Fan Motor is not creating enough ventilation. The venting system passed pre-purge, but has failed during normal operation. At a minimum check the following: 1. Check for blockage of heat exchanger fins 2.

  • Page 65: Warning Code P1

    8 inches long. A flashlight and magnetic tip reach are also handy. Rheem recommends the use of a parts tray or bowl to hold small parts and screws. All of the hardware is essential to the proper operation of the unit upon re-assembly.

  • Page 66: Air Filter Switch

    SVC 810 Tankless Troubleshooting Manual Air Filter Switch a. Remove the single screw closest to white Molex connector. b. Remove Molex if replacing air filter switch. ; Cold Water Water Inlet Solenoid Connection; Cold Water Inlet Thermistor d. Step 1 and e.

  • Page 67: Hot Water Outlet

    SVC 810 Tankless Troubleshooting Manual Connector and Hot Water Outlet Thermistor a. Step 1 and 3 plus b. Remove electrical connection box (single screw on outside left). c. Remove one ceramic heater plug. d. Remove outlet pipe bracket and ceramic heater plug. e.

  • Page 68: Fan Assembly

    SVC 810 Tankless Troubleshooting Manual Fan Assembly a. Step 1 and b. Clip plastic tie holding Ambient Air Thermistor. c. Disconnect Fan Assembly Molex. d. Loosen wire clip holding the wire bunch in place. e. Remove three screws (one outside bottom;...

  • Page 69: Proportional Gas Flow Regulator

    SVC 810 Tankless Troubleshooting Manual Proportional Gas Flow Regulator (Gas Valve) a. Step1 and b. At the gas valve, remove the three retains clips and screws from each of the gas manifold tubes. Note the brass colored tube has a special clip; the silver colored tubes have a different clip.

  • Page 70: Burner Plate Cover

    SVC 810 Tankless Troubleshooting Manual Burner Plate Cover a. On the burner plate cover, remove the two retaining clips and crews from the manifold supply tubes. b. At the gas valve, remove the three retains clips and screws from each of the gas manifold tubes.

  • Page 71: Igniter And Igniter Probes

    SVC 810 Tankless Troubleshooting Manual Igniter and Igniter Probes a. Step 7 and b. Remove the two screws that hold the right hand ceramic igniter probe (black wire) on the burner chassis. c. Remove the two screws that hold the left hand ceramic igniter probe (black wire) on the burner chassis.

  • Page 72: Parts

    SVC 810 Tankless Troubleshooting Manual Parts Below are the most common replacement parts. For a complete list of all replacement parts, please see the most current parts catalog. Part Description Picture Water Flow Inlet Valve Cold water inlet valve that measures water temperature and detects flow in gallons per minute...
  • Page 73 SVC 810 Tankless Troubleshooting Manual Flame Rods Safety device that detects the presence of flame Igniter Spark igniter that lights the main burner Thermistor(s) A thermistor is an electronic thermostat. There are four of them: cold water inlet, hot water outlet, heat exchanger and ambient air.
  • Page 74 SVC 810 Tankless Troubleshooting Manual Remote Control Digital control panel that allows user to adjust temperature, monitor status of the machine and review certain maintenance functions Air Filter Assembly Inlet air filter (indoor models only) that keeps out lint and dust from inside the machine Fan Assembly Fan (blower motor) that...

  • Page 75: Parts Exploded View For Rtg2-42Pv And Rtg 53Pv

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG2-42PV and RTG 53PV Burner Manifold Ref # Description Gas Inlet Connector Control Board Water Control Valve Control Board Fuse (5A) Inlet Thermistor -White Power Line Fuse (3A) Water Inlet Connector 3/4 Program Chip Inlet Water Filter Gas Valve...

  • Page 76: Parts Exploded View For Rtg 53X

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 53X Burner Manifold Ref # Description Gas Inlet Connector 3/4 Control Board Water Control Valve Control Board Fuse (5A) Inlet Thermistor -White Power Line Fuse (3A) Water Inlet Connector 3/4 Program Chip Inlet Water Filter Gas Valve...

  • Page 77: Parts Exploded View For Rtg 53Dv

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 53DV Burner Manifold Ref # Description Gas Inlet Connector 3/4 Control Board Water Control Valve Control Board Fuse (5A) Inlet Thermistor -White Power Line Fuse (3A) Water Inlet Connector 3/4 Program Chip Inlet Water Filter Gas Valve...

  • Page 78: Parts Exploded View For Rtg 66Dv

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 66DV Sensor Orifice - NAT Description Ignitor Coil Control Board Ignitor Electrode Control Board Fuse (5A) Ignitor Electrode Power Line Fuse (3A) Blower Motor Heat Exchanger Thermistor - Yellow Blower Case Ambient Thermistor - Blue Water Control Valve Inlet Thermistor - White...

  • Page 79: Parts Exploded View For Rtg 74Pv And Gt 199Pv

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74PV and GT 199PV Gas Inlet Connector 3/4 Ref # Description Water Control Valve N/S** Transformer (120v to 100v) 1 Inlet Thermistor -White Generation only Water Inlet Connector 3/4 Control Board Inlet Water Filter Control Board Fuse (5A) Hot Outlet Connector...

  • Page 80: Parts Exploded View For Rtg 74Dv And Gt 199Dv

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74DV and GT 199DV Gas Inlet Connector 3/4 Ref # Description Water Control Valve N/S** Transformer (120v to 100v) 1 Inlet Thermistor -White Generation only Water Inlet Connector 3/4 Control Board Inlet Water Filter Control Board Fuse (5A) Hot Outlet Connector...

  • Page 81: Parts Exploded View For Rtg 74X And Gt 199X

    SVC 810 Tankless Troubleshooting Manual Parts Exploded View for RTG 74X and GT 199X Gas Inlet Connector 3/4 Ref # Description Water Control Valve N/S** Transformer (120v to 100v) 1 Inlet Thermistor -White Generation only Water Inlet Connector 3/4 Control Board Inlet Water Filter Control Board Fuse (5A) Hot Outlet Connector...
  • Page 82 ® Rheem Water Heating ® Ruud Water Heating 1241 Carwood Court Montgomery, AL 36117 1-800-432-8373 www.rheemtankless.com Printed in the U.S. 08/08 Form No. SVC810...

This manual is also suitable for:

Rtg53Rtg66Rtg74Svc 810

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