Question about Rheem RTG-53PVN Indoor Natural Gas Tankless Water Heater for 1-2 Bathroom H

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Rheem RTG 53 PVN with fault codes C4 or C7

My tankless water heater has been increasingly noisy over the past year (its almost 2 years old). Suddenly, it won't make hot water for very long. The control flashes fault codes of C4 then 76 (alternating) until I unplugged it, waited and then reconnected it and tried to use it again. Now it flashes C7 76 and won't produce any more hot water. What is the problem?

Thanks

Rich W

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  • 6 more comments 
  • Anonymous Dec 08, 2008

    Same problem after one year of use. 

  • timsnegri Jan 04, 2009

    I have the same problem with a Rheem Pronto tankless heater after one year. My plumber said nothing about a water softener voiding the warranty. My error code however, is C7 followed by a flashing 13.

  • ageedan Jan 11, 2009

    We've had our unit for almost two years. The hot water kicked off and after resetting the unit several times it still won't work and has stopped producing hot water. The code C7 comes up and alternates to 76.

    I cleaned both the air take filter and water filter but did not solve my problem.
    Help!


  • Anonymous Mar 28, 2009

    C7-76 flashing codes...disconnected remote..still same issue..NO hot water...

  • Anonymous Apr 28, 2009

    I am having the same exact problem with my Rheem.. we have had ours almost 2 years and it has been noisy and giving us the error off and on for the past year.. now it is constant.. if I can get it to reset it only heats for a max of 3 minutes then it starts the errors.. I will try the solutions below..

    Thanks!


  • Anonymous Mar 14, 2014

    when i turn the hot water, the rheem will make a very loud noise with some sort of violent vibration. sometimes it faults out with a code 13 shown on the display

  • Anonymous Mar 16, 2014

    fault codes rheem loline solar hot water unit

  • Anonymous Mar 17, 2014

    C4 56 and C7 56 keeps coming up after a short time on any help

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7 Answers

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I had the same problem with my tankless waterheater (flashing c4 76 alternately). I called Rheem
tech support and they had me 1 power down the remotepanel 2 unplug the unit from the wall 3 remove the cover 4 remove the wires for the remote panel from the circuit board and pull the twisted pair that goes to the remote out from the bottom of the unit. 5 reinstall the cover 6 plug the unit back
into the wall and turn on the hot water see if it works. It did in my case and they are sending me a new remote panel. I hope it helps.........

Posted on Jan 12, 2009

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First off, if you don't have a water softener supplying the tankless you have voided your warranty; it's in the fine print. The mineral deposits build up and clog the heat exchanger; that may not be the problem because you're not having water pressure issues. Furthermore, you don't need the control unit for the tankless to operate; remove the control unit and unplug / shut off the breaker for atleast 3 minutes. Turn the power back on and see if that resets the unit; this may get your hot water back until you can determine the error code. I will look up the Rinnai error codes tomorrow and get back to you on this since my experience with Rinnai products is limited.

Posted on Nov 28, 2008

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Here are all of the error codesfor the tankless water heaters and their solutions

Tankless Water Heater
Error Code List
Code Fault Remedy
1 of 3
00 1 Hour continuous
combustion
Close all hot water taps to reset unit.
Turn off, or remove circulation pumps (unit is not designed for continuous
operation with circulation systems).
05 Imperfect Combustion
Alarm
Clean air inlet filter.
Clean combustion air fan.
Clean heat exchanger fins.
Check for adequate combustion air ventilation openings and clean if necessary.
Check vent system for partial blockage and correct as necessary.
10 Air Supply or Exhaust
Blockage
Check all vent components for proper connections.
Check that nothing is blocking the flue inlet or exhaust.
Ensure proper venting materials were used.
Ensure condensation collar was installed correctly.
Ensure heat exchanger fins, fan, and air intake are not blocked.
11 No Ignition Ensure you have gas to the appliance.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure gas line, meter, and regulator are sized properly.
Ensure appliance is properly grounded.
Check gas solenoid valves for open or short circuits.
Ensure igniter is operational.
Check igniter wiring harness for damage.
12 Flame Failure Ensure you have gas to the appliance.
Ensure gas type and pressure is correct.
Bleed all air from gas lines.
Ensure flame rod wire is connected.
Check flame rod for carbon build-up.
Ensure gas line, meter, and regulator are sized properly.
Ensure appliance is properly grounded.
Check gas solenoid valves for open or short circuits.
Check power supply for loose connections.
Check power supply for proper voltage and voltage drops.
Disconnect remote control.
Disconnect and re-connect all wiring harnesses on unit and PC board.
Ensure proper venting material was installed.
Ensure condensation collar was installed properly.
Ensure maximum vertical vent length does not exceed allowable limits.
Ensure maximum horizontal vent length does not exceed allowable limits.

Posted on Dec 03, 2009

  • gsxrbaboy212 Dec 03, 2009

    14 Overheat Wrap Fault Ensure high fire and low fire manifold pressure are correct.

    Check gas type of unit and ensure it matches gas type being used.

    Check heat exchanger for cracks and/or separations.

    Ohm out safety circuit.

    Check for improper conversion of product.

    Check for restrictions in air flow around unit and vent terminal.

    Check for a foreign materials in combustion chamber and/or exhaust piping.

    15
    Boiling Safety Device Check for closed water heater inlet valve or restrictions in cold water inlet pipe

    (must be fully open).

    Check for clogged heat exchanger (scale buildup).

    On commercial water heater, lower setpoint temperature below 180F at high

    altitude.

    16
    Over Temperature Warning Check for clogged heat exchanger.

    Check for restrictions in air flow around unit and vent terminal.

    Check for a foreign materials in combustion chamber and/or exhaust piping.



    21
    Malfunction of Air Intake

    Filter Switch

    Make sure air filter door is properly seated.

    Make sure front panel is properly installed.

    24
    Malfunction of Operational

    Switch

    Press max button on PCB to reset.

    Press min button on PCB to reset.

    Replace PCB

    29
    Heat Exchanger Outlet

    Temp. Too Low

    Clean heat exchanger air inlet

    31
    Water Inlet Temperature

    Sensor Fault

    Check sensor wiring for damage.

    Ohm out sensor

    Check and clean scale from sensor.

    Replace sensor.

    33
    Outgoing Water

    Temperature Sensor Fault

    Check sensor wiring for damage.

    Ohm out sensor

    Check and clean scale from sensor.

    Replace sensor.

    34
    Combustion Air

    Temperature Sensor Fault

    Check sensor wiring for damage.

    Ohm out sensor

    Check and clean scale from sensor.

    Ensure fan blade is tight on motor shaft and it is in good condition.

    Check for restrictions in air flow around unit and vent terminal.

    Replace sensor.

    35
    Improper Thermistor

    Connections

    Check that all thermistors are connected to propor connections on PCB.

    51
    Gas Inlet Solenoid Valve

    Fault

    Check gas inlet solenoid valve wiring harness for loose or damage terminals.

    Ohm out solenoid valve.

    52
    Modulating Solenoid Valve

    Fault

    Check modulating gas solenoid valve wiring harness for loose or damage

    terminals.

    Ohm out solenoid valve.

    61
    Combustion Fan Failure Ensure fan motor will turn freely. (Motor will operate with a small amount of

    restriction.)

    Check wiring harness to motor for damaged and/or loose connections.

    Ohm out motor winding.

    71
    Gas Inlet Solenoid Valve

    Control Fault

    Check gas inlet solenoid valve wiring harness for loose or damage terminals.

    Ohm out solenoid valve.

    Replace PCB

    72
    Flame Sensing Device

    Fault

    Ensure flame rod is touching flame when unit fires.

    Check inside burner chamber for any foreign material blocking flame at flame

    rod.

    Check all wiring to flame rod for damage.

    Check flame rod for proper voltage.

    Remove flame rod and check for carbon build-up, clean with sand paper.

    Replace flame rod.

    76
    Communication Fault with

    Remote Control

    Check remote control wiring for loose or damaged connections.

    Bypass remote control cable by connecting remote control directly to remote

    control terminals on PCB. Replace cable if found to be faulty.

    Replace remote control.

    Replace PCB.

    79
    Fan Motor Current Fault Ensure fan motor will turn freely. (Motor will operate with a small amount of

    restriction.)

    Check fan motor for proper voltage.

    Replace fan motor.

    Replace PCB.

    Tankless Water Heater

    Error Code List

    Code Fault Remedy

    3 of 3

    80,81
    Gas Cut-off Failure Ohm out all solenoid valves.

    Check voltage of all flame rods.

    Replace gas control valve.

    82
    Gas type data failure Program PCB for proper gas type.

    99
    Blocked Flue Fault Clean any blockage in heat exchanger, combustion fan, inlet filter, and exhaust

    flue.

    No

    code

    Nothing happens when

    water is flowing through

    unit.

    Make sure unit is connected to proper power supply and circuit breakers are on.

    Make sure power supply inlet fuses are not blown.

    Clean inlet water supply filter.

    Ensure you have at least the minimum flow rate required to fire unit.

    Check for pipe dope inside water flow control turbine.

    On new installations ensure hot and cold water lines are not crossed.

    Check for bleed over. (Close cold water supply valve to water heater. Open hot

    water taps at fixtures. If water flows steady from hot water taps, there is a bleed

    over in the system.)

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I get code c7 76 if i unplug unit and plug unit back it works for few minutes and same problem 76 c7 error

Posted on Sep 12, 2010

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More important than the c4 is the error code of 76. It is that the remote is not talking to the heater. I directly connected my remote to the heater and the problem went away.

Posted on Feb 20, 2009

  • mariaperez Mar 08, 2011

    How did you accomplish that. I can't find anything on how to do that.

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Error code c4 76 how do we fix this

Posted on Jul 24, 2010

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I have a C3 82 code. Any ideas??? Brand new just installed an hour ago!!!!!!!!!!!! This is the 2nd one. I will never reccomend this to anyone. THESE ****!!!!!!!!!!!!!!!!!

Posted on Aug 21, 2009

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You have an old tankless computer and it won't work?
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Copy following links for possible resources including required yearly maintenance so tankless computers can last 4-6 years before needing replacement:
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Do you have 3-phase water heater? Is this balanced or unbalanced 3-phase unit. Add comment and describe product in detail, including brand since i have some service resources for both types.
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2a28cd2.jpg
See image larger

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