20 Most Recent Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm - Page 8 Questions & Answers

check the power supply or the gas line

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Open following link for useful troubleshooting information:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error code 11 is 'No ignition'
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf

Ensure you have gas to the appliance.
Ensure gas type and pressure are 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.

Error code 12 is 'Flame Failure'
Ensure you have gas to the appliance.
Ensure gas type and pressure are 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 maximimum horizontal vent length does not exceed allowable limits.

Range of causes are part failure, gas pressure loss, air in gas line, improper installation of gas line or vent, 120V power to unit is disrupted or unit not grounded, circuit problems, venting problems, remote control, wiring to PC board, board failure, carbon build-up on flame rod, short circuits on gas valve solenoids.
The fact that you have error code tends to eliminate your plumbing as culprit, the error code does not mention air supply, otherwise it looks like every possible cause is on the table.

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Open following link for handy Rheem troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

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Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Use following link for Rheem/Paloma/Richmond/Ruud tankless troubleshoot:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

http://www.palomastore.com/paloma_error_codes.html
Range of problems can vary from fan motor wiring, to remote control terminals (error 76), to bad remote, to bad circuit board.
1) Replace remote control
2) Read error 76 and 79 shown in link above
3) Contact local service technician
4) Contact Rheem

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Also take advantage of fixya expert assistance live.
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Fixya is always less expensive than a service call.

Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf

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For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code A1 21 is malfunction of Air intake filter switch
Ensure air filter door is seated.
Ensure front panel properly installed

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Use following link for Rheem tankless troubleshoot: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

I believe error code C7 is same as error code 76

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Rheem tankless do-it-yourself troubleshoot resources
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Hi,

I was able to locate a manual for your unit.

See the link below:

http://demandware.edgesuite.net/aabh_prd/on/demandware.static/Sites-Appliance-Site/Sites-CompactAppliance_Primary/default/v1300218722880/pdf/ownersmanuals/rheem/RTG74IndoorOutdoor_owners.pdf

Then see page 33. The error code you describe is not specifically listed, and the manual advises that you call their customer service number for further assistance. This is the text for customer assistance:

Manufacturer's National Service Department at the following address:

2600 Gunter Park Drive

Montgomery, Alabama 36109-1413

Phone: 1-800-432-8373.

When contacting the manufacturer, the following information will be requested:

a. Model and serial number of the water heater as shown on the rating plate attached to the front panel

of the heater.

b. Address where the water heater is located and physical location.

c. Name and address of installer and any service agency who performed service on the water heater.

d. Date of original installation and dates any service work was performed.

e. Details of the problem as you can best describe them.
f. List of people, with dates, who have been contacted regarding your problem.

You need the RHEEM training manual [email protected]

Hi there may be a number of factors involved with this appliance,
1. if you are opening a hot tap/faucet only slightly there may not be enough water flow to keep the burner alight. try turning on the tap alot at first then decrease the flow to your required amount
2. there may be a blockage or partial blockage in your gas supply.
3. water may have entered the casing and got into the electrical componenets of burner jets
And lastly if your Rheem unit is past its warranty & you can't get a service technician out to check it, then your last resort would be to get a qualified person to have a look at it

http://www.greatergoods.com/store/energy-savers/tankless-water-heaters/rheem-rtg-74-dvn-natural-gas-tankless-water-heater/prod_386.html
manual above.
I professionally recommend that you get a Plumber/Gasfitter, to check this over, as this isn't usual, and I wonder if there are not "Other" problems too... with anything that uses Gas one has a responsibility to the entire family to have it professionally checked over, in my humble view..

Error code 76 has to do with communication fault with remote
Error codes here: http://www.palomastore.com/paloma_error_codes.html

Error 21 means the air intake cover problem.

Malfunction of Air Intake Filter Switch Ensure air filter door is properly seated.
Ensure front panel is properly installed.
Error codes here: http://www.palomastore.com/paloma_error_codes.html

Richmond is Rheem
Typical manual shows regular maintenance on page 29:
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf
The word maintenance is used throughout manual.
Tankless are prone to lime build-up and should be de-limed each year, and cannot be exposed to more than 11 grains of hardness in the water.

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This should help you http://www.tankless-water-heaters.com/troubleshooting.htm

Hi,
The best way to thaw it is to use a heat gun or a hair dryer....keep the gun back enough so that you heat it slowly and keep it moving all the time so you do not get too much heat in one spot....

this will thaw it out for you...

heatman101

Rheem Tankless Water Heater Selection and Installation Videos

• Introduction - time 04:11
• Pre-Qualifying the installation - time 01:13
• Selecting the Right Product - time 01:48
• Key Differences Between Tankless & Storage Heater- time 01:27
• Choosing the Location - time 01:20
• Installation: Major Components - time 00:58
• Installation: Tools Required - time 00:48
• Installation: Mounting the Heater - time 01:15
• Installation: Plumbing & Gas Connections - time 04:29
• Installation: Side Wall Vent Termination - time 02:41
• Outdoor Installation - time 01:21
• Connecting the Remote Control - time 01:42
• Turning on the Water Heater - time 01:00
• Commercial vs. Residential Products - time 01:47
• Manifolding Multiple Units - time 01:43
• Troubleshooting & Additional Support - time 01:01