We just had the mother board replaced, and have found we can't get warm water in the shower. We get hot, we get cold, but we can't get it to mix. When we try to cool the hot by turning the knob to cooler, it just shuts off the hot. I will call the plumber on Monday, but was wondering if it is something that just didn't get set right when he replaced the motherboard. Its a propane, direct-vent.
Might be bad single-handle faucet cartridge:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: warm water only
You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.
SOURCE: rheem tankless water heater error code C4 13??
check diaphrapm valve or micro/switch best of luck
SOURCE: Hi, I have a Rheem RTG-74PVN-2 tankless hot water
there will need to be a recall, everyone is having the same problems across the country. Rheem is finally taking notice. Call your dealer and they may replace unit.
SOURCE: Rheem Power Vent 2 water heater is flashing 4
The flashing light is a trouble sequence light. Find your manual to see what 4 flashes means. It's usually attached to the side of the water heater tank. Try a quick fix by unplugging the power vent and see what happens.
SOURCE: I have a rheem hot water tank when you turn on the
Could be your thermostat but it might be your inlet dip tube. Your water heater has a plastic pipe that carries the cold water to the bottom of the tank. When you open your tap, it takes the hot water from the top of the tank, the cold goes to the bottem and gets heated. If this tube breaks, or comes loose, it will short circuit the cycle. The tank is hot but as soon as you start using water, cold water comes in at the top and mixes with your hot water, giving you just warm water. If you have room above your tank, you can remove the union on the cold side , screw out the pipe nipple, and look inside and see if there is a tube. If not you can buy one from home depot or lowes for just a few dollars. Also a water heater should be partially drained annually to remove any solids from the bottom, which will allow better heat transfer.If you find bits of plastic when you do, then you know where your dip tube went. Also if you've had a hot water faucet stop up and it looked like plastic there it is.
256 views
Usually answered in minutes!
Thanks for the comments. I am embarrassed to say it was low flow caused by a clogged shower head. When we would turn the handle to cool, the flow of hot was too low to maintain and it would shut off. I feel stupid for posting, but brilliant for figuring it out!
×