Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us

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No power to keypad

No hot water keypad out

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  • Anonymous Mar 14, 2009

    no power to the keypad

  • Ly Nguyen
    Ly Nguyen Oct 27, 2017

    Put in new key pad still no power to the key pad

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I had a similar problem, the water flow control device was bad.
If you disconnect Connector B2 and the unit will start, then that will confirm the problem. Rinnai has a new improved part for replacement.

Posted on Jan 18, 2009

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Posted on Jan 02, 2017

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No hot water , no heater


No Hot Water - Electric Water Heater Troubleshooting

www.whirlpoolwaterheaters.com/owner-center/.../no-hot-water/
Whirlpool's video explaining potential reasons your water heater is not working ... Troubleshooting and Repair · No Hot Water (Video) · Replacing a Heating ...

Electric Water Heater Repair and Troubleshooting ' Whirlpool

www.whirlpoolwaterheaters.com/owner.../troubleshooting-repair/
Troubleshooting and Repair of a Standard Electric Water Heater. No Hot Water ... Not getting power is a common reason new water heaters don't work.

Troubleshooting Electric Water Heaters in MINUTES ~ Step ...

? 7:01
https://www.youtube.com/watch?v=SlyStHM9Nr0
Oct 4, 2013 - Uploaded by electronicsNmore
My tenant has a electric 30 gallon water tank. cimarron by Reheem. model ... So if u notice your water is overly hot and then notice no hot water ...

Dec 26, 2015 | Water Water Heaters

1 Answer

Hot water heater has hot in tank but dose not come out of hot water line on tank


most electric hot water systems use a heat transfer process where the element is in one tank and the house water is in another
the house water is what is being drawn off when you turn on a tap
there is a regulator valve at the top of the tank with a small lever that you open up to let water in and air out of the system
another point is that there may be a hot/cold mixer on the hot water outlet which limits the temperature of hot water to prevent scalding injuries in the bath and shower or sink
If you have one fitted they are known to malfunction and cut the hot water temperature down as, they mix too much cold water into the hot water pipe.
have a plumber check it out

Jun 13, 2015 | Water Water Heaters

1 Answer

I have a new Bradford white 40 gallon gas hot water heater. There are no single handle faucets. The hot water fluctuates between hot and cold. When I close both inlet and outlet shut off for the hot water...


Sounds like water leak.
For example, broken pipe... or water running out of TP valve.
That would explain variable hot-and-cold water at tap.
Turn off all taps, and observe if water meter is registering water usage.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Jun 15, 2014 | Water Heaters

1 Answer

How does rhe hot and cold water hook up on a 71-40d which is which top and bottom


Tanks are marked with Hot and Cold.
1) If water connections are on top of tank, look for red marking or word HOT that shows where hot water pipe connects. Look for blue marking or word COLD that shows cold water connection.
2) If water connections are on side of tank, cold water connects to bottom one, and hot connects to top.

3) If hot and cold are reversed, the tank will not work.
Pipes on top of tank: cold water enters tank and is sent to bottom of tank in a long tube called the dip tube. This means the cold is on the bottom since hot water rises to the top. The hot water exits top of tank.
Pipes on side of tank: You want cold water to enter bottom, so hot water naturally rises to the top outlet.

Nov 14, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I have a natural gas eco Sense tankless hot water heater.I will turn it on and it will work fine. then I shut it off and if I turn it back on I will get an error code c2 will blink then 11. I will then...


try cleaning your spark rod inside the unit and the other rod next to the spark rod on the side of the unit. Takagi use a emery cloth, rheem brass brush, noritz a emery cloth. but make sure that both of the rods that are in the flame chamber are very clean. It miss reading because of build up on the rods.

Oct 05, 2010 | Rheem EcoSense by 4.2 GPM Tankless Water...

1 Answer

Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm: Unit isn't turning on when I turn on the hot water...


Has it ever run? Is cold water going to cold water inlet? Hot out to hot water piping? Power ON? Control pad on? gas pressure correct?

May 16, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Hot water comes out cold side for few seconds and gets cold, no hot from hot side, only cold


Make sure that the water pipes for the cold water coming in and the hot water going out are connected to the correct positions on the water heater. If the connections get reversed, the water that is supposed to be hot will be drawn from the bottom of the tank and will not be as hot as it should be. The cold water input goes to the bottom of the tank. The hot water out comes from the top of the tank.

Oct 09, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

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