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


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Hi...I have a Whirlpool water heater and the water only stays hot for a few minutes. How do I adjust the temperature or settings so that I can have hot water all the way through the shower instead of...


I am guessing this is an ele water heater and the temp setting are not the problem.
Problem: Not enough hot water or water temperature too low. When the top of the tank is hot the upper thermostat removes power from the upper heating element and transfers the power to the lower thermostat and heating element. If the lower thermostat is defective, then the lower portion of the tank will not be heated and the supply will be greatly reduced.
Check for power at the upper thermostat terminals where the power is sent to the lower thermostat and heating element. If there is no power then the upper thermostat should be replaced. If there is power then check for power at the lower heating element. If there is no power at the lower heating element then replace the lower thermostat.
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The dip tub is located under the fitting where the hot water comes out.

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We are having a problem with our rheem hot water system not haveing enough hot water. We called the eletricity supplier, who attended and said there relay was out of action. They said they would wire the...


If the relay is bad no source of power is going to make it work,you could try taking off blue covers.Kill power first!. there is a red reset button underneath push and turn power back on see if that works.Plus the breaker in the power panel might of popped,you'll see when you go to shut off power.If not thermostat is bad or heating elements,probubly stat,depending on age of heater,would be better to replace,most heaters have at least a 6 yr warranty,but that doesn't cover labor.Nothing wrong with system Hope that helps

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1 Answer

Running out of hot water I replace both heater coils and still seems like were running out of hot water the top coil has 230 volts going to it but the lower has no volts going to it jeff thanks


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Only one of the hot water heater elements will have power going to them at a time...
When the water at the top of the tank gets hot then the top thermostat should switch the power to the bottom one... this may not be happening...therefore you are only getting about a thrid of a tank of hot water...

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1 Answer

If there is an electricity failure how can we have a hot shower


Easy answer is you cant on these units. These tankless units store no hot water and need a 240V power supply to operate.

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In some areas in far north Queensland I came up with a back up power unit (I used to work for Rinnai who make similar units). These were for remote units that used battery lighting and just wanted a bit of hot water for remote workers.

Basically you need a spare car batttery and an electrical inverter or a back up petrol generator. These hot water units only use a very small amount of electrical power even when that are operating. I had a guy run the hot water for nearly two weeks on a car battery and inverter after cycone Larry hit Innisfail in North Queensland.

Depends how often you get power losses as to how much money you want to spend to cover yourself (99.9999% don't bother with no real hassles).

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1-First check for power to water heater and remove acces panels on heater to check power at thermostats. Thermostats have a reset button on them that trip and can be pressed to reset.

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If an element is gone at top you will get scalding hot water then go to cold.

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sounds like the element is burned out....probably got turned on before it was completely full of water. You can get a kit that has new elements and upper and lower thermostat in it. Those are the only things that can go wrong with an electric water heater....other then leaks.

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