Question about Heating & Cooling

1 Answer

Hot water goes on and off

I've got a rinnai tankless hot water heater that was installed in July '06 with a wall mounted thermostat. Just recently, I've noticed that sometimes the display on the thermostat is blank as if it is turned off. At other times it is on. Then when you turn on the hot water anywhere in the house, the display will sometimes go off and come back on and stay on which will provide you with hot water. At other times, the display will flash on and off. Of course when it is off, you will not have any hot water. Sometimes it will flash on and off, then go off for about 20 seconds, and then come on and stay on. Pushing the on/off button or the priority button on the thermostat does absolutely nothing. I have checked the plug in the attic and it is okay. Any suggestions?

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

    Champion:

    An expert who has answered 200 questions.

  • Expert
  • 417 Answers

Only turns on when heating up then shuts off until it need reheating again

Posted on Jul 11, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a wall mounted tankless water heater for


It's scaled
Do you have a softener? Water must be 15 GRS/PPM or less in iron and calcium. Hot spots in unit are boiling water and are causing the noises.
Descale and flush unit following Rinnai Specs and check water hardness for compliance with Rinnai standards because too hard an inlet water will VOID the Heat Exchanger Warranty (10 year).

Oct 19, 2014 | Water Heaters

1 Answer

How do you insulate a tankless water heater for winter


If you have tankless electric, it can simply be insulated... but tankless electric are seldom mounted outdoor.
Service bulletin says: "the only way of assuring protection is to completely remove the heater during those times the area may experience freezing temperatures.

There are tankless with built-in heater for exterior installation.
Check your manual, or add a comment with specific model number and maybe I can find the information.

Here's why they install tankless outdoors: Because tankless burn more fuel per gallon of hot water. This requires larger gas line and larger vent pipe than typical tank-type gas water heater that is usually installed indoors.
They install tankless outdoors, so there is no need for expensive vent pipe, and because there is ample incoming air to support combustion.
So if tankless does not have factory-installed internal heater, then the unit can freeze easily when the combustion draws in cold air.
Of course you can put heat-tapes on the pipes but the heat exchanger inside will quickly freeze during periods when hot water is not being used, and combustion is not taking place.

You can move the tankless installation inside and use correctly-sized vent and intake pipes directly through the wall. This will generally protect tanklesss from freezing if room is heated adequately.

Sep 26, 2012 | Rinnai Webstone The isolator EXP tankless...

1 Answer

Hello, I recently had a Rinnai tankless water heater installed. The old water heater was in the garage. The new tankless heater is installed outside, and is about 25 feet away from where the old one...


I agree with you. The foam insulation should only be on the Hot Water side. The cold water side doesn't make any difference, as that temperature rarely changes in California.

Hope this helped you AK, thanks for choosing FixYa.

Aug 10, 2011 | Heating & Cooling

1 Answer

Can we install a a ptg 74pvp tankless hot water heater in a closet? Would we need to install grating in the closet wall to provide more fresh air?


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

Feb 02, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Difficult to turn the water heater


step one... remove from wall
step two... throw in dumpster
step three... purchase and install a quality tankless water heater.

Rinnai, takagi, Noritz are the only brands I install now. Aquastar (Bosch) always had problems, then purchased by Bosch but never fixed the problems, just put their name on it and sold them at Lowes or home depot.
Garbage!

Jul 31, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

OUTSIDE GAS MODEL NUMBER c85, WATER IS NOT HOT TAN...


I have two C85 Rinnai and one is turned off because it leaked... the other one does not heat water... I have it set on 120.
Where can I download a repair manual on these? I am in Nicaragua and dealer wants to replace them or something.

May 20, 2010 | Rinnai Digital Remote Water Heater Control...

2 Answers

Exterior mounted Rinnai tankless water heater not


check to see if you have a blocked line on the hot water side

Jan 08, 2010 | Rinnai Webstone The isolator EXP tankless...

1 Answer

Our Rinnai tankless water heater is producing water as hot as pre


Power outage will reset Rinnai unit to that temperature. Read manual for more info.

Nov 28, 2009 | Rinnai Water Heaters

3 Answers

Rinnai Propane tankless Water Heaters R85e-1


Piping of these heaters in tandem is critical. Specified by Rinnai in their design manual, the cold water should be piped to both water heaters with a back-flow presenter installed before the first heater. The hot out piping should be "Tee-d" together and going to your hot water needs.

If piped as per the manual, try turning the water off to only one of the units. Turn on a hot water tap and see if the unit stays on without interruption. Then try the same on the second unit. You may find that one unit has a bad flow control, which is shutting off the flow of water.

You can get more technical help y contacting Rinnai direct at 1-800-621-9419 ext. 207.

Feb 06, 2008 | Rinnai Desa Vent-Free Infrared Gas Heater:...

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

95 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2597 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Donni Steen

Level 3 Expert

659 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...