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My gas heater keeps turning off hot water during use. you

Customer Question
my gas heater keeps turning...
my gas heater keeps turning off hot water during use. you have to turn off and back on to get to start working.
Submitted: 1 year ago.Category: Plumbing
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Answered in 1 minute by:
7/8/2016
Plumber: WCohn, Journeyman Plumber replied 1 year ago
WCohn
WCohn, Journeyman Plumber
Category: Plumbing
Satisfied Customers: 1,353
Experience: Journeyman Plumber/Estimator
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Hello my name is ***** ***** I look forward to helping you! Can you get me a model and serial number?

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Customer reply replied 1 year ago

R75LS serial 08. 05-136958 may 2008

Customer reply replied 1 year ago

mr. wade , you did get my answer? jerry

Plumber: WCohn, Journeyman Plumber replied 1 year ago

I do not see it in my side.

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Customer reply replied 1 year ago

model r75ls serial 08. 05-136958 may 2008

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Got it. Rinnai tankless

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Plumber: WCohn, Journeyman Plumber replied 1 year ago

Are you getting an error code on the display?

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Customer reply replied 1 year ago

I have never mointered the display when IN USE. MY display just indicates temp and up and down arrows. no one ever gave me any info on this heater. I did just this am download troubleshooting manual from rinnai and I may be getting cold water water sandwich due to pressure changes as I live on a hill and had to install a pump and storage tank between my house and the county water supply as the county pressure would not supply all way to house. holding tank will drop pressure causing pump to come on to rebill pressure in tank which is under the house.. your opinion?

Plumber: WCohn, Journeyman Plumber replied 1 year ago

So you haven't actually witnessed it turning off, but you have felt the water go cold?

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Customer reply replied 1 year ago

what happens. I will be showering and no problem for a few min then water starts to run cold. I will turn water completely off for about a min and restart and the hot water will come back on. sometimes I have had to do this several times while in shower. more info, just turned on both cold and hot faucets in both baths and went under house to ck heater and it came on for a couple min and then just shut off as if I had turned off the hot water. no error number came up o display

Plumber: WCohn, Journeyman Plumber replied 1 year ago

We need an error code run the hot water like you were showering. The same temp as you normally use and let it run. Don't shut it off until it shows an error code. Some issues require multiple failures before it codes. I'll bet you are getting a 10 or 12

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Customer reply replied 1 year ago

I will go turn on shower and go under house and watch heater and get back with in several min. do not go away, tks

Plumber: WCohn, Journeyman Plumber replied 1 year ago

I am a factory trained and certified Rinnai tech. I'm out in the field today so be patient and we will get this figured out

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Customer reply replied 1 year ago

heater came on and stayed on about three min then turned off after about a min came back on. was still on when I left but I did notice when it was going off and made a noise like a elec fan speeding up and slowing down but this may be normal . at no time did get an error message number

Customer reply replied 1 year ago

heater turned off that one time and shower has been running for 15 or 20 min and no problem. after reading in manual about cold water sandwich due to water pressure I feel this may have been my problem all along when connected to not having any error messages, possible when my water pump kicks in it keeps enough pressure on heater and does not let water pressure go up and down. your thoughts.

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Okay I'm here to help. Can you send a picture of the control panel?

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Plumber: WCohn, Journeyman Plumber replied 1 year ago

Do you still need help?

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Customer reply replied 1 year ago

can't send picture but maybe I can describe. top roe, left side- temp gage. right s. - small lite label -In use ... 2ed row LS-up arrow. RS- box labeled (priority). 3rd row- LS- down arrow. RS- on/off switch. at bottom of box (mc81-1us-s)... what did you think about my theory?

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Press and hold UP button and PPOWER button until it display changes. It'll give 01 then an error code 02 and another code. Might go all the way to 09. Write them all down until you get two -- dashes.

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Customer reply replied 1 year ago

I just went under house and pressed the up button and (on/off) same time. unit turned off . did not display any error codes , had to press button to get the unit back on. what is this priority button? I press it and nothing happens.

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Can you send me a picture of the vent termination.

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Customer reply replied 1 year ago

as explained unable to send picture but vent direct to outside and I checked yesterday when I was running shower the outlet and it was blowing out the vent, no blockage. the heater sets next to the outside wall and vents direct to the outside.

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Well, the problem we have is you are unable to retrieve stored error codes. All Rinnai controllers should be able to retrieve the codes. Can you try turning it off the when you turn it on hold down the on button for three seconds then press the up button.

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Customer reply replied 1 year ago

I will try and get back with you. may be tomorrow as I have some other things I have to do. tks

Plumber: WCohn, Journeyman Plumber replied 1 year ago

Okay

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Customer reply replied 1 year ago

I did what you advised and the screen went from one to nine and then displayed the two dashes... no one code came up and stayed up. I tried this several times with the same results.

Plumber: WCohn, Journeyman Plumber replied 1 year ago
Ok it should do a 1 --, 2--, 3--, that would mean no codes ever recorded. If you ha had codes it'll be 1 12, 2 10, 3 10, 4 --, that would indicate you have had 3 codes with the most recent being 10.
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