Question about Rinnai Heating & Cooling

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Hi there i have an old rinnai tankless water heater model # REU-502 and i need a new thermocouple (pilot won't stay lit after i hold it on for ever)i have the original manual but no one locally can he

Thermocouple has 2 leads coming off the probe

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  • Rinnai Master
  • 15,691 Answers

That unit has a 5 year warranty on the parts that you are talking about. The unit also is proprietary and you have to contact them for service.

Posted on Mar 31, 2014

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Posted on Jan 02, 2017

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SOURCE: Rinnai Tropic ventless heater. Pilot will light

found that the pilot tube had dust bunnys in mine so blew it out with a air can i had for the computer now the pilot light stays on just fine

Posted on Feb 09, 2010

mxc2
  • 146 Answers

SOURCE: My Master propane heater will not stay lit. It

Yes this is probably the thermocouple connection.

Just remove the end of the thermocouple from where is goes into the gas valve and leave the end that goes into the flame in place.

Clean the end of the thermocouple connect by scraping off just a little metal from the end just about there the nut tightens the thermocouple into the gas valve. After you have exposed some new metal do the same inside the valve where the thermocouple seats into the gas valve.
Use a small pic or similar item to scrape inside the gas valve to expose some new metal there also.

Now reassemble the thermocouple into the gas valve and see if the heater works.

Here is a link with some more instructions.
http://www.msservice.net/ts/reseat_thermo-clean_pilot-ODS.htm


Thanks

Posted on Oct 10, 2010

TheMobilian
  • 8220 Answers

SOURCE: I have a Rinnai Tropic ventless propane heater. I

The thing with these is over the summer months when they are not in use they get dust inside the ODS safety pilot. When that dust gets in there it cuts down on the oxygen inside and the safety simply shuts down because it was designed to do that. What you need to do is flush the pilot and allow it to dry. I use a product caller but you could use shop air or even a soda straw to blow out the pilot. I used to sell these thermocouples for ODS systems and they are not cheap. Most times they do not solve the problem either because the pilot is dusty. A brand new one won't solve your problem and a cheaper thermocouple don't work on these. More HERE


Here is the whole thing for $52 not a bad price
The thermacouple alone for these cost nearly as much by itself.

Posted on Dec 24, 2010

SOURCE: pilot light on the gas boiler won't stay lit it's

The pilot flame must touch (burn) the tip oqef the t-couple to hold the magnet in the gas value open.make sure the pilot orifice (hole) is clear.the pilot pressure (in the tube) is factory set full open & can only be adjusted down (less). Also check the gas **** didn't get closed or turned half way.? Assuming its not the t-couple. If all is good & it still won't stay on. Replace the gas value.!

Posted on Sep 21, 2011

  • 1 Answer

SOURCE: water heater pilot light will not stay lit.

Had a water heater once that after several new thermocouples found out it was the actual valve itself. fortunately the $198.00 valve was under warranty the factory rep said too often people over tighten the thermocouple into the valve crushing the magnet inside and it destroys the whole valve

Posted on Oct 25, 2011

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1 Answer

Pilot light wont stay lit once button is released unit is about 11 years old


call your plumber and have it serviced possibly just needs the thermocouple replaced .

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I have a old Rinnai gas water heater Mod REU 55 FTB, after a year not in used, now the gas can not flow, how is the solution ? Thx


If it hasn't been in use for a year or so there could be a couple problems. Sometimes the gas dissipates from the line after an extended period of inactivity. You may need to try several times to light the pilot or the line may need to be purged. Also, if there's gas to the appliance and the pilot will light but not stay on the thermocouple is bad and should be replaced.

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Hold the pilot button down for a full minute after it lights, then release. If this does not work then the thermocouple is not adjusted where the flame is heating it or you just have a faulty new thermocouple.

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Piloit won't stay lit.


I would check to make sure thermocouple is in proper position in pilot flame. If so and pilot won't stay lit I would replace thermocouple. Thanks

Nov 12, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I "think" I have pinpointed the problem but want confirmation before I buy this part. the sequence of "lighting " the pilot is working fine and the water flow is circulating as it should. when I "turn"...


To keep the Pilot running... TYPICALLY the instructions say hold the pilot down for 30 seconds to allow the thermocouple to assume control... If extending that 30 seconds a wee bit does not work and your "pilot" keeps going out...

You have indeed found your "trouble"

The obvious defferences being length (first
(see generic parts below)

Follow the instructions on the replacement &
- DO NOT overtighten...!!

https://www.bing.com/search?q=thermocouple+rinnai+REU-95GS&qs=n&form=QBLH&sp=-1&pq=thermocouple+rinnai+reu-95gs&sc=0-28&sk=&cvid=AE29392FA0A049CDA62B934C932F13A7

Generic
Amazon com replacement thermocouple

Carnac the Magnificent

Mar 11, 2017 | Rinnai Desa Vent-Free Infrared Gas Heater:...

1 Answer

Rinnai reu-56es. cant get the pilot to light.... testing unit before water lines are permanently connected all filters are clean and wiring seems ok. just exhaust fan wires are not connected . how would i...


To test the thermocouple you will need to heat the tip with a lighter and use fluke meter to test the millivoltage being produced by it. To purge the unit of air shut off the gas line valve. Disconnect the connecter on the unit. And turn on the valve just slightly for a few seconds and release a little bit of gas. Be very careful doing this!!! Make sure there are no sources of ignition nearby. A few seconds of bleeding should be enough to clear out any air in the gas line. Then re-connect and tighten connector using two wrenches(one for a backup) then turn thee valve back on and listen/smell for any gas and soap fittings to check for leaks. After the air is clear if this is a manually set pilot then push the ASO button you use to set the pilot. You may need to hold it for a minute to make sure all the air goes thru the pilot. Then light the pilot while holding the ASO button in. You may need to hold this for a minute or two. When you let go it should stay lit. Look for a strong pilot flame that is blue not yellow and is making proper impingment with the thermocouple/pilot generator head assembly. You will not be able to fully test this unit without the water on due to this unit works off of a pressure/flow switch and the burner will not come on if it does not have water flowing. If it is not electric ignition and the pilot is lit manually then you should be able to light the pilot and have it stay on.

Sep 26, 2009 | Rinnai Heating & Cooling

1 Answer

I don't know how to restart my old bosch water wizard 10p, pilot light has gone out.


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1 Answer

Rinnai wall heater won't lite.


You may need to take the pilot assembly apart and clean the pilot orifice. If the pilot does not stay lite you may need a new thermocouple. Good Luck.

Mar 29, 2008 | Heating & Cooling

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