Question about Ultra Max Takagi Flash TH-1 Ultra High Efficiency Gas Tankless Water Heater
I have a takagi TK-JR that I use to heat a closed loop hydronic system in my garage. I use a grundfos three speed pump and run it on medium speed. It has worked great for two years and all of a sudden this year when I fired it up it vibrates like crazy. I cleaned the filter, added more air bleeds, flushed out the system and refilled with new 50% glycol and the thing still vibrates. I had the gas supply pressure checked, 8" of water and the takagi tech walked the gas guy through the process of dropping the manifold pressure but the next day when I fired it up, it vibrated again. If I stand there and nurse it through the first 15 minutes of operation by dropping the pump speed to low, I can get it to work without noise for as long as it is firing. Heater will not fire up with pump on low speed as there is not enough flow so I have to start it on medium speed and then switch to low speed so it does not vibrate itself to peices. I also had to up the pressure in the system to 30psi from 15psi and that seemed to help a bit. It acts like the water is boiling and that is causing it to vibrate.
I have the same problem with a T-K3. The Takagi support site recommended cleaning the burner. When the plummer arrived to attempt the cleaning, he was not convinced that it would help. He called the Takagi 800 number and let them hear the problem over the phone. They had him set the fan speed dip switch (#4 on the upper left bank of switches) to the up ("on") position and reset the system. Problem resolved! Why they didn't recommend this when I contacted them, I haven't got a clue. Anyway, the system hasn't vibrated in several days of use.
Posted on Dec 08, 2009
Szstark's solution is correct. I had the same problem and when I switched the dip switch to #4 it worked (at least so far). If that does not work for you and you still have noise and vibration then you might need to "direct intake vent" the tankless system. The noise you hear, as it was explained to me, is the fan trying to handle the gas load coming into the unit, which means your're not getting enough air into the unit. Direct intake venting (review the page in your manual) is an additional vent that you can put to the left of the normal vent system. You then feed that additional vent to the outside.This will allow more air into the unit. You especially might need to do this if you live in higher elevations. I'm not a Takagi Tech but I have called them soooo many times about this problem and read the manual twice I feel I could start installing the units. My husband is impressed. Hope this helps....Christine
Posted on Jan 14, 2010
Szstark's solution worked for us! Thanks SO MUCH--we've been living with this noise for months. The tech at Takagi explained to me that the vibrating noise is probably due to the "manifold pressure being out of whack." There are two possible solutions to this--the easy, diy, solution is to turn off the power, set the #4 dipswitch to 'on' as szstark describes, and then turn the power off again (no need to reset the system). This ups the speed of the fan 6% and changes the air/gas mixture, and, in some cases, will fix the problem (for us it did). If this doesn't work, then you need a plumber with a digital manometer to come in and adjust the manifold gas pressure. Takagi will email instructions for the plumber if you call their direct tech support line 866-882-5244.
Posted on Dec 10, 2009
I have a Takagi TK-3 with a loud vibration.Dip switch #4 , of the upper bank to the up position . all done no more noise. Thank you Szstark for the help
Posted on Jan 25, 2010
I have two Takagi T-KJr. instant water heaters; one for a hydronic floor heating system and one for culinary hot water. I am running my hydronic system at approx. 100psi and have never had a problem with vibrations on it. The culinary heater on the other hand has given us a lot of trouble with vibrations and when running hot water into the bathtub it has even turned off at times (on full blast). This is the only pipe in the house that is 3/4" all the way from the heater to the faucet. I increased the pressure on the culinary system via the pressure reducing valve (factury set to 50psi) where the water line enters the house and the vibrating stopped. Before doing that it is advised to check that other devices you might have on your system (hot or cold), e.g. water softener, water purifier, ice maker etc., can handle the increased pressure.
Posted on May 30, 2009
These heaters are only rated to 30% glycol to prevent "Low Temperature Boiling". The noise that sounds "like boiling" may be exactly that if you are running 50% glycol (as you say you are).
Posted on Nov 16, 2009
I have a TK2-jr which I dearly love but it too had a bad habit of vibrating whenever the internal squirrel cage fan became even slightly fouled. Increasing the fan speed with the dip switch helped, but like someone else said, it's only a temporary patch. My unit is located in the worst place possible for something that requires clean air, in the kitchen behind the clothes dryer. A fresh air intake was not feasible in this location. I was having to clean the fan every two weeks and was on the verge of going back to a tank type heater. The problem was that the unit just could not get enough clean air. Out of desperation I decided to try blocking the front air intake and installed a small 120mm axial fan with a filter over the fresh air intake hole on top. That took care of the problem but the axial fan ran all the time. To stop that, I got a small current actuated switch that senses current down to about 3 amps and passed the hot wire to the unit through the sensing switch in such a way that it would sense the current inflow when the unit started and start the axial fan automatically. When the heater shuts down, the axial fan now goes off. All I have to do is clean the filter on the axial fan now and then and I have no vibration problem. This is admittedly a fairly involved solution, but as I said, I love this heater and was willing to go the extra mile to make it work. The parts I used are available on Ebay and cost less than $50.
Posted on Apr 27, 2016
Our tankless TK3 installed for 5 years.
Source of vibrating for Takagi tankless water heaters has been identified for my application. It is caused by a dirty blower fan. Once the water heater blower fan hits the resonant frequency of the heater enclosure, it will vibrate badly. Adjusting the fan speed dip switch is merely a band-aid for the problem - as it changes the fan run speed and thus avoids the resonant frequency - so no vibration. But I can assure you that the vibration will return eventually unless you clean the fan.
Step one, remove the cover, undo all the quick connect electrical items. remove the blower fan. use a 4-1 paint tool to pry up the metal clips on the fan housing use a socket wrench to remove the impeller. It goes at high rpm, so any amount of grime or dust could cause major vibration. I cleaned with garden hose, spray cleaner, then finish up with q-tips for the nooks and crannies. Clean the dust on the bottom of the tankless too.
Remove the front internal plates as well and clean the burner channels with pampers wet wipes and a chopstick. Use pampers as other brands can rip easier.
I scuffed up the probes with a brillo pad as well as they were corroded.
Take pictures as you disassemble the unit so you remember how it goes back together.
Once you put everything back and fire up the unit it will run as good as new. quiet as a mouse.
Clean the intake filter on the cover more often to avoid dust buildup. We have external intake on our unit as thought that might have been the issue, so we will be adding a 4" foam filter outside to filter the air to avoid a dirty blower in the future.
This cleaning process takes a while, but it is not terrible or complicated - just don't lose any parts.
Posted on Aug 11, 2015
TK-3 Dip Switch #4 seems to be working for me too.
I can't believe I have been putting up with this for years - ie, slowly
turning on the system seemed to work.
Opening the closet door seemed to help, hopefully
the 6% from dipswitch #4 will do the trick.
Posted on Jun 23, 2013
The #4 dip switch resolved the problem for me.... !!!!!!! Been driving me crazy for a week or so.
Posted on Feb 17, 2012
Awesome! Thank you thank you! Flipping tiny switch #4 solved my problem!
Posted on Jan 27, 2012
Hammering. put a expansion tank before the water heater on the cold side and this should fix the problem
Posted on Oct 06, 2010
SOURCE: takagi TK-JR vibrating noise
Remove your hydronic pump and replace the flexible impeller coupling that couples the impeller blades to the pump motor. make sure you don't do this on a sat or, sunday (i hate house calls then) and, be sure you have a new pump housing gasket before you start the job. Also check the unit for loose pipe brackets
Posted on May 20, 2009
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