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Generally tankless must be maintained on yearly basis.
Error codes are usually stored in the computer memory until they reach a threshold and then the error code is displayed... it is possible the control board is bad.. or the sensor that feeds information to the control board is bad.
Contact manufacturer or installer.
Contact local service technician who is qualified on that specific brand.
OMG 95 PSI is too high a pressure for a tankless! What was the W.C. in inches on the manometer?
Also on a T-K3 12 isn't a Code but a partial Code. You need an R/C to make this easier as counting led flashes produces wrong codes.
you'll have to find the correct code it's throwing not a partial.
And put a Pressure Reducer on this to below 60 PSI. 95 PSI is only impressive when it blows the tubing out after a few years.
Call Takagi in California not A.O. Smith in TN and they'll help someone fix this
Flowmeter.....Gas Pressure.....Ignition?
I'm not psychic.
Tk-Jr is a dependable 140-145,000 BTU 2nd Gen Unit SS Vent , <.82 EF.
Failure is a Tech Service issue and the Tech may need Factory Support from California. This is probably a pre-A.O. Smith/Takagi unit
Does the igniter spark 3 times than shut down and fan purge HE? Can you smell gas tracer (remember NG/LP is odorless w/o mercapthan in it)? Tech will need a digital Manometer for Line and Manifold Pressure Test. And a Multi-Meter Toll Free # on Unit or in Manual
I doubt this Takagi computer unit was maintained as shown in product manual, and that heat exchanger was not delimed each year as shown in product manual. So the heat exchanger is probably heavily coated with un-removeable scale... since yearly deliming will not fully remove scale on tankless units, the tankless computer is designed to sprial downward in efficiency despite glossy brochures that promise endless and effortless hot water for 20 years ... as if any computer will last 20 years: http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime
I always recommend replacing tankless computer with tank-type water heater for $385 for same-day do-it-yourself solution and to save the endless expenses that arise with computer-driven water heaters. http://waterheatertimer.org/How-to-install-gas-water-heater.html
Re- set code!!!! We have a Takagi TH3 DV 540 model.Air intake got blocked with snow, condensation etc.Once we cleared that then you just have to re-set it to clear the 991. On our model there are 4 tiny buttons across the bottom (Take off front cover) to find them. of the computer board assembly bottom left corner. Push the two buttons on the right simultaneously hold for 15-20 seconds or so, then turn the Takagi off then on again- should work now! If you have a different model then those buttons will be in the bottom left corner still but running vertically- try doing as above with the bottom two buttons. We had to go without heat and hot water for 2 days until we could get hold of someone to tell us this. We called Seneca Supply 716-852-4744. Good luck
Code 541 means the 2 way valve is not turning, that could be the valve has build up calcium due to hard water and the attached motor is not able to turn it, or the motor is broke or finally the controller (Compute Board is defective). The 2 wau valve sits behind another valve when looking at the unit on the left hand corner, it must be taken out first to gain access to the 2 way valve. The 2 way valve motor can be seperated from the valve by two screws and the valve can be manually opened but turning it to the horizantal position, there is a pin on that shaft. Turn kon the heater then but leave the motor connected, if the motor turns for short time then the PCB is most likely ok. This usually indicated that there is too much of build up inside the valve. If the tankless was properly with bypass valves (outside of the unit) installed then this can be easily fixed. Turn the unit off and run with an external pump and bucket with vinegar for about 30 minutes by using the bypass valves. This will clean the 2 way valve from inside and should turn then easily and the motor will be able to control it. This is usually beyond the DIY scope, call a real pro for that. http://www.justtankless.com
I HAD THE SAME PROBLEM. I CONTACTED TAKAGI WHO SENT OUT THE REPLACEMENT PART. AFTER INSTALLING THAT PART, IT WORKED FOR A MINUTE AND STOPPED. I CONTACTED TAKAGI ONCE AGAIN AND WAS TOLD "OH, THAT MOTHERBOARD GOES OUT SOMETIMES IF THAT FIRST PART GOES BAD!" THEY THEN SENT OUT A NEW MOTHERBOARD WHICH FIXED THE PROBLEM.
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