Question about RTO Takagi T-M1 Mobius Gas Tankless Water Heater

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TAKAGI T-M1 ERROR COSE 141

HEATER NOT FIRING UP AND THROWING ERROR CODE 141

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Posted on Jan 02, 2017

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SOURCE: My Takagi T-M1 water heater

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.

Posted on Apr 07, 2011

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Code 211 comes on but vent is clear of any debris or blockage. Sometimes can go days without alarm sounding sometimes alarm sounds 3-4 times in 10 minutes.


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.

Gene
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Mar 05, 2015 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

Takagi t-k3 runs hot on low to med flow on high turns cold & flame shuts off


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

Sep 20, 2014 | RTO Takagi T-K3 Flash Gas Tankless Water...

2 Answers

How do you turn the valve manually?


the valve has a shaft with a small pin, it can be turned with a needle nose plier.

Nov 14, 2013 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

Error code 541


Error Code 541 indicates that the Two Way Valve is malfunctioning. This assembly consists of a small motor and a rotating ball valve that is operated by the motor. The replacement part is only sold as a unit (Motor and valve) for about $200. It is located in the lower left of the unit, behind the flow valve. (i.e. it is hard to reach in order to service it). You basically have to take out the exhaust fan, take out the flow valve in order to replace the 2-way valve. It's doable as a DIY, but it's not trivial.

The valve could be crusty from deposits, so before taking everything apart, it would be wise to flush the heater for 45 minutes with anti-scaling and a recirculating pump to see if anything breaks loose. (using the service valves that should be mounted on the bottom of the unit)

Mar 02, 2013 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

991 error code on a Takagi T-K3 Flash gas tankless water heater


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

Apr 22, 2012 | RTO Takagi T-K3 Flash Gas Tankless Water...

1 Answer

Takagi code 541


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

Apr 16, 2012 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

My Takagi T-K jr. keeps flashing an error code 21....the water turns cold and we shut it off ....wait a few...then turn it back on....works for a little then wil flash again...have replaced the pressure...


In my case, the error code 21 was caused by the failure of the vent fan to run-on after shut off (easily verified by listening to the unit). The problem was not resolved by swapping either the fan or the control unit with another heater. I talked to a local service tech who had a couple of suggestions. One was to move DIP switch #6 to the upper position. After doing thisit will be necessary to re-initialize the controll by cycling power off and on. This fixed the problem. I emailed Takagi tech support to ask if I should consider this as permanent fix, or if there was something else I should do. Since I got no reply, I'll pass on the tech's other suggestion: buy a Rinnai.

Mar 27, 2011 | RTO Takagi Jr. TK-JR-N Tankless Water...

1 Answer

My Takagi T-M1 water heater is not functioning. After less than a minute of operating it stops and the red light in the front is blinking.


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.

Mar 18, 2011 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

Code 991 continues to show.. will not clear... how do we clear that code???


to clear the 991 Takagi code, simultaneously press the bottom 2 grey buttons of the four just to the left of the flashing LED light. When the LED stops flashing, release and then press the reset button on the black panel about 8 inches above that

Jan 17, 2011 | RTO Takagi T-M1 Mobius Gas Tankless Water...

1 Answer

Pilot fires then quickly shuts off how do I pull a code on a Takagi T-K2?


Pilot must heat the thermocoupler a couple of minutes before letting go of the button. The coupler controls the main valve.

Jun 12, 2009 | Ultra Max Takagi Flash TH-1 Ultra High...

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