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Code 991 abnormal burning can i get parts - Takagi Tankless Water Heater - Computer Board - EKK1L

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Abnormal two-way valve


The PC board says it needs to be swaped out

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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

I'm working on a n-0931m noritz and i have a 61 code flash and water leak out the blower housing i assume the heat exchanger is bad. is a heat exchanger difficult to replace


61 code is a fan motor abnormality. It typically indicates the fan is damaged and needs to be replaced. It can be caused by water leaking onto it from the heat exchanger.

The heat exchanger isn't difficult to replace, but it is confusing if it's your first time doing it. I'd recommend calling Noritz for assitance.

Mar 12, 2011 | Noritz Residential Heaters Tankless Water...

1 Answer

Turn on power,15-20 seconds later,get error code 991, abnormal or imperfect combustion. natural gas at 7 on the water column, filter clean. other contributing factors for this code? can hi-limit switch...


Hi,
First things... you have checked the inler filter andthe gas pressure, but have you checked and cleaned the thermistor(s)??? Also the flame sensor... clean that with a soft cloth...
Next turn down the temp with th dip switches that should tell you if it is the high limit...
Has the unit been cleaned with vinegar or CLR lately or ever??? there maybe buildup internally in the unit...
Is the flame a nice blue color or is it yellow???
Does it go out just before the unit cuts out???
Do the flames lift from the burner???

These are all things that I would be checking if I was coming to your home to check this unit...

Comment back with any other questions or comments...

heatman101

Mar 05, 2011 | RTO Takagi T-K3 Flash 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

My Noritz tankless will sometimes flash 5 red quick lights which indicates to me that it's not firing and I've only succeeded in restarting it at the circuit box. What servicing needs to happen to prevent...


You are getting an error code. A 5 flash error code is typically caused by voltage supply abnormalities. If you are using a generator, battery backup, or solar electricity inverter, make sure it is supplying your heater with a smooth sine wave AC voltage.

This code can also be caused by connecting jumpers inside the unit with power connected or buildup of soot on the sensors

Feb 24, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Sometimes the hot water just goes cold


Here are a couple things to look for:

1) flashing burner light - a flashing burner light indicates the unit is getting an error code
common error codes:
A. continuous flashing - ignition failure or abnormal combustion; look for visible water in the machine indicating a leak, check gas pressure, debris or buildup on flame rod/igniter plug, or clean unit with compressed air
B. 3 flashes - error 16, abnormal outlet water temperature; typically this code indicates you'll need to descale you unit
C. 4 or 5 flashes - exotic error codes; you should contact Noritz technical support to deal with these codes

2. If there is no flashing code, try increasing the hot water flow. In the summer time you typically use less hot water; this can result in intermittent operation of your tankless heater. Increase water flow by either: A. cleaning your showerhead and removing scale deposits B. widening your flow restrictor C. Remove your flow restrictor in the showerhead

3.If none of these resolves your problem, you probably have debris in your flow sensor. Contact Noritz technical support for a walkthrough on removing debris from a flow sensor.

Feb 18, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Fan cycles on every few minutes.There is no demand and the burner doesn't come on but the exhaust fan cycles on for a few seconds every couple of minutes.


You're most likely getting a pressure wave (spike) that is generating momentary flow across the flow sensor. The heater is registering this "instant" flow and beginning its firing sequence. Once the flow dissipates, the unit then goes into a purge cycle. I'd recommend having your water pressure tested to make sure it isn't abnormally high (above 60 psi) or abnormally low (below 30 psi). Assuming the pressure is normal, you can use a pressure reducing valve or pressure regulator to absorb the spikes and stop the unit from cycling.

Aug 12, 2009 | Noritz Water Heaters

2 Answers

What is error code 59 on a noritz tankless water heater lp?


The 59 code is typically caused by insufficient gas supply to the unit. It can also be caused by obstructed exhaust flow, stuck exhaust damper (located directly on top of the unit's exhaust), insufficient makeup air, or improperly installed venting (i.e. too long or too many elbows).

I would recommend initially checking the incoming gas pressure at the gas connection on the unit. The gas pressure should not drop below 5" water column for a natural gas unit, 8" for a propane system (the unit need to be operating at its maximum output).

Apr 29, 2009 | Noritz 7.1 Gpm Propane Lp Gas Tankless Hot...

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