I recently had a similar problem with my N-132M-ASME heater. The unit would come on, then shut down and flash Error Code 21. According to the owners manual, that code indicates the unit is not getting enough air. I tried vacuuming the unit, blowing it our with air and checking to be sure the exhaust lines were clear. Nothing helped. A service technician came out and recommended I descale the unit and clean the burner. I did this but the problem did not go away. He also suggested I replace the Burner Sensor. It's not an expensive part, around $20. I ordered the part and have not had a problem since I installed it. Hope this helps.
SOURCE: My Noritz 6.9 flashes a 90 code. I was told by
I recently started getting an error 90 on my N69-M unit. I finally got a hold of someone at Noritz tech support and they state this error is a general combustion/exhaust/air flow error. Here is what they suggested to look at.
Gas Pressure – The unit has a minimum flow rate for the incoming gas and if the system is gas starved, then you have some sort of obstruction or restriction. If this is a new install and you are getting an error 90, this is likely your problem but if this is an existing install that suddenly started getting this error, unless someone was monkeying around with any values you might have in-line, this probably isn’t your problem.
Air Flow – This is a ventilation issues caused by the build-up of dust, lint, etc that chokes the flow of cool air to the unit and causes the burner to overheat. If your unit runs for a while and then pops an error 90, this is probably your problem. They told me they get a lot of these errors when the unit is installed in close proximity to a clothes dryer, which makes sense. To resolve this, remove the front panel and blow out the intake holes and slots (I tried to shop-vac mine before blowing them out and I was amazed at how much the vacuum didn’t remove). After removing the cover, the first thing you should see is a system board that is covered by a black dust shield. The board is held to the unit by 3 screws (one on the top left and two at the bottom). Remove the screws and let the board dangle by the wires plugged in it. You should now be staring at the fan assembly. They suggested that I either remove the whole unit and clean it out or use compressed air to blow it out. I went with the compressed air route because getting the fan assembly out requires removing and eventually reinstalling 2 relatively small screws way in the back of the unit that you have no real easy way to get to. Blow/clean the fan out and then blow out everything else inside the unit. Reassemble and you are good to go, provided this is your problem.
Exhaust – You might see an error 90 if the exhaust can’t freely flow. Two things can cause an exhaust issue to throw this error. One is that the flapper valve on the outlet of the system sometimes gets stuck closed. This should be easy enough to fix. The other is an obstruction in your exhaust ducting or using too small of a diameter duct to exhaust the unit.
Hope this was somewhat helpful and prevents you from having to wait on hold forever for Noritz support or having to pay someone to fix your problem.
SOURCE: My Noritz 6.9 flashes a 90 code. I was told by
I have a N-084M also shows error code 90. The heater had been used for 3 month then stored for 2 years. The gas is 3/4, about 30ft from the meter. When I mount a loaner, a Rheem 7.4 gpm, it works fine. Tried a Rinnai, it works too. But this Noritz keeps shutting down 5 minutes after the burner starts and displays error 90. I can reset the msg by push on/off on the remote, it will work for another 5 minutes before shut down again. If gas is the problem, I would think the error code should show up winthin 10 seconds. I had the front cover removed, vent disconnected. So air is not an issue here. The problem appears even when the water flow is low (which translate to low on gas useage). I measured the gas pressure at the heater, it's about 10"WC.
But, after move the heater out, mounted on top of the gas meter, it works fine. This has been bothering me for a week. Why this unit demands more gas for the same amount of heat?
most concentric vent kits do not have a cap on the exhaust termination. if they do they are usually approved for use with that particular vent kit. most of the concentric vents i have seen have terminated through the side wall of the house and have no "rain cap" on them. if the cap you put on the vent is one you "home made" then you need to remove it and get one that is approved for use on your make of vent. I suspect that the water you are getting running down the air intake part of the vent may be water that has condensed from the exhaust fumes. If the cap is an approved one then you may have a leak in the exhaust pipe section of the vent and I would suggest you call an expert in to verify the integrity of the venting system
I have the exact same problem with error code 13 on my Rheem/Ecosense 180dvn . The unit ran good for at least a year, and then I started getting the same error 13 every few minutes. I called the Rheem service department, and they told me to check the vent installation as well as the gas pressure. I reinstalled the vent with new seals. I only have about 6 ft of vent, so there should be very little resistance. I checked the gas pressure, and it shows 9 in H20 pressure, which is well in the range recommended. The service center scoffed at the suggestion that it could be their circuit board. I am totally at a losss and at the verge of ripping this very expensive installation out of my attic.
263 views
Usually answered in minutes!
×