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6yo NTI TFT 154 Gas/Hot Water Boiler throwing error codes (Chicago area)

FIshermanPete
FIshermanPete Member Posts: 5
edited December 22 in Radiant Heating

Starting this morning I noticed that the heat was down a few degrees and checked on the boiler.

On the Control Snapshot screen it displayed:

Lockout 109: Ignition failure occurred

Alert 448: Flame too low

Alert 293: Abnormal recycle, Flame was lost early in run

Alert 291: Abnormal recycle, Flame was not on at end of ignition period

Alert 449: Modulation rate was limited due to flame strength

I originally thought this was due to a dirty flame sensor so I cleaned it with steel wool and it fired up normally. I also cleaned the condensate drain for good measure. When I returned home this evening the lockout 109 and alerts 291/449 were present.

I cleared the lockout and alerts and it's been working fine for the last 4 hours, but it's clear I need to do some more work.

I'd love to get some input with this situation on likely causes. Hoping it's as simple as a faulty flame rod and I can have it delivered by Tuesday.

(alert 448/449 refers to lockout 138 but that lockout never triggered)

449.jpg
109.jpg

Comments

  • 109A_5
    109A_5 Member Posts: 1,764

    Hello FIshermanPete,

    I'd say much more to check.

    image.png
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    image.png

    https://ntiboilers.com/wp-content/uploads/2018/12/TFT-Series-IO-Manual-2018-09.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
  • Tom_133
    Tom_133 Member Posts: 911

    How old is your igniter? Also, when you cleaned out your condensate did you make sure the line that it connects to was also clean. I just had one like that, a little baffling, I pulled condensate off and after pulling the lid off the top of the HX I started pouring vinegar into the HX and it wasn't coming out the bottom. Shoved a screwdriver up there and sploosh it call came out!

    Just a thought. Could be gas pressure. Lots of things to check!

    Tom
    Montpelier Vt
  • FIshermanPete
    FIshermanPete Member Posts: 5
    edited December 22

    Agree the list is long for things to check with lockout 109, it seemed the combination with the different alerts might narrow it down to a 'most probable' issue.

    The igniter is original. I haven't yet disassembled/cleaned the HX to ensure flow. I focused on the condensate trap to make sure the float/ball was not stuck, was pretty caked with sediment on inspection but is now clean.

    I've subsequently tested the venting, gas valve, and spark generator and found no issues. I do not have access to a manometer to test the gas pressure. I'm willing to buy one if that is a high likely suspect based on the errors.

    Would it be prudent to go ahead and buy a new flame sensor and igniter (as both are original) and install them first before disassembling and cleaning the heat exchanger? I'd prefer to put that task off until spring.

  • 109A_5
    109A_5 Member Posts: 1,764

    You can build a manometer.

    https://youtu.be/tWNFVRvbAqw

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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