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Bradford White TTW problem

Saggs
Saggs Member Posts: 174
in THE MAIN WALL
Got a customer with a 40 gallon Bradford White TTW -LP it's the newer style with a honeywell smart-valve and HSI. It's not the newest type with the sealed burner chamber. Anyway, they keep having problems w/ the main burner not coming on. The pilot will light but then the check it and the main burner is not on. The main could be trying to light but fails and times out? I cleaned the sensor, checked the outlet ground and polarity all looks good. Pilto flame is large and blue,covering the sensor. I couldn't get it to fail it is intermittent. Any Ideas? Thx in advance.-Saggs

Comments

  • Ed_26
    Ed_26 Member Posts: 284
    hwt

    Power vented? press.sw.not making?
  • Saggs
    Saggs Member Posts: 174


    Yes, it is power vented and the presssure switch is making, I don't believe the pilot will even come on if the switch isn't proved.
  • Dale
    Dale Member Posts: 1,317
    microamps

    You need to get the adapter to check the microamp flame signal and compare it to the minimum. Since these are regular plug in connection you need to make sure what it plugs into is on it's own circuit and properly grounded. An extension cord setup can have a bad ground or the conduit bad as far as a ground for microamps.
  • Saggs
    Saggs Member Posts: 174


    Dale, do you have a reading or spec for microamps on the flame sensor? The unit has run fine for 2 yrs and is now acting up. Could another load or appliance on the same circuit cause problems?
  • Mitch_4
    Mitch_4 Member Posts: 955
    try

    rocking the molex plug where the ignitor / sensor plugs into the valve. Earlier generations of the "smart" valve had the plug 90° from thee HSI / sensor and werwe notorious for the board cracking. If you wiggle the plug and it lights / drops out, its the valve. replace it and use one where the plugs are side by side
  • Unknown
    Unknown
    Depending on whether

    it is a Generation I or II as to minimum microamps. Gen I is a minimum of .3 and Gen II is 1.3. Normal is around 3 to 5 microamps.

    It is usually necessary to have a special harness to test microamps on SmartValve. You can however determine if perhaps there is a sensing problem by observing the igniter, if the pilot is lit and the igniter keeps glowing you have a sensing problem. If however the pilot is lit and the igniter is "out" the problem is the valve.

    The igniter sensor can be changed however with out changing the entire pilot. The number for the Igniter Assembly from Honeywell is Q3400A-1008
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