Results 1 to 6 of 6
  1. #1
    Join Date
    Dec 2010
    Location
    Toronto, Ontario
    Posts
    10

    CV water heater problems

    I got my gas licence less than a year ago, so I'm quite new to the field. Anyway I work as a service tech. mainly fixing water heaters and some furnaces. Quite often i have problems with CV water heaters. Usually they require thermocouple replacement, but sometimes I get called back, the pilot is off again. I have my routine by now: Check TCO, than Voltage on THC, check if pilot is not to weak or yellow flame, check if the venting is correct, if there is no back-spill. Even if everything works OK, still in some locations there are repeated calls for no hot water. Am I missing something?

  2. #2
    Join Date
    Nov 2001
    Location
    Moose Jaw, Saskatchewan, Canada Occupation:Interprovincial Plumber, Commercial Gasfitter Interests:
    Posts
    2,414
    Very seldom is a t-couple in a water heater bad. If it is going out, check the fvr screen. Usually it is dirty and needs cleaning.
    I love my job, but paydays Thursday

  3. #3
    Join Date
    Dec 2010
    Location
    Toronto, Ontario
    Posts
    10
    I was told thermocouple, even if it's new, but bent might give trouble. I check and clean screens too. Would a draft extinguish pilot?

  4. #4
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,281
    Thread relocated to "Tech to Tech"

  5. #5
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,392
    its stupid how they put these thermocouples. They use a LP orifice for all models. and they put the thermocouple under the flame. So dumb, the thermocouple should be in the flame, not the flame lifting off of it.

    sometimes you gotta get creative with pilots. draft hoods are dangerous(barometric dampers are the correct way), look into a starkap.

    maybe you have spillage and your not trained to see it. this could cause the floor to fill up with co2 which snuffs out the pilot.

    i think your doing everything you can. look into some combustion training and you will never have trouble with another pilot call

  6. #6
    Join Date
    Dec 2010
    Location
    Toronto, Ontario
    Posts
    10
    I talked to another service tech, he told me that TCO could cause problems even if it doesn't trip. To me it is an on/off switch, nothing in between. He says that it could develop some resistance over time and cause pilot to go out. Any thoughts?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event