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Low voltage circuit problem. Thermostat works, zone valve works, no call for heat.

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donaldmc
donaldmc Member Posts: 35
edited April 2017 in Gas Heating
But if I jump the TT in the Hydrostat the boiler fires up!?
I replaced the zone valve motor, checked all the low voltage wire nut connections(also soldered them), I have 24V at the transformer, the thermostat is working -every thing is fine for 2 to 3 days then the same problem again. I'm perplexed!
This is my third call to this unit for this same problem. Any help would be a blessing!
6 month old Biasi boiler with a NX burner, Hydrostat 3250-plus, Taco cirulator and zone valve.

Comments

  • megajennyposts
    megajennyposts Member Posts: 4
    Getting help with the thermostat. Thanks for the installation method.
    donaldmc
  • donaldmc
    donaldmc Member Posts: 35
    edited April 2017
    Problem solved! Called the Hydrostat people-swapped it out- fixed. Still under warranty so I don't have to pay! All's well that ends well......the end switch in the zone valve was bad too. Hence the problem trying to diagnosis it.
  • Steamhead
    Steamhead Member Posts: 17,886
    Which Taco model zone valve?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • donaldmc
    donaldmc Member Posts: 35
    Honeywell 24v zone valve model #v8043e. The end switch was working intermittently, make diagnosis difficult.
  • Steamhead
    Steamhead Member Posts: 17,886
    OK- that has a completely isolated end switch. Some Taco and B&G ZVs (and possibly others) do not, and if hooked up wrong they can burn out transformers.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • donaldmc
    donaldmc Member Posts: 35
    Thanks for the info!
  • rick in Alaska
    rick in Alaska Member Posts: 1,493
    Why did they replace the aquastat if it was the end switch on the zone valve? Are we missing something else?
    Rick
    Steve Minnich
  • Steve Minnich
    Steve Minnich Member Posts: 2,868
    Agree w @rick in Alaska. Jumping TT on the aquastat brought the boiler on.
    Steve Minnich
  • donaldmc
    donaldmc Member Posts: 35
    The Hydrostat 3250 plus was giving a "code" when energized -I do not remember what it was- I was told by the tech at Hydrolevel to replace it. No cost, still under warranty.
    Installed replacement - no code when turned on...

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